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NBS SPECIAL PUBLICATION 260-108

U.S. DEPARTMENT OF COMMERCE/National Bureau of Standards

QC

100

U57

260-108

1987

Standard Reference Materials:

Summary of Gas Cylinder

and Permeation Tube

Standard Reference Materials

Issued by the

National Bureau of Standards

R. Mavrodineanu and T. E. Gills
m he National Bureau of Standards' was established by an act of Congress on March 3, 1901. The Bureau's overall

goal i s t0 strengthen and advance the nation's science and technology and facilitate their effective application for

public benefit. To this end, the Bureau conducts research to assure international competitiveness and leadership of U.S.

industry, science arid technology. NBS work involves development and transfer of measurements, standards and related

science and technology, in support of continually improving U.S. productivity, product quality and reliability, innovation

and underlying science and engineering. The Bureau's technical work is performed by the National Measurement

Laboratory, the National Engineering Laboratory, the Institute for Computer Sciences and Technology, and the Institute

for Materials Science and Engineering.

The National Measurement Laboratory

Provides the national system of physical and chemical measurement;

coordinates the system with measurement systems of other nations and

furnishes essential services leading to accurate and uniform physical and

chemical measurement throughout the Nation's scientific community,

industry, and commerce; provides advisory and research services to other

Government agencies; conducts physical and chemical research; develops,

produces, and distributes Standard Reference Materials; provides

calibration services; and manages the National Standard Reference Data

System. The Laboratory consists of the following centers:

• Basic Standards2

• Radiation Research

• Chemical Physics

• Analytical Chemistry

The National Engineering Laboratory

Provides technology and technical services to the public and private sectors

to address national needs and to solve national problems; conducts research

in engineering and applied science in support of these efforts; builds and

maintains competence in the necessary disciplines required to carry out this research and technical service; develops engineering data and measurement

capabilities; provides engineering measurement traceability services;

develops test methods and proposes engineering standards and code

changes; develops and proposes new engineering practices; and develops

and improves mechanisms to transfer results of its research to the ultimate

user. The Laboratory consists of the following centers:

• Applied Mathematics

• Electronics and Electrical

Engineering2

• Manufacturing Engineering

• Building Technology

• Fire Research

• Chemical Engineering3

The Institute for Computer Sciences and Technology

Conducts research and provides scientific and technical services to aid

Federal agencies in the selection, acquisition, application, and use of

computer technology to improve effectiveness and economy in Government

operations in accordance with Public Law 89-306 (40 U.S.C. 759),

relevant Executive Orders, and other directives; carries out this mission by

managing the Federal Information Processing Standards Program,

developing Federal ADP standards guidelines, and managing Federal

participation in ADP voluntary standardization activities; provides scientific

and technological advisory services and assistance to Federal agencies; and

provides the technical foundation for computer-related policies of the

Federal Government. The Institute consists of the following divisions:

Information Systems Engineering

Systems and Software

Technology

Computer Security

Systems and Network

Architecture

Advanced Computer Systems

The Institute for Materials Science and Engineering

Conducts research and provides measurements, data, standards, reference

materials, quantitative understanding and other technical information

fundamental to the processing, structure, properties and performance of

materials; addresses the scientific basis for new advanced materials

technologies; plans research around cross-cutting scientific themes such as nondestructive evaluation and phase diagram development; oversees Bureau-wide technical programs in nuclear reactor radiation research and

nondestructive evaluation; and broadly disseminates generic technical

information resulting from its programs. The Institute consists of the

following Divisions:

• Ceramics

• Fracture and Deformation3

• Polymers

• Metallurgy

Reactor Radiation

'Headquarters and Laboratories at Gaithersburg, MD, unless otherwise noted; mailing address

Gaithersburg, MD 20899.

2Some divisions within the center are located at Boulder, CO 80303.

'Located at Boulder, CO, with some elements at Gaithersburg, MD
u^7

Standard Reference Materials:

Summary of Gas Cylinder

and Permeation Tube

Standard Reference Materials

Issued by the

National Bureau of Standards

R. Mavrodineanu

Center for Analytical Chemistry

T. E. Gills

Office of Standard Reference Materials

National Bureau of Standards

Gaithersburg, Maryland 20899

U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary

NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director

Issued May 1987
Library of Congress Catalog Card Number: 87-619817

National Bureau of Standards Special Publication 260-108

Natl. Bur. Stand. (U.S.), Spec. Publ. 260-108, 233 pages (May 1987)

CODEN:XNBSAV

U.S. GOVERNMENT PRINTING OFFICE

WASHINGTON: 1987

For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402-9325
Preface

Standard Reference Materials (SRM's) as defined by the National Bureau

of Standards (NBS) are well -characterized materials, produced in quantity and

certified for one or more physical or chemical properties. They are used to

assure the accuracy and compatibility of measurements throughout the Nation.

SRM's are widely used as primary standards in many diverse fields in science,

industry, and technology, both within the United States and throughout the

world. They are also used extensively in the fields of environmental and

clinical analysis. In many applications, traceability of quality control and

measurement processes to the national measurement system is carried out

through the mechanism and use of SRM's. For many of the Nation's scientists

and technologists, it is therefore of more than passing interest to know the

details of the measurements made at NBS in arriving at the certified values

of the SRM's produced. An NBS series of papers, of which this publication is

a member, called the NBS Special Publication - 260 Series , is reserved for

this purpose

.

The 260 Series is dedicated to the dissemination of information on

different phases of the preparation, measurement, certification, and use of

NBS SRM's. In general, much more detail will be found in these papers than

is generally allowed, or desirable, in scientific journal articles. This

enables the user to assess the validity and accuracy of the measurement

processes employed, to judge the statistical analysis, and to learn details

of techniques and methods utilized for work entailing greatest care and

accuracy. These papers also should provide sufficient additional information

not found on the certificate so that new applications in diverse fields not

foreseen at the time the SRM was originally issued will be sought and found.

Inquiries concerning the technical content of this paper should be

directed to the author(s) . Other questions concerned with the availability,

delivery, price, and so forth, will receive prompt attention from:

Office of Standard Reference Materials

National Bureau of Standards

Gaithersburg, MD 20899

Stanley D. Rasberry, Chief

Office of Standard Reference Materials

iii
Seward, R. W., ed., NBS Standard Reference

Materials Catalog 1986-87, NBS Spec. Publ. 260

SN0O3-O03-O2558-5. (June 1986)

Michaelis, R. E., and Wyman, L. L. Standard

Reference Materials: Preparation of White Cast

Iron Spectrochemical Standards, NBS Misc. Publ. 260-1 (June 1964). COM74-11061**

Michaelis, R. E., Wyman, L. L., and Flitsch, R., Standard Reference Materials: Preparation of NBS

Copper-Base Spectrochemical Standards, NBS

Misc. Publ. 260-2 (October 1964).

COM74- 11063**

Michaelis, R. E., Yakowitz, H., and Moore, G. A.,

Standard Reference Materials: Metallographic

Characterization of an NBS Spectrometric LowAlloy Steel Standard, NBS Misc. Publ. 260-3

(October 1964). COM74-11060**

Hague, J. L., Mears, T. W., and Michaelis, R. E., Standard Reference Materials: Sources of Information, NBS Misc. Publ. 260-4 (February 1965). (See

NBS Spec. Publ. 260-57.)

Alvarez, R., and Flitsch R., Standard Reference

Materials: Accuracy of Solution X-Ray Spectrometric Analysis of Copper-Base Alloys, NBS Misc.

Publ. 260-5 (March 1965). PB168068**

Shultz, J. I., Standard Reference Materials: Methods

for the Chemical Analysis of White Cast Iron Standards, NBS Misc. Publ. 260-6 (July 1965).

COM74-11068**

Bell, R. K., Standard Reference Materials: Methods

for the Chemical Analysis of NBS Copper-Base

Spectrochemical Standards, NBS Misc. Publ. 260-7

(October 1965). COM74-11067**

Richmond, M. S., Standard Reference Materials: Analysis of Uranium Concentrates at the National Bureau of Standards, NBS Misc. Publ. 260-8

(December 1965). COM74-11066**

Anspach, S. C, Cavallo, L. M., Garfinkel, S. B., Hutchinson, J. M. R., and Smith, C. N., Standard

Reference Materials: Half Lives of Materials Used

in the Preparation of Standard Reference Materials

of Nineteen Radioactive Nuclides Issued by the National Bureau of Standards, NBS Misc. Publ. 260-9 (November 1965). COM74-11065**

Yakowitz, H., Vieth, D. L., Heinrich, K. F. J., and

Michaelis, R. E., Standard Reference Materials: Homogeneity Characterization of NBS Spectrometric Standards II: Cartridge Brass and Low-Alloy

Steel, NBS Misc. Publ. 260-10 (December 1965).

COM74-11064**

Napolitano, A., and Hawkins, E. G., Standard

Reference Materials: Viscosity of Standard LeadSilica Glass, NBS Misc. Publ. 260-11 (November

1966).

Yakowitz, H., Vieth, D. L., and Michaelis, R. E., Standard Reference Materials: Homogeneity

Characterization of NBS Spectrometric Standards

UI: White Cast Iron and Stainless Steel Powder

Compact, NBS Misc. Publ. 260-12 (September

1966).

Spijkerman, J. L., Snediker, D. K., Ruegg, F. C, and

DeVoe, J. R., Standard Reference Materials: Mossbauer Spectroscopy Standard for the Chemical

Shift of Iron Compounds, NBS Misc. Publ. 260-13

(July 1967)

Menis, O., and Sterling, J. T., Standard Reference

Materials: Determination of Oxygen in Ferrous

Materials - SRM 1090, 1091, and 1092, NBS Misc.

Publ. 260-14 (September 1966).

Passaglia, E., and Shouse, P. J., Standard Reference

Materials: Recommended Method of Use of

Standard Light-Sensitive Paper for Calibrating

Carbon Arcs Used in Testing Textiles for Colorfastness to Light, NBS Misc. Publ. 260-15 (June

1967). (Replaced by NBS Spec. Publ. 260-41.)

Yakowitz, H., Michaelis, R. E., and Vieth, D. L., Standard Reference Materials: Homogeneity

Characterization of NBS Spectrometric Standards

IV: Preparation and Microprobe Characterization

of W-20% Mo Alloy Fabricated by Powder Metallurgical Methods, NBS Spec. Publ. 260-16 (January

1969). COM74-11062**

Catanzaro, E. J., Champion, C. E., Garner, E. L., Marinenko, G., Sappenfield, K. M., and Shields,

W. R., Standard Reference Materials: Boric Acid;

Isotopic and Assay Standard Reference Materials,

NBS Spec. Publ. 260-17 (February 1970). Out of

Print.

Geller, S. B., Mantek, P. A., and Cleveland, N. G.,

Standard Reference Materials: Calibration of NBS

Secondary Standard Magnetic Tape (Computer

Amplitude Reference) Using the Reference Tape

Amplitude Measurement "Process A," NBS Spec.

Publ. 260-18 (November 1969). (See NBS Spec.

Publ. 260-29.)

Paule, R. C, and Mandel, J., Standard Reference

Materials: Analysis of Interlaboratory Measurements on the Vapor Pressure of Gold (Certification

of Standard Reference Material 745). NBS Spec.

Publ. 260-19 (January 1970). PB190071**

R. C, and Mandel, J., Standard Reference Materials: Analysis of Interlaboratory Measurements on the Vapor Pressures of Cadmium and Silver, NBS

Spec. Publ. 260-21 (January 1971). COM74-

11359**

Yakowitz, H., Fiori, C. E., and Michaelis, R. E., Standard Reference Materials: Homogeneity

Characterization of Fe-3 Si Alloy, NBS Spec. Publ. 260-22 (February 1971). COM74-11357**

Napolitano, A., and Hawkins, E. G., Standard

Reference Materials: Viscosity of a Standard

Borosilicate Glass, NBS Spec. Publ. 260-23

(December 1970). COM71-00157**

Sappenfield, K. M., Marinenko, G., and Hague, J. L., Standard Reference Materials: Comparison of

Redox Standards, NBS Spec. Publ. 260-24 (January

1972). COM72-50058**

iv
Hicho, G. E., Yakowitz, H., Rasberry, S. D., and

Michaelis, R. E., Standard Reference Materials: A

Standard Reference Material Containing Nominally

Four Percent Austenite, NBS Spec. Publ. 260-25

(February 1971). COM74-11356**

Martin, J. F., Standard Reference Materials: National Bureau of Standards-US Steel Corporation Joint Program for Determining Oxygen and Nitrogen in

Steel, NBS Spec. Publ. 260-26 (February 1971). 85

cents* PB 81176620

Garner, E. L., Machlan, L. A., and Shields, W. R., Standard Reference Materials: Uranium Isotopic

Standard Reference Materials, NBS Spec. Publ. 260-27 (April 1971). COM74-11358**

Heinrich, K. F. J., Myklebust, R. L., Rasberry, S. D.,

and Michaelis, R. E., Standard Reference

Materials: Preparation and Evaluation of SRM's

481 and 482 Gold-Silver and Gold-Copper Alloys

for Microanalysis, NBS Spec. Publ. 260-28

(August 1971). COM71-50365**

Geller, S. B., Standard Reference Materials: Calibration of NBS Secondary Standard Magnetic Tape

(Computer Amplitude Reference) Using the Reference Tape Amplitude Measurement "Process A-Model 2," NBS Spec. Publ. 260-29 (June 1971).

COM71-50282

Gorozhanina, R. S., Freedman, A. Y., and

Shaievitch, A. B. (translated by M. C. Selby), Stan- dard Reference Materials: Standard Samples Issued

in the USSR (A Translation from the Russian), NBS

Spec. Publ. 260-30 (June 1971). COM71-50283**

Hust, J. G., and Sparks, L. L., Standard Reference

Materials: Thermal Conductivity of Electrolytic Iron SRM 734 from 4 to 300 K, NBS Spec. Publ. 260-31 (November 1971). COM71-50563**

Mavrodineanu, R., and Lazar, J. W., Standard

Reference Materials: Standard Quartz Cuvettes for High Accuracy Spectrophotometry, NBS Spec.

Publ. 260-32 (December 1973). 55 cents* SN003-003-01213-1

Wagner, H. L., Standard Reference Materials: Comparison of Original and Supplemental SRM

705, Narrow Molecular Weight Distribution Polystyrene, NBS Spec. Publ. 260-33 (May 1972).

COM72-50526**

Sparks, L. L., and Hust, J. G., Standard Reference

Materials: Thermoelectric Voltage, NBS Spec.

Publ. 260-34 (April 1972). COM72-50371**

Sparks, L. L., and Hust, J. G., Standard Reference

Materials: Thermal Conductivity of Austenitic

Stainless Steel, SRM 735 from 5 to 280 K, NBS

Spec. Publ. 260-35 (April 1972.) 35 cents* COM72-50368**

Cali, J. P., Mandel, J., Moore, L. J., and Young, D.

S., Standard Reference Materials: A Referee

Method for the Determination of Calcium in Serum,

NBS SRM 915, NBS Spec. Publ. 260-36 (May

1972). COM72-50527**

Shultz, J. I., Bell., R. K., Rains, T. C, and Menis,

O., Standard Reference Materials: Methods of Analysis of NBS Clay Standards, NBS Spec. Publ. 260-

37 (June 1972). COM72-50692**

Richmond, J. C, and Hsia, J. J., Standard Reference

Materials: Preparation and Calibration of Standards

of Spectral Specular Reflectance, NBS Spec. Publ. 260-38 (May 1972). COM72-50528**

Clark, A. F., Denson, V. A., Hust, J. G., and Powell, R. L., Standard Reference Materials: The Eddy

Current Decay Method for Resistivity Characterization of High-Purity Metals, NBS Spec. Publ. 260-39 (May 1972). COM72-50529**

McAdie, H. G., Garn, P. D., and Menis, O., Standard

Reference Materials: Selection of Thermal Analysis

Temperature Standards Through a Cooperative

Study (SRM 758, 759, 760), NBS Spec. Publ. 260-40 (August 1972) COM72-50776**

Wood, L. A., and Shouse, P. J., Standard Reference

Materials: Use of Standard Light-Sensitive Paper

for Calibrating Carbon Arcs Used in Testing

Textiles for Colorfastness to Light, NBS Spec.

Publ. 260-41 (August 1972) COM72-50775**

Wagner, H. L. and Verdier, P. H., eds., Standard

Reference Materials: The Characterization of

Linear Polyethylene, SRM 1475, NBS Spec. Publ. 260-42 (September 1972). COM72-50944**

Yakowitz, H., Ruff, A. W., and Michaelis, R. E., Standard Reference Materials: Preparation and

Homogeneity Characterization of an Austenitic Iron-Chromium-Nickel Alloy, NBS Spec. Publ. 260-43 (November 1972). COM73-50760**

Schooley, J. F., Soulen, R. J., Jr., and Evans, G. A.,

Jr., Standard Reference Materials: Preparation and

Use of Superconductive Fixed Point Devices, SRM

767, NBS Spec. Publ. 260-44 (December 1972).

COM73-50037**

Greifer, B., Maienthal, E. J., Rains, T. C, and

Rasberry, S. D., Standard Reference Materials: Powdered Lead-Based Paint, SRM 1579, NBS

Spec. Publ. 260-45 (March 1973). COM73-

50226**

Hust, J. G., and Giarratano, P. J., Standard Reference

Materials: Thermal Conductivity and Electrical

Resistivity Standard Reference Materials: Austenitic Stainless Steel, SRM's 735 and 798,

from 4 to 1200 K, NBS Spec. Publ. 260-46 (March

1975). SN003-003-01278-5*

Hust, J. G., Standard Reference Materials: Electrical

Resistivity of Electrolytic Iron, SRM 797, and

Austenitic Stainless Steel, SRM 798, from 5 to 280

K, NBS Spec. Publ. 260-47 (February 1974).

COM74-50176**

Mangum, B. W., and Wise, J. A., Standard Reference

Materials: Description and Use of Precision

Thermometers for the Clinical Laboratory, SRM

933 and SRM 934, NBS Spec. Publ. 260-48 (May

1974). 60 cents* SN003-003-01278-5

Carpenter, B. S., and Reimer, G. M., Standard

Reference Materials: Calibrated Glass Standards for Fission Track Use, NBS Spec. Publ. 260-49

(November 1974). COM74-51185

v
Hust, J. G., and Giarratano, P. J., Standard Reference

Materials: Thermal Conductivity and Electrical

Resistivity Standard Reference Materials: Electrolytic Iron, SRM's 734 and 797 from 4 to 1000 K,

NBS Spec. Publ. 260-50 (June 1975). $1.00*

SN003-003-0 1425-7

Mavrodineanu, R., and Baldwin, J. R., Standard

Reference Materials: Glass Filters As a Standard

Reference Material for Spectrophotometry—Selection, Preparation, Certification, Use-SRM 930,

NBS Spec. Publ. 260-51 (November 1975). $1.90*

SN003-003-01481-8

Hust, J. G., and Giarratano, P. J., Standard Reference

Materials: Thermal Conductivity and Electrical

Resistivity Standard Reference Materials 730 and

799, from 4 to 3000 K, NBS Spec. Publ. 260-52

(September 1975). $1.05* SN003-003-0 1464-8

Durst, R. A., Standard Reference Materials: Standardization of pH Measurements, NBS Spec.

Publ. 260-53 (December 1975, Revised). $1.05

SN003-003-01551-2

Burke, R. W., and Mavrodineanu, R., Standard

Reference Materials: Certification and Use of

Acidic Potassium Dichromate Solutions as an

Ultraviolet Absorbance Standard, NBS Spec. Publ. 260-54 (August 1977). $3.00* SN003-003-0 1828-7

Ditmars, D. A., Cezairliyan, A., Ishihara, S., and

Douglas, T. B., Standard Reference Materials: Enthalpy and Heat Capacity; Molybdenum SRM

781, from 273 to 2800 K, NBS Spec. Publ. 260-55

(September 1977). $2.20* SN003-003-01836-8

Powell, R. L., Sparks, L. L., and Hust, J. G.,

Standard Reference Materials: Standard Thermocouple Materials, Pt.67: SRM 1967, NBS Spec.

Publ. 260-56 (February 1978). $2.20*

SN003-003-01 886-4

Cali, J. P., and Plebanski, T., Standard Reference

Materials: Guide to United States Reference

Materials, NBS Spec. Publ. 260-57 (February

1978). $2.20* PB 277173

Barnes, J. D., and Martin, G. M., Standard Reference

Materials: Polyester Film for Oxygen Gas

Transmission Measurements SRM 1470, NBS

Spec. Publ. 260-58 (June 1979) $2.00* SN003-003-

02077

Chang, T., and Kahn, A. H., Standard Reference

Materials: Electron Paramagnetic Resonance

Intensity Standard; SRM 2601, NBS Spec. Publ. 260-59 (August 1978) $2.30* SN003-003-01975-5

Velapoldi, R. A., Paule, R. C, Schaffer, R., Mandel,

J., and Moody, J. R., Standard Reference

Materials: A Reference Method for the Determination of Sodium in Serum, NBS Spec. Publ. 260-60

(August 1978). $3.00* SN003-003-01978-0

Verdier, P. H., and Wagner, H. L., Standard

Reference Materials: The Characterizationof Linear

Polyethylene (SRM 1482, 1483, 1484), NBS Spec.

Publ. 260-61 (December 1978). $1.70*

SN003-003-02006-1

Soulen, R. J., and Dove, R. B., Standard Reference

Materials: Temperature Reference Standard for Use

Below 0.5 K (SRM 768), NBS Spec. Publ. 260-62

(April 1979). $2.30* SN003-003-02047-8

Velapoldi, R. A., Paule, R. C, Schaffer, R., Mandel,

J., Machlan, L. A., and Gramlich, J. W., Standard

Reference Materials: A Reference Method for the Determination of Potassium in Serum, NBS Spec.

Publ. 260-63 (May 1979). $3.75* SN003-003-

02068

Velapoldi, R. A., and Mielenz, K. D., Standard

Reference Materials: A Fluorescence Standard

Reference Material Quinine Sulfate Dihydrate

(SRM 936), NBS Spec. Publ. 260-64 (January

1980) . $4.25* SNO03-OO3-O2 148-2

Marinenko, R. B., Heinrich, K. F. J., and Ruegg,

F. C, Standard Reference Materials: MicroHomogeneity Studies of NBS Standard Reference

Materials, NBS Research Materials, and Other

Related Samples, NBS Spec. Publ. 260-65

(September 1979). $3.50* SN003-003-02 114-1 Venable, W. H., Jr., and Eckerle, K. L., Standard

Reference Materials: Didymium Glass Filters for Calibrating the Wavelength Scale of Spectrophotometers-SRM 2009, 2010, 2013, and 2014,

NBS Spec. Publ. 260-66 (October 1979). $3.50*

SN003-003-02 127-0

Velapoldi, R. A., Paule, R. C, Schaffer, R., Mandel,

J., Murphy, T. J., and Gramlich, J. W., Standard

Reference Materials: A Reference Method for the Determination of Chloride in Serum, NBS Spec.

Publ. 260-67 (November 1979). $3.75*

SN003-O03-O2136-9

Mavrodineanu, R., and Baldwin, J. R., Standard

Reference Materials: Metal-On-Quartz Filters as a Standard Reference Material for Spectrophotometry

SRM 2031, NBS Spec. Publ. 260-68 (April 1980).

$4.25* SN003-003-02 167-9

Velapoldi, R. A., Paule, R. C, Schaffer, R., Mandel,

J., Machlan, L. A., Garner, E. L., and Rains, T. C, Standard Reference Materials: A Reference

Method for the Determination of Lithium in Serum,

NBS Spec. Publ. 260-69 (July 1980). $4.25*

SN003-003-02214-4

Marinenko, R. B., Biancaniello, F., Boyer, P. A.,

Ruff, A. W., and DeRobertis, L., Standard

Reference Materials: Preparation and Characterization of an Iron-Chromium-Nickel Alloy for Microanalysis, NBS Spec. Publ. 260-70 (May

1981) . $2.50* SN003-003-02328-1 , Seward, R. W., and Mavrodineanu, R., Standard

Reference Materials: Summary of the Clinical Laboratory Standards Issued by the National Bureau

of Standards, NBS Spec. Publ. 260-71 (November

1981). $6.50* SN003-O03-O2381-7

Reeder, D. J., Coxon, B., Enagonio, D., Christensen, R. G., Schaffer, R., Howell, B. F., Paule, R. C.and Mandel, J., Standard Reference Materials: SRM 900, Antiepilepsy Drug Level Assay Stan- dard, NBS Spec. Publ. 260-72 (June 1981). $4,25*

SN003-003-02329-9

vi
Interrante, C. G., and Hicho, G. E., Standard

Reference Materials: A Standard Reference

Material Containing Nominally Fifteen Percent

Austenite (SRM 486), NBS Spec. Publ. 260-73

(January 1982). $2.75* SN003-003-02386-8

Marinenko. R. B., Standard Reference Materials: Preparation and Characterization of K-411 and

K-414 Mineral Glasses for Microanalysis: SRM

470, NBS Spec. Publ. 260-74 (April 1982). $3.50

SN003-O03-02395-7

Weidner, V. R., and Hsia, J. J., Standard

Reference Materials: Preparation and Calibration of

First Surface Aluminum Mirror Specular Reflec- tance Standards (SRM 2003a), NBS Spec. Publ. 260-75 (May 1982). $3.75 SNO03-O03-O2399-O

Hicho, G. E., and Eaton, E. E., Standard Reference

Materials: A Standard Reference Material Containing Nominally Five Percent Austenite (SRM 485a),

NBS Spec. Publ. 260-76 (August 1982). $3.50

SN003-0O3-O2433-3

Furukawa, G. T., Riddle, J. L., Bigge, W. G., and

Pfieffer, E. R., Standard Reference Materials: Application of Some Metal SRM's as Thermometric

Fixed Points, NBS Spec. Publ. 260-77 (August

1982) . $6.00 SN003-003-02434-1

Hicho, G. E., and Eaton, E. E., Standard Reference

Materials: Standard Reference Material Containing

Nominally Thirty Percent Austenite (SRM 487),

NBS Spec. Publ. 260-78 (September 1982). $3.75*

SN003-O03-O2435-0

Richmond, J. C, Hsia, J. J., Weidner, V. R., and

Wilmering, D. B., Standard Reference Materials: Second Surface Mirror Standards of Specular

Spectral Reflectance (SRM's 2023 , 2024, 2025),

NBS Spec. Publ. 260-79 (October 1982). $4.50*

SN003-003-02447-3

Schaffer, R., Mandel, J., Sun, T., Cohen, A., and

Hertz, H. S., Standard Reference Materials: Evaluation by an ID/MS Method of the AACC

Reference Method for Serum Glucose, NBS Spec.

Publ. 260-80 (October 1982). $4.75*

SN003-O03-O2443-1

Burke, R. W., and Mavrodineanu, R., Standard

Reference Materials: Accuracy in Analytical Spectrophotometry, NBS Spec. Publ. 260-81 (April

1983) . $6.00* SN003-003-02484-8

Weidner, V. R., Standard Reference Materials: White

Opal Glass Diffuse Spectral Reflectance Standards

for the Visible Spectrum (SRM's 2015 and 2016),

NBS Spec. Publ. 260-82 (April 1983). $3.75*

SN003-003-02489-9**

Bowers, G. N., Jr., Alvarez, R., Cab, J. P., Eberhardt, K. R., Reeder, D. J., Schaffer, R., Uriano, G. A., Standard Reference Materials: The

Measurement of the Catalytic (Activity)

Concentration of Seven Enzymes in NBS Human

Serum SRM 909, NBS Spec. Publ. 260-83 (June

1983). $4.50* SN003-003-02499-6

Gills, T. E., Seward, R. W., Collins, R. J., and

Webster, W. C, Standard Reference Materials: Sampling, Materials Handling, Processing, and

Packaging of NBS Sulfur in Coal Standard

Reference Materials 2682, 2683, 2684, and 2685,

NBS Spec. Publ. 260-84 (August 1983). $4.50*

SNO03-0O3-O2520-8

Swyt, D. A., Standard Reference Materials: A

Look at Techniques for the Dimensional Calibration

of Standard Microscopic Particles, NBS Spec. Publ. 260-85 (September 1983). $5.50*

SN003-003-02521-6

Hicho, G. E. and Eaton, E. E., Standard Reference

Materials: A Standard Reference Material Containing Two and One-Half Percent Austenite, SRM

488, NBS Spec. Publ. 260-86 (December 1983).

$1.75* SN003-003-02541-1

Mangum, B. W., Standard Reference Materials: SRM

1969: Rubidium Triple-Point - A Temperature

Reference Standard Near 39.30 °C, NBS Spec.

Publ. 260-87 (December 1983). $2.25*

SN003-003-02544-5

Gladney, E. Burns, C. E., Perrin, D. R., Roelandts, I., and Gills, T. E., Standard Reference

Materials: 1982 Compilation of Elemental

Concentration Data for NBS Biological, Geological, and Environmental Standard Reference

Materials, Spec. Publ. 260-88 (March 1984).

$7.00* SN003-O03-O2565-8

Hust, J. G., Standard Reference Materials: A FineGrained, Isotropic Graphite for Use as NBS

Thermophysical Property RM's from 5 to 2500 K,

NBS Spec. Publ. 260-89 (September 1984). $4.50*

SN003-O03-O2608-5

Hust, J. G., and Lankford, A. B., Standard Reference

Materials: Update of Thermal Conductivity and

Electrical Resistivity of Electrolytic Iron, Tungsten,

and Stainless Steel, NBS Spec. Publ. 260-90

(September 1984). $3.00* SN003-O03-O26O9-3

Goodrich, L. F., Vecchia, D. F., Pittman, E. S., Ekin,

J. W., and Clark, A. F., Standard Reference

Materials: Critical Current Measurements on an NbTi Superconducting Wire Standard Reference

Material, NBS Spec. Publ. 260-91 (September

1984). $2.75* SN003-003-O2614-0

Carpenter, B. S., Standard Reference Materials: Cali- brated Glass Standards for Fission Track Use

(Supplement to NBS Spec. 260-49), NBS Spec.

Publ. 260-92 (September 1984). $1.50*

SN003-003-02610-7

Ehrstein, J., Standard Reference Materials: Preparation and Certification of Standard Reference

Materials for Calibration of Spreading Resistance

Probes, NBS Spec. Publ. 260-93 (January 1985).

$2.25* SN003-O03-O2633-6

Gills, T. E., Koch, W. F., Stolz, J. W., Kelly, W. R., Paulsen, P. J., Colbert, J. C, Kirklin, D. R., Pei,

P.T.S., Weeks, S., Lindstrom, R. M., Fleming, R.

F., Greenberg, R. R., and Paule, R. C, Standard

Reference Materials: Methods and Procedures Used

at the National Bureau of Standards to Certify Sulfur in Coal SRM's for Sulfur Content, Calorific Value, Ash Content, NBS Spec. Publ. 260-94

(December 1984). $2.25* SN003-O03-O2629-8

vii
Mulholland, G. W., Hartman, A. W., Hembree, G.

G., Marx, E., and Lettieri, T. R., Standard

Reference Materials: Development of a 1 /tm

Diameter Particle Size Standard, SRM 1690, NBS

Spec. Publ. 260-95 (May 1985).

SN003-003-02665-4

Carpenter, B. S., Gramlich, J. W., Greenberg, R. R., Machlan, L. A., DeBievre, P., Eschbach, H. L., Meyer, H., Van Audenhove, J., Connolly, V. E., Trahey, N. M., and Zook, A. C, Standard

Reference Materials: Uranium-235 Isotopic Abundance Standard Reference Materials for Gamma

Spectrometry Measurements, NBS Spec. Publ. 260-

96 (September 1986).

Mavrodineanu, R., and Gills, T. E., Standard

Reference Materials: Summary of the Coal, Ore,

Mineral, Rock, and Refractory Standards Issued by

the National Bureau of Standards, NBS Spec. Publ. 260-97 (September 1985).

Hust, J. G., Standard Reference Materials: Glass

Fiberboard SRM for Thermal Resistance, NBS

Spec. Publ. 260-98 (August 1985).

SNO03-O03-O2674-3

Callanan, J. E., Sullivan, S. A., and Vecchia, D. F., Standard Reference Materials: Feasibility Study for the Development of Standards Using Differential Scanning Calorimetry, NBS Spec. Publ. 260-99

(August 1985). SN003-003-02675-1

Taylor, J. K., Standard Reference Materials: Handbook for SRM Users, NBS Spec. Publ. 260-100

(September 1985).

Mangum, B. W., Standard Reference Materials: SRM

1970, Succinonitrile Triple-Point Standard: A

Temperature Reference Standard Near 58.08 °C,

NBS Spec. Publ. 260-101 (March 1986).

Weidner, V. R., Mavrodineanu, R., Mielenz, K. D.,

Velapoldi, R. A., Eckerle, K. L., and Adams, B., Standard Reference Materials: Holmium Oxide

Solution Wavelength Standard from 240- 650 nm,

SRM 2034, NBS Spec. Publ. 260-102 (July 1986).

viii

Hust, J. G., Standard Reference Materials: Glass

Fiberblanket SRM for Thermal Resistance, NBS

Spec. Publ. 260-103 (September 1985).

SN003-O03-O2687-5

Mavrodineanu, R., and Alvarez, R., Standard

Reference Materials: Summary of the Biological

and Botanical Standards Issued by the National Bureau of Standards, NBS Spec. Publ. 260-104

(November 1985).

Mavrodineanu, R., and Rasberry, S. D., Standard

Reference Materials: Summary of the Environmental Research, Analysis, and Control Standards

Issued by the National Bureau of Standards, NBS

Spec. Publ. 260-105 (March 1986).

Koch, W. F., ed., Standard Reference Materials: Methods and Procedures Used at the National Bureau of Standards to Prepare, Analyze, and Certify SRM 2694, Simulated Rainwater, and Recommendations for Use, NBS Spec. Publ. 260-106 (July

1986).

Hartman, A. W., Standard Reference Materials: SRM

1965, Microsphere Slide (10 /tm Polystyrene

Spheres), NBS Spec. Publ. 260-107 (In Preparation).

* Send order with remittance to Superintendent of

Documents, U.S. Government Printing Office

Washington, DC 20402. Remittance from foreign

countries should include an additional one-fourth of

the purchase price for postage. ** May be ordered from: National Technical Information Services (NTIS), Springfield, Virginia 22161.
TABLE OF CONTENTS

Page

Preface iii

Abstract. x

Introduction 1

Table 1. Category Index of Standard Reference Materials

Available From the National Bureau of Standards 3

Table 2. Summary of the Gas Cylinder Standard Reference

Materials . 7

Table 3. Summary of Permeation Tube Standard Reference

Materials 51

Appendix I. Certificates for the Gas Cylinder

Standard Reference Materials 52

Appendix II. Certificates for the Permeation Tube

Standard Reference Materials 223

Acknowledgement 237

ix
ABSTRACT

This publication is a summary of the gas cylinders and permeation tubes

issued by NBS as Standard Reference Materials (SRM's). The material,

composition, certification, use, and remarks concerning each of the SRM's

described are presented in tabular form. Copies of the certificates of

these SRM's are contained in the appendices for more detailed

information.

Key Words

:

air, benzene, carbon dioxide, carbon monoxide, gas, methane,

nitric oxide, nitrogen, nitrogen dioxide, nitrous oxide, oxygen,

permeation tubes, propane, Standard Reference Materials, sulfur dioxide.

x
INTRODUCTION

Since its inauguration in 1901, the National Bureau of Standards (NBS)

has issued nearly 2,000 different Standard Reference Materials (SRM's).

Many of these have been renewed several times; many have been replaced or

discontinued as technology changes. Today, over 900 SRM's are available,

together with a large number of scientific publications related to the

fundamental and applied characteristics of these materials. Each

material is certified for chemical composition, chemical properties, or

its physical or mechanical characteristics. Each SRM is provided with a

Certificate that contains the essential data concerning its properties or

characteristics. The SRM's currently available cover a wide range of

chemical, physical, and mechanical properties, and a corresponding wide

range of measurement interests in practically all aspects of fundamental

and applied science. These SRM's constitute a unique and invaluable

means of transferring to the user accurate data obtained at NBS , and

provide essential tools that can be used to improve accuracy in

practically all areas where measurements are performed.

In addition to SRM's, the National Bureau of Standards issues a variety

of Reference Materials (RM's). These RM's meet the ISO definition for

RM's, and many meet the definition for CRM's. The documentation issued

with these materials is either of the following:

(1) A "Report of Investigation," for a RM: the sole authority of

which is the author of the report. RM's are intended to further

scientific or technical research on that particular material. The

principle consideration in obtaining a RM is to provide a homogeneous

material so that investigators in different laboratories are assured that

they are investigating the same material.

(2) A "Certificate," for a CRM: issued by the certifying agency

(other than NBS), e.g., other national laboratories, government agencies,

standardizing bodies, or non-profit organizations. When deemed to be in

the public interest and when alternate means of national distribution do

not exist, NBS acts as the distributor for such materials. This service

is available to qualified organizations that have the reference materials

to meet some national measurement need.

The categories of materials available from NBS are given in Table 1.

This table lists these materials according to their chemical composition,

physical properties, or engineering characteristics. A more detailed

description and enumeration of these materials is given in the NBS

Special Publication 260, NBS Standard Reference Materials Catalog, 1986-

87 Edition^. The publication lists every material available from the NBS

Office of Standard Reference Materials.

In addition to these types of materials, NBS provides many additional

services. These include: Measurement Assurance Programs, Calibration

and Related Measurement Services, Proficiency Sample Programs, a National

Voluntary Laboratory Accreditation Program, Standard Reference Data, and

Technical Information and Publications

.

1
Further information on reference materials are available from NBS and may

be obtained from the Office of Standard Reference Materials, National

Bureau of Standards, Gaithersburg, MD 20899. Information on the other

NBS services may be obtained from the Technical Information and

Publications Division, National Bureau of Standards, Gaithersburg, MD

20899.

'-For sale by the Superintendent of Documents, U.S. Government Printing

Office, Washington, DC 20402.

2
Table 1. Categories of Standard Reference Materials Available From

the National Bureau of Standards

.

CERTIFIED CHEMICAL COMPOSITION STANDARDS

Ferrous Alloys

Steels (Chip Form)

Plain Carbon

Low Alloy

Special Low Alloy

High Alloy

Stainless

Tool

Steels (Solid Form)

Low Alloy

Stainless

Specialty

High Temperature

Steelmaking Alloys

Cast Irons (Chip Form)

Cast Steels, White Cast Irons,

Ductile Irons, and Blast

Furnace

Irons (Solid Form)

Nonferrous Alloys

Aluminum-Base Alloys

Copper -Base Alloys (Chip Form)

Copper-Base Alloys (Solid Form)

Copper "Benchmark"

Lead-Base Alloys

Nickel -Base Alloys

Trace Elements in Nickel -Base

Superalloys (Chip Form)

Nickel Oxides (Powder Form)

Titanium-Base Alloys (Chip

Form)

Titanium-Base Alloys (Solid

Form)

Zinc -Base Alloys

Zirconium- Base Alloys

Gases in Metals

High Purity Metals

Microanalytical

Metals for Microanalysis

Mineral Glasses for

Microanalys is

Glasses for Microanalysis

Glass Fibers for Microanalysis

Primary, Working, and Secondary

Chemicals

Microchemicals

Spectrometric Solutions

Clinical Laboratory

Serum Reference Materials

Biological Materials

Food and Beverage

Ethanol Solutions

Agriculture

Environmental Materials

Analyzed Gases

Permeation Devices

Analyzed Liquids and Solids

Simulated Rainwaters

Sulfur in Fossil Fuels

Trace Elements

Organic Constituents

GC/MS System Performance

Industrial Hygiene

Freeze -Dried Urine

Materials on Filter Media

Thin Films for X-ray

Fluorescence

Respirable Quartz

Asbestos

Lubricating Materials

Metallo- Organic Compounds

Catalyst Package for Lubricant

Oxidation

Wear-Metals in Oil

Fertilizers

Ores

Rocks, Minerals, and Refractories

Carbides

Glasses

Cements

Trace Elements

Nuclear Materials

Special Nuclear Materials

Plutonium Assay

Plutonium Isotopic

Uranium Assay

Uranium Isotopic

Special Nuclear Containers

Radiation Dosimetry

Fission Track Glasses

Stable Isotopic Materials

3
PHYSICAL PROPERTIES

Ion Activity

pH

pD

Ion- Selective Electrodes

Metrology

Scanning Electron Microscope

Optical Microscope LinewidthMeasurement

Depth Profiling

Coating Thickness

Nonmagnetic Coating on Magnetic

Substrate

Magnetic Coating on Magnetic

Substrate

Coating Weight

Gold Coating on Glass Sealing

Alloy

Gold Coating on Nickel

Particle, Gamma- ray, and Chemical

Resistance (Durability of

Glass)

Electrical Properties of Glass

Viscosity

Viscosity Fixpoints

Relative Stress Optical

Coefficient

Glass Liquidus Temperature

Elasticity

Density

Microhardness

Ultrasonics

Polymers

Molecular Weight

Heat

Calorimetric

Combustion

Solution

Heat Source

Enthalpy and Heat Capacity

Differential Scanning

Calorimetry

Differential Thermal Analysis

Superconductive Thermometric

Fixed Point Devices

Freezing Point Materials

Defining Fixed Points

Secondary Reference Points

Melting Point Materials

Laboratory Thermometer

Thermocouple Material

Vapor Pressure

Thermal Conductivity

Thermal Expansion

Magnetic

Magnetic Susceptibility

Magnetic Moment

Optical

Spectrophotometrie

Reflectance

Specular Spectral

Reflectance

Directional -Hemispherical

Reflectance

Refractive Index

Optical Rotation

Radioactivity

Alpha-particle, Beta-Glass

Electron- capture Solutions

Alpha-particle Point-Sources

Radiocarbon Dating and Ground

Water Studies

Gaseous Materials

Gamma -ray and X-ray Point

Sources

Low- Energy Photon Point -Sources

Radium- 226 Solutions

Radon Analysis

Gamma- ray Solutions

Rheology

Environmental Natural Matrix

Materials for Traceability

Tests

Radiopharmaceuticals

Special Nuclear Material

Packaging

Metallurgical

Abrasive Wear

Corrosion

Electrochemical Potential and

Thickness

Pitting or Crevice Corrosion

X-ray Fluorescent Emission Target

X-ray Diffraction

Gas Transmission

Reference Fuels

Electrical Resistivity and

Conductivity

Metals

Silicon

Residual Resistivity Ratio

Eddy Current

Superconducting Critical Current

Dye Penetrant Test Blocks

4
ENGINEERING STANDARDS

Standard Rubbers and Rubber

Compounding Materials

Sizing

Particle Size

Cement Turbidimetric and

Fineness

Surface Area

Performance Standards

Socketed Ball Bar

Radiographic Image Quality

Surface Roughness

Color

X-ray and Photographic

Magnetic Computer Storage Media

Centerline Drawings for Optical

Character Recognition

Fire Research

Surface Flammability

Smoke Density Chamber

Flooring Radiant Panel
GAS CYLINDERS AND PERMEATION TUBES

This NBS Special Publication 260, "Summary of the Gas Cylinder and

Permeation Tube Standard Reference Materials Issued by the National

Bureau of Standards," is the fifth volume of a series that is designed to

present to the reader, in a condensed form, the main characteristics of a

number and variety of SRM's available from NBS.

The first volume, NBS SP 260-71 is entitled "Summary of the Clinical

Laboratory Standards Issued by the National Bureau of Standards," and was

issued in 1981. This was followed by the second volume NBS SP 260-97,

"Summary of the Coal, Ore, Mineral, Rock, and Refractory Standards Issued

by the National Bureau of Standards," which was published in 1985. The

next NBS SP 260-104, "Summary of the Biological and Botanical Standards

Issued by the National Bureau of Standards," in 1985 was followed by the

fourth NBS Special Publication 260-105, "Summary of Environmental

Research Analysis and Control Standards Issued by the National Bureau of

Standards," which was published in 1986.

This fifth summary volume in the NBS SP 260 series gives in Tables 2 and

3 essential information concerning the material composition, the

certification parameters, and the uses of various gases, gas mixtures,

and permeation tube SRM's. Under "Remarks," additional data are

provided. All the data and information contained in this table were

extracted from the Certificates of Analysis issued for the included

SRM's. An examination of the table gives the reader a general view, but

for more detailed information, the individual Certificates reproduced in

Appendix I should be consulted as well as any reference cited in each

certificate. The Certificates in Appendix I are arranged in numerical

order. The SRM's listed in the tables include all standards that were in

stock as of January 1, 1986. These SRM's are the result of the concerted

efforts of a number of scientists from the NBS National Measurement

Laboratory, Center for Analytical Chemistry, and from industry. Each

Certificate lists the individuals and laboratories who contributed to the

preparation and certification of the SRM.

6
TABLE 2. SUMMARY OF THE GAS CYLINDER STANDARD

REFERENCE MATERIALS

7
SRM: 1658 (renewals)

Methane in Air.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

Methane in air is supplied in aluminum cylinders at

12.4 MPa (1800 psi) with a volume of 0.88 m

3 (31 cubic

feet) at STP. They conform to DOT (Department of

Transportation) specifications and are equipped with

CGA - 350 valves.

Nominal Concentration: 1 /mole/mole (ppm) , CH4.

Each cylinder is individually analyzed by comparison

with a secondary standard using gas chromatography with

flame -ionization detector.

< 1% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

analysis of methane in air.

The certified values are valid for 2 years from the

date of shipment. The cylinder becomes the property of

the purchaser.

1659 (renewals)

Methane in Air.

Same as SRM 1658.

Nominal concentration: 10 ^mole/mole (ppm), CH4.

Same as SRM 1658.

< 1% relative.

Same as SRM 1658.

Same as SRM 1658.

8
SRMj.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

1660 (renewals)

Methane and Propane in Air.

The gas mixture is supplied in the same manner as for

SRM 1658.

Nominal concentration: 4 jimole/mole (ppm) , CH4; and 1

/jmole/mole (ppm), C3H8.

Same as SRM 1658.

< 1% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used to

differentiate the methane and non-methane fractions of

hydrocarbon in the air.

REMARKS: Same as SRM 1658

SRMl

MATERIAL:

COMPOSITION:

CERTIFICATION:

1661 (renewals)

Sulfur Dioxide in Nitrogen.

Sulfur dioxide in nitrogen is supplied in aluminum

cylinders at 12.4 MPa (1800 psi) with a volume of 0.88

nr> (31 cubic feet) at STP. They conform to DOT

specifications and are equipped with CGA - 660 valves.

Nominal concentration: 500 /xmole/mole (ppm), SO2

.

Each cylinder is individually analyzed by comparison

with a set of NBS primary standards using gas

chromatography with a thermal conductivity detector

and/or a non- dispersive infrared analyzer.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

USEj.

REMARKS:

This SRM is intended primarily for use as a primary

standard to calibrate instruments used for the analysis

of SO2 emitted from stationary sources

.

The certified values are valid for 2 years from the

date of shipment. The cylinder becomes the property of

the purchaser.

9
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

1662 (renewals)

Sulfur Dioxide in Nitrogen.

Same as SRM 1661.

Nominal concentration: 1000 /xmole/mole (ppm) , SO2

Same as SRM 1661.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

USE: Same as 1661.

REMARKS: Same as 1661

1663 (renewals)

Sulfur Dioxide in Nitrogen.

Same as SRM 1661.

Nominal concentration: 1500 /imole/mole (ppm) , SO2

Same as SRM 1661.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

USE: Same as SRM 1661.

REMARKS: Same as SRM 1661.

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

10
MATERIAL:

COMPOSITION:

CERTIFICATION:

1664 (renewals)

Sulfur Dioxide in Nitrogen.

Same as SRM 1661.

Nominal concentration: 2500 /imole/mole (ppm) , SO2

Same as SRM 1661.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

USE:

REMARKS:

Same as SRM 1661

Same as SRM 1661

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

1665 (renewals)

Propane in Air.

Propane in air is supplied in aluminum cylinders at

12.4 MPa (1800 psi) with a volume of 0.88 m

3 (31 cubic

feet) at STP. They conform to DOT specifications and

are equipped with CGA - 350 valves.

Nominal concentration: 3 /imole/mole (ppm), C3H8.

Oxygen content : 20.9 mole percent

.

Each cylinder is individually analyzed by comparison

with gravimetric primary standards using gas

chromatography and flame -ionization detector.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

USEj.

REMARKS:

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

analysis of hydrocarbon in mobile -source emission.

The certified values are valid for 2 years from date of

shipment. The cylinder becomes the property of the

purchaser

.

11
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

1666 (renewals)

Propane in Air.

Same as SRM 1665.

Nominal concentration: 10 /xmole/mole (ppm) , C3H8

Oxygen content: 20.9 mole percent.

Same as SRM 1665.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

USE:

REMARKS:

Same as SRM 1665

Same as SRM 1665

SRM:

MATERIAL:

1667 (renewals)

Propane in Air.

Same as SRM 1665

COMPOSITION:

CERTIFICATION:

Nominal concentration: 50 /imole/mole (ppm) , C3H8

Oxygen content: 20.9 mole percent.

Same as SRM 1665.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

USE:

REMARKS:

Same as SRM 1665

Same as SRM 1665

12
SSUl

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

IZSEj.

REMARKS;

1668 (renewals)

Propane in Air.

Same as SRM 1665.

Nominal concentration: 100 /imole/mole (ppm) , C3H8

Oxygen content: 20.9 mole percent.

Same as SRM 1665.

< 1% relative

Same as SRM 1665

Same as SRM 1665

SBXL

MATERIAL;

COMPOSITION:

CERTIFICATION:

1669 (renewals)

Propane in Air.

Same as SRM 1665.

Nominal concentration: 500 /imole/mole (ppm) , C3H8

Oxygen content: 20.9 mole percent.

Same as SRM 1665.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

USEj.

REMARKS:

Same as SRM 1665

Same as SRM 1665

13
SRM: 1670

Carbon Dioxide in Air.

MATERIAL:

COMPOSITION:

Carbon dioxide in air is supplied in cylinders with a

deliverable volume of about 0.76 (27 cubic feet) at

STP. They conform to DOT specifications and are

equipped with CGA - 580 valves.

Nominal concentration: 330 /imole/mole (ppm) , CO2.

Estimated oxygen: 20.95 mole percent: nitrous oxide:

0.06 ppm by mole N2O. Water vapor: 24 ppm by mole

maximum.

CERTIFICATION: Each cylinder is individually analyzed by comparison

with standards established by gravimetry, using gas

chromatography and/or non- dispersive infrared method.

UNCERTAINTY OF

CERTIFIED VALUE: < 0.06% relative,

USE:

REMARKS

:

This SRM is intended primarily for use as a primary

standard in the calibration of instruments and methods

used for the measurement of C0£ in air.

The certified values are valid for 2 years from the

date of shipment. The gas should not be used as an

analytical standard when the pressure falls below 2.07

MPa (300 psi) . The cylinders become the property of

the purchaser.

SRM: 1671

Carbon Dioxide in Air,

MATERIAL: Same as SRM 1670,

COMPOSITION: Nominal concentration: 340 /imole/mole (ppm), CO2

.

Estimated oxygen: 20.95 mole percent; nitrous oxide:

0.08 ppm by mole N2O; water vapor 24 ppm by mole

maximum.

CERTIFICATION: Same as SRM 1670,

UNCERTAINTY OF

CERTIFIED VALUE: < 0.06% relative,

USE: Same as SRM 1670

REMARKS: Same as SRM 1670,

14
SRM;

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

1672

Carbon Dioxide in Air.

Same as 1670.

Nominal concentration: 350 /^mole/mole (ppm) , CO2.

Estimated oxygen: 20.95 mole percent; nitrous oxide:

0.03 ppm by mole N2O; water vapor 24 ppm by mole

maximum.

Same as SRM 1670.

< 0.06% relative.

Same as SRM 1670.

Same as SRM 1670.

1674 (renewals)

Carbon Dioxide in Nitrogen.

Carbon dioxide in nitrogen is supplied in cylinders at

12.4 MPa (1800 psi) with a deliverable volume of 0.88

m

3 (31 cubic feet) at STP. They conform to DOT

specifications and are equipped with CGA - 580 valves.

Nominal concentration: 7 mole percent, CO2

.

Same as SRM 1670. The method of intercomparison was

gas chromatography using thermal conductivity.

< 1% relative.

Same as SRM 1670.

SRM 1674 should be stored at room temperature and

should not be allowed to experience high or low ambient

temperature. The stability is considered to be

excellent, however, the certified value is valid for

only 2 years from date of shipment. The cylinders

become the property of the purchaser.

15
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

1675 (renewals)

Carbon Dioxide in Nitrogen.

Same as SRM 1674.

Nominal concentration: 14 mole percent, CO2

Same as SRM 1674.

< 1% relative.

Same as SRM 1674.

Same as SRM 1674.

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

1677 (renewals)

Carbon Monoxide in Nitrogen.

Carbon monoxide in nitrogen is supplied in aluminum

cylinders at 12.4 MPa (1800 psi) with a deliverable

volume of 0.88 m

3 (31 cubic feet) at STP. They conform

to DOT specifications and are equipped with CGA - 350

valves

.

Nominal concentration: 10 /imole/mole (ppm) , CO.

Each cylinder is individually analyzed by comparison

with secondary standards using catalytic reduction of

CO with hydrogen. The resulting methane is analyzed

with flame- ionization hydrocarbon analyzer and nondispersive infrared analysis.

< 1% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

analysis of CO in mobile-source emissions.

The certified values are valid for 2 years from the

date of shipment. The cylinders are the property of

the purchaser.

16
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE

:

USE:

REMARKS:

1678 (renewals)

Carbon Monoxide in Nitrogen.

Same as SRM 1677.

Nominal concentration: 50 /imole/mole (ppm) , CO,

Same as SRM 1677.

< 1% relative.

Same as SRM 1677.

Same as SRM 1677.

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

JJSEi

REMARKS:

1679 (renewals)

Carbon Monoxide in Nitrogen.

Same as SRM 1677.

Nominal concentration: 100 /zmole/mole (ppm), CO

Same as SRM 1677.

< 1% relative.

Same as SRM 1677.

Same as SRM 1677.

17
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

1680 (renewals)

Carbon Monoxide in Nitrogen.

Same as SRM 1677.

Nominal concentration: 500 ^mole/mole (ppm) , CO,

Same as SRM 1677.

USE: Same as SRM 1677

REMARKS

:

Same as SRM 1677

SRM: 1681 (renewals)

Carbon Monoxide in Nitrogen.

MATERIAL: Same as SRM 1677.

COMPOSITION: Nominal concentration: 1000 /imole/mole (ppm), CO,

CERTIFICATION: Same as SRM 1677.

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

< 1% relative.

Same as SRM 1677.

Same as SRM 1677.

18
SRM: 1683 (renewals)

Nitric Oxide in Nitrogen.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION :

UNCERTAINTY OF

CERTIFIED VALUE:

USEi

REMARKS:

Nitric oxide in nitrogen is supplied in cylinders with

a deliverable volume of 0.85 m

5 (30 cubic feet) at STP.

They conform to DOT specifications and are equipped

with CGA - 660 valves.

Nominal concentration: 50 /imole/mole (ppm) , NO.

Each cylinder is individually analyzed by comparison

with standards using the chemiluminescent reaction of

NO with ozone. No other oxides of nitrogen were

detected at the 1 percent or less limit.

< 1.5% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

analysis of oxides of nitrogen in mobile -source

emissions

.

The certified values are valid for 2 years from the

date of shipment. The gas should not be used below a

pressure of 2.8 MPa (400 psi) . The cylinder becomes

the property of the purchaser.

1684 (renewals)

Nitric Oxide in Nitrogen.

Same as SRM 1683.

Nominal concentration: 100 /imole/mole (ppm) , NO

Same as SRM 1683.

< 1% relative.

Same as SRM 1683.

Same as SRM 1683.

19
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

1685 (renewals)

Nitric Oxide in Nitrogen.

.

Same as SRM 1683.

Nominal concentration: 250 /imole/mole (ppm) , NO

Same as SRM 1683.

UNCERTAINTY OF

CERTIFIED VALUE: < 1.5% relative,

USE:

REMARKS

Same as SRM 1683

Same as SRM 1683

SRM

:

MATERIAL:

COMPOSITION:

CERTIFICATION:

1686 (renewals)

Nitric Oxide in Nitrogen.

Same as SRM 1683.

Nominal concentration: 500 /mole/mole (ppm) , NO

Same as SRM 1683.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

USE:

REMARKS

Same as SRM 1683

Same as SRM 1683

20
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

1687 (renewals)

Nitric Oxide in Nitrogen.

Same as SRM 1683.

Nominal concentration: 1000 /xmole/mole (ppm) , NO.

Same as SRM 1683.

< 1% relative.

Same as SRM 1683.

REMARKS Same as SRM 1683

SRM: 1693 (renewals)

Sulfur Dioxide in Nitrogen.

MATERIAL

:

Sulfur dioxide in nitrogen is supplied in aluminum

cylinders at 12.4 MPa (1800 psi) with a deliverable

volume of 0.88 m

3 (31 cubic feet) at STP. They conform

to DOT specifications and are equipped with CGA - 660

valves

.

COMPOSITION:

CERTIFICATION:

Nominal concentration: 50 /zmole/mole (ppm), S02-

Each cylinder is individually analyzed by comparison

with NBS primary standards, using gas chromatography

with thermal conductivity detector and/or nondispersive infrared analyzer.

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

< 2% relative.

This SRM is intended primarily for use as a primary

standard to calibrate instruments used for the analysis

of SO2 emitted from stationary sources.

The certified values are valid for 2 years from the

date of shipment. The cylinder becomes the property of

the purchaser.

21
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

1694 (renewals)

Sulfur Dioxide in Nitrogen.

Same as SRM 1693.

Nominal concentration: 100 /imole/mole (ppm) , SO2

Same as SRM 1693.

UNCERTAINTY OF

CERTIFIED VALUE: < 2% relative

USE:

REMARKS:

Same as SRM 1693

Same as SRM 1693

SRM:

MATERIAL:

1696 (renewals)

Sulfur Dioxide in Nitrogen.

Same as SRM 1693.

COMPOSITION: Nominal concentration: 3500 /imole/mole (ppm), SO2

CERTIFICATION: Same as SRM 1693.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

USE:

REMARKS:

Same as SRM 1693

Same as SRM 1693

22
SRMl

MATERIAL:

COMPOSITION:

CERTIFICATION:

1805

Benzene In Nitrogen.

Benzene in nitrogen is supplied in aluminum cylinders

at 12.4 MPa (1800 psi) with a volume of 0.88 m

3 (31

cubic feet) at STP. They conform to DOT specifications

and are equipped with CGA - 350 valves.

Nominal concentration: 0.25 /xmole/mole (ppm) , CgHg

.

Each cylinder is individually analyzed by comparison

with gravimetric standards and with a calibrated

benzene permeation system using gas chromatography and

flame- ionization detector.

UNCERTAINTY OF

CERTIFIED VALUE: < 2% relative

USE:

REMARKS:

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used to

determine CgHg in stationary- source emissions. For

precautions in using this SRM, see Certificate.

The certified values are valid for 2 years from the

date of shipment. The cylinders become the property of

the purchaser.

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

A UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

1806

Benzene in Nitrogen.

Same as SRM 1805.

Nominal concentration: 10 /imole/mole (ppm), CgHg

Same as SRM 1805.

< 1% relative

Same as SRM 1805

Same as SRM 1805

23
SRM: 1808

Tetrachloroethylene in Nitrogen.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

Tetrachloroethylene in nitrogen is supplied in aluminum

cylinders at 12.4 MPa (1800 psi) with a deliverable

volume of 0.72 m

3 (25 cubic feet) at STP. The

cylinders conform to DOT specifications and are

equipped with CGA - 350 valves.

Nominal concentration:

CCL2CCL2 balance N2

.

0.25 /xmole/mole (ppm)

,

Each cylinder was certified by comparison with a set of

gravimetric standards. The intercomparisons were

performed using a gas chromatograph equipped with a

flame- ionization detector.

< 2% relative.

This Standard Reference Material (SRM) is intended for

use in the calibration of instruments used for the

determination of tetrachloroethylene in stationarysource emissions.

The certification of this SRM is considered valid for

only 2 years from the date of shipment. The cylinder

becomes the property of the purchaser.

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

1809

Tetrachloroethylene in Nitrogen.

Same as SRM 1808.

Nominal concentration: 10 /xmole/mole (ppm) , CCL2CCL2

balance N2

.

Same as SRM 1808.

< 2% relative.

Same as SRM 1808.

Same as SRM 1808.

24
MATERIAL:

COMPOSITION:

CERTIFICATION:

1811

Benzene, Toluene, Chlorobenzene , and Bromobenzene

in Nitrogen.

Benzene, Toluene, Chlorobenzene, and Bromobenzene in

Nitrogen is supplied in aluminum cylinders at 12.4 MPa

(1800 psi) with a deliverable volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to DOT

specifications and are equipped with CGA - 350 valves.

Nominal concentration: 0.25 /zmole/mole (ppm) , CgHg,

C6H5CH3, C6H5CL, C6H5Br, balance N2

.

Each cylinder is individually analyzed by comparison to

a set of gravimetric standards. The intercomparisons

were performed using a gas chromatograph equipped with

a flame -ionization detector.

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

<: 2% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

determination of volatile aromatic hydrocarbons

(benzene, toluene, chlorobenzene, and bromobenzene) in

stationary- source emissions.

The certified data are valid within the stated limits

of uncertainty for 2 years from the date of shipment.

The cylinder becomes the property of purchaser.

SRMl

MATERIAL:

COMPOSITION:

CERTIFICATION:

1812

Benzene , Toluene , Chlorobenzene , and Bromobenzene in

Nitrogen.

Same as SRM 1811.

Nominal concentration: 10 /imole/mole (ppm), CgHg

,

C6H5CH3, C6H5CI, CgHsBr, balance N2

.

Same as SRM 1811.

UNCERTAINTY OF

CERTIFIED VALUE: < 1.5% relative

USE:

REMARKS

Same as SRM 1811

Same as SRM 1811

25
SRM; 2607

Carbon Dioxide and Nitrous Oxide in Air.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

Carbon dioxide and nitrous oxide in air is supplied in

aluminum cylinders with a deliverable volume of

approximately 3.82 m

3 (135 cubic feet) at STP. The

cylinders conform to DOT specifications and are

equipped with CGA - 660 valves.

Nominal concentration: 340 /imole/mole (ppm) CO2

;

300 nmole/mole (ppb) N2O balance air.

The carbon dioxide and nitrous oxide contents were

determined by comparison to NBS working standards that

had been previously intercompared with a set of primary

gravimetric standards. The method of intercomparison

was gas chromatography and/or a non-dispersive infrared

spectrometric method for carbon dioxide, and electron

capture -gas chromatography and tunable diode laser

spectroscopy for nitrous oxide.

CO2, < 0.06% relative; N2O, < 1% relative.

As a primary standard for use in the calibration of

instruments and the evaluation of methods used for the

measurement of carbon dioxide and nitrous oxide in the

atmosphere

.

The certified values are valid for 2 years from the

date of shipment from NBS. The cylinders become the

property of purchaser.

2608

Carbon Dioxide and Nitrous Oxide in Air.

Same as SRM 2607 except that the cylinder is smaller

and has a deliverable volume of approximately 0.76 m

(27 cubic feet) at STP.

Same as SRM 2607.

Same as SRM 2607.

CO2, < 0.06% relative; N2O, < 1% relative.

Same as SRM 2607.

Same as SRM 2607.

26
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2609

Carbon Dioxide and Nitrous Oxide in Air.

Same as SRM 2607.

Nominal concentration: 380 /imole/mole (ppm) CO2, 330

nmole/mole (ppb) N2O, balance air.

Same as SRM 2607.

CO2, ^ 0.05% relative; N2O, < 1% relative

Same as SRM 2607.

Same as SRM 2607.

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2610

Carbon Dioxide and Nitrous Oxide in Air.

Same as SRM 2607 except the cylinder is smaller and has

a deliverable volume of approximately 0.76 m^ (27 cubic

feet) at STP.

Same as SRM 2609.

Same as SRM 2607.

CO2, < 0.05% relative; N2O, < 1% relative

Same as SRM 2607.

Same as SRM 2607.

27
SRM: 2612 (renewals)

Carbon Monoxide in Air.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

Carbon monoxide in air is supplied in aluminum

cylinders at 12.4 MPa (1800 psi) with a volume of 0.88

m^ (31 cubic feet) at STP. They conform to DOT

specifications and are equipped with CGA - 350 valves.

Nominal concentration: 10 /imole/mole (ppm) , CO.

Each cylinder is individually analyzed by comparison

with standards related to a set of gravimetric

standards, using non-dispersive infrared technique and

by measurement of methane produced by catalytic

reduction of CO.

2S 1% relative.

As a primary standard in the calibration of instruments

for the analysis of CO in air and as a complement to

SRM's 1677 and 1678.

The certified data are valid for 1 year from date of

shipment. The cylinder becomes the property of the

purchaser.

2613 (renewals)

Carbon Monoxide in Air.

Same as SRM 2612.

Nominal concentration: 20 /imole/mole (ppm), CO.

Same as SRM 2612.

< 1% relative.

Same as SRM 2612.

Same as SRM 2612.

28
SRMl

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE!

REMARKS

2614 (renewals)

Carbon Monoxide in Air.

Same as SRM 2612.

Nominal concentration: 45 /imole/mole (ppm) , CO.

Same as SRM 2612.

< 1% relative.

Same as SRM 2612.

Same as SRM 2612.

2619

Carbon Dioxide in Nitrogen.

Carbon dioxide in nitrogen is supplied in cylinders at

12.4 MPa (1800 psi) with a deliverable volume of 0.88

m

3 (31 cubic feet) at STP. They conform to DOT

specifications and are equipped with CGA - 580 valves.

Nominal concentration: 0.5 mole percent C02-

Each cylinder is individually analyzed by comparison

with standards established in gravimetry, using gas

chromatography with thermal conductivity detector.

< 0.1% relative.

This SRM is intended primarily for use as a primary

standard to determine the fuel efficiency of motor

vehicles

The certified values are valid for 1 year from date of

shipment. This SRM shall be stored at room

temperature. The cylinder becomes the property of the

purchaser

29
SRMl

MATERIAL:

COMPOSITION:

CERTIFICATION:

2620 (renewals)

Carbon Dioxide in Nitrogen.

Same as SRM 2619.

Nominal concentration: 1.0 mole percent CO2

Same as SRM 2619.

UNCERTAINTY OF

CERTIFIED VALUE: < 0.1% relative

USE:

REMARKS

Same as SRM 2619

Same as SRM 2619

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2621 (renewals)

Carbon Dioxide in Nitrogen.

Same as SRM 2619.

Nominal concentration: 1.5 mole percent CO2

Same as SRM 2619.

< 0.1% relative.

Same as SRM 2619.

Same as SRM 2619.

30
MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2622 (renewals)

Carbon Dioxide in Nitrogen.

Same as SRM 2619.

Nominal concentration: 2.0 mole percent CO2

Same as SRM 2619.

< 0.1% relative,

Same as SRM 2619

Same as SRM 2619

SRMl

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2623 (renewals)

Carbon Dioxide in Nitrogen.

Same as SRM 2619.

Nominal concentration: 2.5 mole percent CO2

Same as SRM 2619.

< 0.1% relative.

Same as SRM 2619.

Same as SRM 2619.

31
SRM;

MATERIAL:

COMPOSITION:

CERTIFICATION:

2624 (renewals)

Carbon Dioxide in Nitrogen.

Same as SRM 2619.

Nominal concentration: 3.0 mole percent CO2

Same as SRM 2619.

UNCERTAINTY OF

CERTIFIED VALUE: 5; 0.1% relative.

USE:

REMARKS

Same as SRM 2619

Same as SRM 2619

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2625 (renewals)

Carbon Dioxide in Nitrogen.

Same as SRM 2619.

Nominal concentration: 3.5 mole percent CO2

Same as SRM 2619.

UNCERTAINTY OF

CERTIFIED VALUE: < 0.1% relative

USE:

REMARKS:

Same as SRM 2619

Same as SRM 2619

32
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USEi

REMARKS:

2626 (renewals)

Carbon Dioxide in Nitrogen.

Same as SRM 2619.

Nominal concentration: 4.0 mole percent CO2.

Same as SRM 2619.

< 0.1% relative.

Same as SRM 2619.

Same as SRM 2619.

2627 (renewals)

Nitric Oxide in Nitrogen.

Nitric oxide in nitrogen is supplied in cylinders with

a deliverable volume of 0.85 m^ (30 cubic feet) at STP.

They conform to DOT specifications and are equipped

with CGA - 660 valves.

Nominal concentration: 5 pmole/mole (ppm) , NO.

Each cylinder is individually analyzed by comparison

with standards using the chemiluminescent reaction of

NO with ozone. No other oxides of nitrogen were

detected at the 1 percent or less limit.

<, 2% relative.

This SRM is intended primarily for use as a primary

standard for the calibration of instruments used for

the analysis of oxides of nitrogen in mobile -source

emissions

The certified values are valid for 1 year from date of

shipment. The gas should not be used below a pressure

of 2.8 MPa (400 psi) . The cylinder becomes the

property of the purchaser.

33
SRM;

MATERIAL:

COMPOSITION:

CERTIFICATION:

2628 (renewals)

Nitric Oxide in Nitrogen.

Same as SRM 2627.

Nominal concentration: 10 jimole/mole (ppm) , NO

Same as SRM 2627.

UNCERTAINTY OF

CERTIFIED VALUE: < 2% relative.

USE:

REMARKS:

Same as SRM 2627

Same as SRM 2627

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE: < 2% relative.

2629 (renewals)

Nitric Oxide in Nitrogen.

Same as SRM 2627.

Nominal concentration: 20 /xmole/mole (ppm) , NO

Same as SRM 2627.

USE:

REMARKS:

Same as SRM 2627

Same as SRM 2627

34
SRM: 2630 (renewals)

Nitric Oxide in Nitrogen.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

Same as SRM 2627. The gas is supplied in aluminum

cylinders

Nominal concentration: 1500 /xmole/mole (ppm) , NO.

Same as SRM 2627. The maximum concentration of

nitrogen dioxide does not exceed 0.5% relative to the

NO in the sample.

< 1% relative.

Same as SRM 2627.

The certified values are valid for 2 years from the

date of shipment. The cylinder becomes the property

the purchaser.

2631 (renewals)

Nitric Oxide in Nitrogen.

Same as SRM 2630.

Nominal concentration: 3000 /xmole/mole (ppm), NO.

Same as SRM 2630.

< 1% relative.

Same as SRM 2630.

Same as SRM 2630.

35
2632 (renewals) -

POSSIBLE DISCONTINUANCE

Carbon Dioxide in Nitrogen.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE!

Carbon dioxide in nitrogen is supplied in aluminum

cylinders at 12.4 MPa (1800 psi) with a deliverable

volume of 0.88 m

3 (31 cubic feet) at STP. They conform

to DOT specifications and are equipped with CGA - 580

valves

.

Nominal concentration: 300 /imole/mole (ppm) , CX>2.

Each cylinder is individually analyzed by comparison

with standards established by gravimetry, using

non- dispersive infrared and gas chromatography with

ultrasonic detector techniques

.

< 1% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

determination of carbon dioxide in mobile -source

emissions

.

REMARKS: The certified values are valid for 2 years from the

date of shipment. The cylinder becomes the property of

the purchaser.

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2633 (renewals) -POSSIBLE DISCONTINUANCE

Carbon Dioxide in Nitrogen.

Same as SRM 2632.

Nominal concentration: 400 /imole/mole (ppm), CO2

Same as SRM 2632.

UNCERTAINTY OF

CERTIFIED VALUE: £ 1% relative,

USE: Same as SRM 2632

REMARKS: Same as SRM 2632

36
MATERIAL:

COMPOSITION:

CERTIFICATION:

2634 (renewals^ -- POSSIBLE DISCONTINUANCE

Carbon Dioxide in Nitrogen.

Same as SRM 2632.

Nominal concentration:

Same as SRM 2632.

UNCERTAINTY OF

CERTIFIED VALUE: 2S 1% relative.

REMARKS:

Same as SRM 2632.

Same as SRM 2632.

800 /imole/mole (ppm) , CO2

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE: <, 1% relative.

2635 (renewals)

Carbon Monoxide in Nitrogen.

Carbon monoxide in nitrogen is supplied in aluminum

cylinders at 12.4 MPa (1800 psi) with deliverable

volumes of 0.88 m

3 (31 cubic feet) at STP. They

conform to DOT specifications and are equipped with CGA

- 350 valves.

Nominal concentration: 25 /imole/mole (ppm), CO.

Each cylinder is individually analyzed by comparing

with a batch standard using non- dispersive infrared

and/or gas chromatography techniques

USEj.

REMARKS:

This SRM is intended primarily for use as a primary

standard for the calibration of instruments used for

the determination of carbon monoxide in mobile -source

emissions

The certified values are valid for 2 years from date of

shipment. The cylinders are the property of purchaser.

37
SEHi

MATERIAL:

COMPOSITION:

CERTIFICATION:

2636 (renewals)

Carbon Monoxide in Nitrogen.

Same as SRM 2635.

Nominal concentration: 250 /xmole/mole (ppm) , CO.

Same as SRM 2635.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

USE:

REMARKS

:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

Same as SRM 2635

Same as SRM 2635

2637 (renewals)

Carbon Monoxide in Nitrogen.

Same as SRM 2635.

Nominal concentration: 2500 ^mole/mole (ppm), CO,

Same as SRM 2635.

UNCERTAINTY OF

CERTIFIED VALUE: s£ 1% relative.

HSEl

REMARKS:

Same as SRM 2635

Same as SRM 2635

38
SRM: 2638 (renewals)

Carbon Monoxide in Nitrogen.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

Same as SRM 2635.

Nominal concentration: 5000 /imole/mole (ppm) , CO.

Same as SRM 2635.

^ 1% relative.

Same as SRM 2635.

Same as SRM 2635.

SRML

MATERIAL:

COMPOSITION:

CERTIFICATION:

2639 (renewals)

Carbon Monoxide in Nitrogen.

Same as SRM 2635, except for the valve which for SRM

2639 is a CGA - 580 type.

Nominal concentration:

Same as SRM 2635.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

USEj.

REMARKS:

Same as SRM 2635.

Same as SRM 2635.

1 mole percent CO.

39
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2640 (renewals)

Carbon Monoxide in Nitrogen.

Same as SRM 2639.

Nominal concentration: 2 mole percent,

Same as SRM 2635.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

USE:

REMARKS:

Same as SRM 2635

Same as SRM 2635

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2641 (renewals)

Carbon Monoxide in Nitrogen.

Same as SRM 2639.

Nominal concentration:

Same as SRM 2635.

UNCERTAINTY OF

CERTIFIED VALUE: <, 1% relative.

USE: Same as SRM 2635.

4 mole percent, CO

REMARKS Same as SRM 2635

40
SRM: 2642 (renewals)

Carbon Monoxide in Nitrogen.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE;

REMARKS:

Same as SRM 2639.

Nominal concentration: 8 mole percent, CO.

Same as SRM 2635.

< 1% relative.

Same as SRM 2635.

Same as SRM 2635.

2643 (renewals) -- POSSIBLE DISCONTINUANCE

Propane in Nitrogen.

Propane in nitrogen is supplied in aluminum cylinders

at 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m

3 (31 cubic feet) at STP. They conform to DOT

specifications and are equipped with CGA - 350 valves.

Nominal concentration: 100 /imole/mole (ppm) , C3H8

Each cylinder is individually analyzed by comparison

with gravimetric primary standard, using gas

chromatography with flame- ionization detector.

< 1% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

analysis of hydrocarbon in mobile-source emissions.

The certified values are valid for 2 years from date of

shipment. The cylinders become the property of the

purchaser

41
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2644 ( renewals ) -

POSSIBLE DISCONTINUANCE

Propane in Nitrogen.

Same as SRM 2643.

Nominal concentration: 250 jzmole/mole (ppm) , C^Hg

Same as SRM 2643.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

USE:

REMARKS

Same as SRM 2643

Same as SRM 2643

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2645 (renewals)

Propane in Nitrogen.

Same as SRM 2643.

Nominal concentration:

Same as SRM 2643.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

500 ^mole/mole (ppm) , C3H3

USE: Same as SRM 2643

REMARKS Same as SRM 2643.

42
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2646 (renewals)

Propane in Nitrogen.

Same as SRM 2643.

Nominal concentration: 1000 /xmole/mole (ppm) , C3H3

Same as SRM 2643.

< 1% relative

Same as SRM 2643

Same as SRM 2643

SRMi

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2647 (renewals)

Propane in Nitrogen.

Same as SRM 2643.

Nominal concentration: 2500 /itmole/mole (ppm) , C3H3

Same as SRM 2643.

< 1% relative

Same as SRM 2643

Same as SRM 2643

43
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2648 (renewals)

Propane in Nitrogen.

Same as SRM 2643.

Nominal concentration: 5000 /imole/mole (ppm) , C3H8

Same as SRM 2643.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative

USE:

REMARKS:

Same as SRM 2643

Same as SRM 2643

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2649 (renewals)

Propane in Nitrogen.

Same as SRM 2643.

Nominal concentration: 10,000 ^mole/mole (ppm), C3H8

Same as SRM 2643.

< 1% relative,

Same as SRM 2643

Same as SRM 2643

44
MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USEj.

REMARKS:

SEHi

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2650

Propane in Nitrogen.

Same as SRM 2643.

Nominal concentration: 20,000 /imole/mole (ppm) , C3H8.

Same as SRM 2643.

< 1% relative.

Same as SRM 2643.

Same as SRM 2643.

2651 (renewals)

Propane in Nitrogen and Oxygen.

Propane in nitrogen and oxygen is supplied in aluminum

cylinders at 12.4 MPa (1800 psi) with a deliverable

volume of 0.88 m

3 (31 cubic feet) at STP. They conform

to DOT specifications and are equipped with CGA - 350

valves

Certified concentration: 100 ^mole/mole (ppm) , C3H8

and 5 mole percent oxygen (not certified)

Each cylinder is individually analyzed by comparison

with primary gravimetric standards, using gas

chromatography with flame- ionization detector.

< 1% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

determination of hydrocarbon in mobile -source emissions

when oxygen is of concern.

The certified value of propane is valid for 2 years

from date of purchase. The cylinders become the

property of the purchaser.

45
SRM: 2652 (renewals)

Propane in Oxygen and Nitrogen.

MATERIAL: Same as SRM 2651.

COMPOSITION: Certified nominal concentration: 100 ^mole/mole (ppm)

,

C3H8 and 10 mole percent (not certified)

.

CERTIFICATION: Same as SRM 2651.

UNCERTAINTY OF

CERTIFIED VALUE: < 1% relative.

USE: Same as SRM 2651.

REMARKS: Same as SRM 2651.

SRM:

MATERIAL:

2653 (renewals') - - DISCONTINUED

Nitrogen Dioxide in Air.

Nitrogen dioxide in air is supplied In cylinders with a

deliverable volume of 0.85 m

3 (30 cubic feet) at STP.

They conform to DOT specifications and are equipped

with CGA - 660 valves.

COMPOSITION:

CERTIFICATION:

Nominal concentration: 250 /xmole/mole (ppm), NO2.

Each cylinder is individually analyzed by comparison

with standards verified by gravimetry, using

chemiluminescent reaction of NO with ozone.

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

< 3% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for the

determination of NO2 in stationary source emissions.

This SRM should not be used below a pressure of 2.8 MPa

(400 psi).

The certified values are valid for 1 year from date of

shipment. The cylinder becomes the property of the

purchaser

.

46
MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2654 (renewals)

Nitrogen Dioxide in Air.

Same as SRM 2653.

Nominal concentration: 500 /zmole/mole (ppm) , NO2

Same as SRM 2653.

< 4% relative.

Same as SRM 2653.

Same as SRM 2653.

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2655 (renewals)

Nitrogen Dioxide in Air

Same as SRM 2653.

Nominal concentration:

Same as SRM 2653.

UNCERTAINTY OF

CERTIFIED VALUE: ^ 3% relative.

USE:

REMARKS:

Same as SRM 2653

Same as SRM 2653

1000 /imole/mole (ppm) , NO2

47
SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

2656 (renewals)

Nitrogen Dioxide in Air.

Same as SRM 2653.

Nominal concentration: 2500 /imole/mole (ppm) , NO2

Same as SRM 2653.

UNCERTAINTY OF

CERTIFIED VALUE: < 3% relative

USE:

REMARKS:

Same as SRM 2653

Same as SRM 2653

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

2657 (renewals)

Oxygen in Nitrogen.

Oxygen in nitrogen is supplied in aluminum cylinders at

12.4 MPa (1800 psi) with deliverable volume of 0.88 m

3

(31 cubic feet) at STP. They conform to DOT

specifications and are equipped with CGA - 580 valves.

Nominal concentration: 2 mole percent O2.

Each cylinder is individually analyzed by comparison

with gravimetric standards, using gas chromatography

and paramagnetic analyzer.

< 1% relative.

This SRM is intended primarily for use as a primary

standard in the calibration of instruments used for

combustion control and respiratory gas analysis.

The certified values are valid for 2 years from date of

shipment. The cylinders become the property of the

purchaser

.

48
SRM: 2658 (renewals)

Oxygen in Nitrogen.

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE:

USE:

REMARKS:

SRM:

MATERIAL:

COMPOSITION:

CERTIFICATION:

UNCERTAINTY OF

CERTIFIED VALUE

USE:

REMARKS:

Same as SRM 2657.

Nominal concentration: 10 mole percent O2

Same as SRM 2657.

< 1% relative.

Same as SRM 2657.

Same as SRM 2657.

2659 (renewals)

Oxygen in Nitrogen.

Same as SRM 2657.

Nominal concentration: 21 mole percent O2

Same as SRM 2657.

< 1% relative.

Same as SRM 2657.

Same as SRM 2657.

49
PERMEATION TUBES

Permeation tubes manufactured commercially have gained widespread

acceptance as analytical standards. However, it has been necessary for

each user to calibrate his own tube or to rely on the manufacturer's lot

calibration. The NBS-SRM permeation tubes are individually calibrated to

provide more accurate calibrations than is available from the

manufacturer. Furthermore, through the use of nationally recognized

standards as SRM's, the consistency, accuracy, and compatibility of

measurements on important air pollutants are made possible.

There are four different types of SRM permeation devices available from

NBS . These SRM's provide a means for the production of a gas stream

containing known amounts of an air pollutant at ambient levels . They are

intended for use in the calibration of air pollution monitoring apparatus

and, in addition may be used for the verification of air pollution

analytical methods and procedures. Each tube is individually certified

and is accompanied by a table of certified permeation rates for

temperatures in the range of 20 to 30 °C, except in the case of the

nitrogen dioxide permeation device (SRM 1629) which is only calibrated at

25 °C.

SULFUR DIOXIDE: SRM's 1625, 1626, and 1627 (renewals)

Sulfur dioxide permeation tubes are available in three lengths- -2, 5, and

10 centimeters. The permeation rates are certified over the

temperature range of 20 to 30 °C. The data in Table 3 is provided only

as a guide in the selection of the desired SRM as the certified value may

differ. (Shipment by air permitted except Canada.)

NITROGEN DIOXIDE: SRM 1629 (renewals)

Nitrogen dioxide permeation devices, as stated above, (SRM 1629a) are

calibrated at 25.0 °C only. The temperature coefficient given with each

tube provides the means to calculate permeation rates at other

temperatures near 25 °C. The permeation rates for these tubes are

between 0.5 and 1.5 Mg/min at 25 °C. A tube with a rate of 1.0 ^g/min,

in an air flow of one liter per minute at 25 °C, will produce a

concentration of 0.5 ppm of NO2 . (Cannot be shipped by air.)

BENZENE: SRM 1911 (renewals)

SRM 1911 is a permeation device that is certified for its permeation rate

in micrograms of benzene at 25 °C. It is intended for use in the

preparation of gases of known benzene content and for the standardization

of air pollution and related chemical analyses. A typical permeation

rate for this SRM is .4 ^g/minute at 25 °C. (Cannot be shipped by air.)

50
TETRACHLOROETHYLENE : SRM 1912 (renewals)

SRM 1912 is a permeation device that is certified for its permeation rate

in micrograms of tetrachloroethylene at 25 °C. SRM 1912 is intended for

use in the standardization of apparatus and procedures used in air

pollution and related chemical analyses and for the preparation of gas

mixtures of known tetrachloroethylene concentration. SRM 1912 consists

of a 10 cm permeation tube filled with liquid tetrachloroethylene that

has a constant permeation rate at constant temperature. A typical

permeation rate for this SRM is 1.0 /ig/min, at 25 °C.

TABLE 3

Permeation Typical Concentrations

Tube Rate Flow Rates

Length (/ig/min) Various Flow Rates*

SRM Type (cm) at 25 °C 1 5 10

1625 Sulfur Dioxide

Permeation Tube

10 2.8 1.07 0.214 0.107

1626 Sulfur Dioxide

Permeation Tube

1.4 0.535 0.107 0.0535

1627 Sulfur Dioxide

Permeation Tube

0.56 0.214 0.0428 0.0214

1629a Nitrogen Dioxide 10

Permeation Device

1.0 0.5 0.1 0.05

1911 Benzene Permeation 10

Device

0.4 0.2 0.04 0.02

1912 Tetrachloroethylene 10

Permeation Device

1.0 0.5 0.1 0.05

*Flow rate expressed as liters per minute

51
APPENDIX I

CERTIFICATES FOR GAS CYLINDER STANDARD REFERENCE MATERIALS

52
3MHmj>rttfcf Commerce

tlcolnfefialdrige

Rational ^mmn of j^tambtrtte

Certificate of ^ttal^fe

Standard Reference Material 1658a

Methane in Air

(Nominal Concentration 1 ppm)

(Ambient Air Quality Gas Standard)

This Standard Reference Material is intended for use in the calibration ofinstruments used for the analysis of methane in

ambient air. It is not intended as a daily working standard, but rather as a primary standard to which the concentration

of the daily working standards may be related.

Methane concentration:

Cylinder Number:

^mole/mole (ppm)

Sample Number:

The concentration of methane is relative to all other constituents of the gas.

The uncertainty shown is the estimated upper limit oferror ofthe methane concentration and is the 95 percent confidence

interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified by

cylinder number and sample number on this certificate. This sample is certified only for the concentration of methane.

However, representative samples from this lot have been analyzed for the presence of hydrocarbons other than methane.

The estimated concentration of other hydrocarbons, expressed as methane, is ^mole/mole (ppm).

The original development and evaluation of the methane in air series of Standard Reference Materials was performed in

the Gas and Particulate Science Division by W. P. Schmidt and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C 20234

March 4, 1981

(Editorial Revision of

Certificate dated 12-12-78)

George A. Uriano, Chief

Office of Standard Reference Materials

(over)

53
Certification Information:

The cylinder identified on this certificate is one of a group or "lot" ofcylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that it is homogeneous and stable. Each cylinder in the

lot is individually analyzed at NBS for methane content.

Anatysis:

Methane in this Standard Reference Material was determined by comparisons with a secondary standard that had been

previously intercompared with a set of gravimetric primary standards. The method of intercomparison was gas

chromatography using a flame-ionization detector. The limits of inaccuracy represent the uncertainty in the concentration of methane in the primary gravimetric standards and the imprecision of intercomparison.

Stability:

These samples are contained in aluminum cylinders. The stability is considered good and no loss of concentration has

been observed in similar mixtures contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from the date stamped on this certificate. Periodic reanalyses of representative samples

from this lot will be performed, and if significant changes are observed within the 2 year period the purchasers of other

samples from the lot will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31 cubic

feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 1658a

54
U.S.

National

Ernest

Jfoitonal *$mtmx of j&tattdartfe

(dtttxiitntt of JVnal]j*t*

Standard Reference Material 1 659a

Methane in Air

(Nominal Concentration 10 ppm)

(Ambient Air Quality Gas Standard)

This Standard Reference Material is intended for use in the calibration ofinstruments used for the analysis ofmethane in

ambient air. It is not intended as a daily working standard, but rather as a primary standard to which the concentration

of the daily working standards may be related.

The concentration of methane is relative to all other constituents of the gas.

The uncertainty shown is the estimated upper limit oferror ofthe methane concentration and is the 95 percent confidence

interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified by

cylinder number and sample number on this certificate. This sample is certified only for the concentration of methane.

However, representative samples from this lot have been analyzed for the presence of hydrocarbons other than methane.

The estimated concentration of other hydrocarbons, expressed as methane, is jimole/mole (ppm).

The original development and evaluation of the methane in air series of Standard Reference Materials was performed in

the Gas and Particulate Science Division by W. P. Schmidt and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

March 4, 1 98 1 Office of Standard Reference Materials

(Editorial Revision of (over)

Certificate dated 12-12-78)

Methane concentration: ^mole/mole (ppm)

Cylinder Number: Sample Number:

55
Certification Information:

The cylinder identified on this certificate is one of a group or "lot" ofcylinders. A lot contains a minimum of26 cylinders

and is prepared commercially according to rigid specifications so that it is homogeneous and stable. Each cylinder in the

lot is individually analyzed at NBS for methane content.

Analysis:

Methane in this Standard Reference Material was determined by comparisons with a secondary standard that had been

previously intercompared with a set of gravimetric primary standards. The method of intercomparison was gas

chromatography using a flame-ionization detector. The limits of inaccuracy represent the uncertainty in the concentration of methane in the primary gravimetric standards and the imprecision of intercomparison.

Stability:

These samples are contained in aluminum cylinders. The stability is considered good and no loss of concentration has

been observed in similar mixtures contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from the date stamped on this certificate. Periodic reanalyses ofrepresentative samples

from this lot will be performed, and if significant changes are observed within the 2 year period the purchasers of other

samples from the lot will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31 cubic

feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 1659a

56
U. S. Department of Commerce

Malcolm-fialdrige

Rational J&mt&n of j8>tatutortb

Certificate of ^nal^i*

Standard Reference Material 1 660a

(Nominal

Methane and Propane in Air

Concentrations 4 ppm Methane and 1 ppm

(Ambient Air Quality Gas Standard)

Propane)

This Standard Reference Material is intended for use in the calibration of instruments used to differentiate the methane

and non-methane fractions of hydrocarbon in the atmosphere. It is not intended as a daily working standard, but rather as a primary standard to which the concentration of the daily working standards may be related.

The concentrations of methane and propane are relative to all other constituents of the gas.

The uncertainies shown are the estimated upper limit of error ofthe methane and the propane concentrations and are the

95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentrations given above apply only to the cylinder identified

by cylinder number and sample number on this certificate. This sample is certified only for the concentration of methane

and propane. However, representative samples from this lot have been analyzed for the presence of hydrocarbons other

than methane and propane. The estimated concentration of other hydrocarbons, expressed as methane,

is ^mole/mole (ppm).

The original development and evaluation of the methane and propane in air series of Standard Reference Materials was

performed in the Gas and Particulate Science Division by W. P. Schmidt and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

March 4, 1 98 1 Office of Standard Reference Materials

(Editorial Revision of (over)

Certificate dated 12-12-78)

Methane concentration: ± ptmole/ mole (ppm)

Propane concentration: ^mole/ mole (ppm)

Cylinder Number: Sample Number:

57
Certification Information:

The cylinder identified on this certificate is one of a group or "lot" ofcylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that it is homogeneous and stable. Each cylinder in the

lot is individually analyzed at NBS for both methane and propane content.

Analysis:

Propane and methane fractions in this Standard Reference Material were determined by comparisons with secondary

standards that had been previously intercompared with a set of gravimetric primary standards for each constituent. The

method of intercomparison was gas chromatography using a flame-ionization detector. The limits of inaccuracy

represent the uncertainty in the concentration of propane and methane in the primary gravimetric standards and the

imprecision of intercomparison.

Stability:

These samples are contained in aluminum cylinders. The stability is considered good and no loss of concentration has

been observed in similar mixtures contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from the date stamped on this certificate. Periodic reanalyses ofrepresentative samples

from this lot will be performed, and if significant changes are observed within the 2 year period the purchasers of other

samples from the lot will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31 cubic

feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 1660a

58
U. S. Departm$itt'6f Commerce

Malcolrg^aldrige 'Secrel^ryf

Rational ^trram of jitatttlartte

(Eerttfttat* of ^ttaljjste

Standard Reference Material 1661a

Sulfur Dioxide in Nitrogen

(Nominal Concentration 500 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of sulfur

dioxide emitted from stationary sources. It is not intended as a working standard, but rather as a primary standard to

which the concentration of other standards may be related. Each cylinder is individually analyzed and the concentration

that appears below applies to the cylinder identified on this certificate.

The concentration of sulfur dioxide is relative to all other constituents ofthe gas. The uncertainty shown is the estimated

upper limit of error of the sulfur dioxide concentration. This uncertainty includes the imprecision of the intercomparisons at the 95 percent confidence level and the inaccuracy in the peroxide method including the measurement of

volume and the standardization of the reagent solution.

The original development and evaluation of the sulfur dioxide in nitrogen series of Standard Reference Materials was

performed at the National Bureau of Standards by W. P. Schmidt and E. R. Deardorff.

The overall direction and coordination of technical measurements leading to certification were performed in the Gas and

Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

March 20, 1 98 1 Office of Standard Reference Materials

Sulfur dioxide concentration: /umole/ mole (ppm)

Cylinder Number: Sample Number:

(over)

59
Certification Information

The cylinder identified in this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of26 cylinders

which is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for sulfur dioxide content.

Analysis:

The sulfur dioxide content of this Standard Reference Material was determined by comparison with a set of NBS

primary standards. The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity detector and/ or a non-dispersive infrared analyzer. The primary standards were analyzed by the hydrogen

peroxide method which is considered to be inherently accurate in the concentration range of this SRM. This has been

confirmed by the gravimetric determination of sulfur dioxide in samples previously analyzed by the peroxide method.

The gravimetric method was evaluated by analyzing sulfuric acid standards prepared volumetrically. No evidence of a

systematic error in the peroxide method has been observed.

Stability:

This SRM is contained in an aluminum cylinder. Samples of sulfur dioxide in nitrogen in similar containers have been

periodically analyzed over a period of two years and no change in concentration has been observed.

The value appearing on this certificate is valid for two years from the latest date stamped on this certificate. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed

within the two-year period, purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of approximately 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m

3 (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA/660 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 1661a

60
Rational ££uram

Certificate of

of Standards

(Anal^si*

Standard Reference Material 1662a

Sulfur Dioxide in Nitrogen

(Nominal Concentration 1000 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of sulfur

dioxide emitted from stationary sources. It is not intended as a working standard, but rather as a primary standard to

which the concentration of other standards may be related. Each cylinder is individually analyzed and the concentration

that appears below applies to the cylinder identified on this certificate.

The concentration of sulfur dioxide is relative to all other constituents ofthe gas. The uncertainty shown is the estimated

upper limit of error of the sulfur dioxide concentration. This uncertainty includes the imprecision of the intercomparisons at the 95 percent confidence level and the inaccuracy in the peroxide method including the measurement of

volume and the standardization of the reagent solution.

The original development and evaluation of the sulfur dioxide in nitrogen series of Standard Reference Materials was

performed at the National Bureau of Standards by W. P. Schmidt and E. R. Deardorff.

The overall direction and coordination of technical measurements leading to certification were performed in the Gas and

Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

March 20, 1 98 1 Office of Standard Reference Materials

(Revision of Certificate

dated 2-5-80) (over)

Sulfur dioxide concentration: nmole/ mole (ppm)

Cylinder Number: Sample Number:
Certification Information

The cylinder identified in this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of26 cylinders

which is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for sulfur dioxide content.

Analysis:

The sulfur dioxide content of this Standard Reference Material was determined by comparison with a set of NBS

primary standards. The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity detector and/or a non-dispersive infrared analyzer. The primary standards were analyzed by the hydrogen

peroxide method which is considered to be inherently accurate in the concentration range of this SRM. This has been

confirmed by the gravimetric determination of sulfur dioxide in samples previously analyzed by the peroxide method.

The gravimetric method was evaluated by analyzing sulfuric acid standards prepared volumetrically. No evidence of a

systematic error in the peroxide method has been observed.

Stability:

This SRM is contained in an aluminum cylinder. Samples of sulfur dioxide in nitrogen in similar containers have been

periodically analyzed over a period of two years and no change in concentration has been observed.

The value appearing on this certificate is valid for two years from the latest date stamped on this certificate. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed

within the two-year period, purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of approximately 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m

3 (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA/660 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 1662a

62
U. S. Department of Commerce

Malcolntjjjajdrigc "SecreivVf

National lurwp 5f"! Itandards Ernest ^mbl^r^IJIrector

Rational J&mtmx of j^tandante

Certificate of ^nal^i*

Standard Reference Material 1663a

Sulfur Dioxide in Nitrogen

(Nominal Concentration 1500 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of sulfur

dioxide emitted from stationary sources. It is not intended as a working standard, but rather as a primary standard to

which the concentration of other standards may be related. Each cylinder is individually analyzed and the concentration

that appears below applies to the cylinder identified on this certificate.

Sulfur dioxide concentration: ± pinole/ mole (ppm)

Cylinder Number: Sample Number:

The concentration of sulfur dioxide is relative to all other constituents of the gas. The uncertainty shown is the estimated

upper limit of error of the sulfur dioxide concentration. This uncertainty includes the imprecision of the intercomparisons at the 95 percent confidence level and the inaccuracy in the peroxide method including the measurement of

volume and the standardization of the reagent solution.

The original development and evaluation of the sulfur dioxide in nitrogen series of Standard Reference Materials was

performed at the National Bureau of Standards by W. P. Schmidt and E. R. Deardorff.

The overall direction and coordination of technical measurements leading to certification were performed in the Gas and

Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

March 20, 1 98 1 Office of Standard Reference Materials

(Revision of Certificate

dated 2-5-80) (over)

63
Certification Information

The cylinder identified in this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

which is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for sulfur dioxide content.

Analysis:

The sulfur dioxide content of this Standard Reference Material was determined by comparison with a set of NBS

primary standards. The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity detector and/or a non-dispersive infrared analyzer. The primary standards were analyzed by the hydrogen

peroxide method which is considered to be inherently accurate in the concentration range of this SRM. This has been

confirmed by the gravimetric determination of sulfur dioxide in samples previously analyzed by the peroxide method.

The gravimetric method was evaluated by analyzing sulfuric acid standards prepared volumetrically. No evidence of a

systematic error in the peroxide method has been observed.

Stability:

This SRM is contained in an aluminum cylinder. Samples of sulfur dioxide in nitrogen in similar containers have been

periodically analyzed over a period of two years and no change in concentration has been observed.

The value appearing on this certificate is valid for two years from the latest date stamped on this certificate. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed

within the two-year period, purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of approximately 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m

3 (3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA/660 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 1663a

64
U. S. Department 6f Commerce

Malcolnt^Baldr ige

Rational ^umu of j^tantlartte

(dtttxixtntt of (Anal^t*

Standard Reference Material 1664a

Sulfur Dioxide in Nitrogen

(Nominal Concentration 2500 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of sulfur

dioxide emitted from stationary sources. It is not intended as a working standard, but rather as a primary standard to which the concentration of other standards may be related. Each cylinder is individually analyzed and the concentration

that appears below applies to the cylinder identified on this certificate.

The concentration of sulfur dioxide is relative to all other constituents ofthe gas. The uncertainty shown is the estimated

upper limit of error of the sulfur dioxide concentration. This uncertainty includes the imprecision of the intercomparisons at the 95 percent confidence level and the inaccuracy in the peroxide method including the measurement of

volume and the standardization of the reagent solution.

The original development and evaluation of the sulfur dioxide in nitrogen series of Standard Reference Materials was

performed at the National Bureau of Standards by W. P. Schmidt and E. R. Deardorff.

The overall direction and coordination oftechnical measurements leading to certification were performed in the Gas and

Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

March 20, 1 98 1 Office of Standard Reference Materials

Sulfur dioxide concentration: /umole/ mole (ppm)

Cylinder Number: Sample Number

(over)

65
Certification Information

The cylinder identified in this certificate is one of a group or "lor of cylinders. A lot contains a minimum of26 cylinders

which is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for sulfur dioxide content.

Analysis:

The sulfur dioxide content of this Standard Reference Material was determined by comparison with a set of NBS

primary standards. The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity detector and/ or a non-dispersive infrared analyzer. The primary standards were analyzed by the hydrogen

peroxide method which is considered to be inherently accurate in the concentration range of this SRM. This has been

confirmed by the gravimetric determination of sulfur dioxide in samples previously analyzed by the peroxide method.

The gravimetric method was evaluated by analyzing sulfuric acid standards prepared volumetrically. No evidence of a

systematic error in the peroxide method has been observed.

Stability:

This SRM is contained in an aluminum cylinder. Samples of sulfur dioxide in nitrogen in similar containers have been

periodically analyzed over a period of two years and no change in concentration has been observed.

The value appearing on this certificate is valid for two years from the latest date stamped on this certificate. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed

within the two-year period, purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of approximately 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m

3 (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA/660 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal

SRM 1664a

66
U. S. Department of Commerce

Philip M. Klutznick

Secretary

National Bureau of Standards

Ernest Ambler, Director

Rational ^mmn of Standards

Certificate of (Analysis

Standard Reference Material 1665b

Propane in Air

(Nominal Concentration 3 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of the daily working standards may be related.

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the propane concentration at the 95 percent confidence level. This uncertainty

includes the inaccuracy of the gravimetric primary standard and the imprecision of intercomparison with the

gravimetric standards. This sample is certified only for the concentration of propane. However, representative

samples from the lot ha\e been examined for the presence of other hydrocarbons. The estimated concentration

of other hydrocarbons, expressed as propane, is jumole/mole (ppm).

Each cylinder is individually analyzed and the concentration appearing above applies to the cylinder number

and sample number identified on this certificate.

The original development and evaluation of the Propane in Air Series of these Standard Reference Materials was performed at the National Bureau of Standards by W. P. Schmidt and W. D. Dorko.

The overall direction and coordination of technical measurements leading to certification were performed in the

Gas and Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 31, 1980 Office of Standard Reference Materials

Propane concentration:

Cylinder Number: Sample Number:

+ /xmole/mole (ppm)

(over)

67
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of

gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped

with a flame ionization detector.

The oxygen content of this sample is 20.9 mole percent.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year period,

purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1665b

68
U. S. Department of Commerce

Philip M. Klutznick

Secretary

I ~ [ National Burwa of Standards

Ernest Ambler, Director

^attattal ££wratw

Certificate of t&nalyzxz

Standard Reference Material 1666b

Propane in Air

(Nominal Concentration 10 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of the daily working standards may be related.

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the propane concentration at the 95 percent confidence level. This uncertainty

includes the inaccuracy of the gravimetric primary standard and the imprecision of intercomparison with the

gravimetric standards. This sample is certified only for the concentration of propane. However, representative

samples from the lot have been examined for the presence of other hydrocarbons. The estimated concentration

of other hydrocarbons, expressed as propane, is jumole/mole (ppm).

Each cylinder is individually analyzed and the concentration appearing above applies to the cylinder number

and sample number identified on this certificate.

The original development and evaluation of the Propane in Air Series of these Standard Reference Materials

was performed at the National Bureau of Standards by W. P. Schmidt and W. D. Dorko.

The overall direction and coordination of technical measurements leading to certification were performed in the

Gas and Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 31, 1980 Office of Standard Reference Materials

Propane concentration:

Cylinder Number: Sample Number:

yumole/mole (ppm)

(over)

69
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of

gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped

with a flame ionization detector.

The oxygen content of this sample is 20.9 mole percent.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year period,

purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1666b

70
U. S. Department of Commerce

Philip M. Klutznick

Secretary

National Bureau of Standards

Ernest Ambler, Director

^National JSureau of ^tnndnvds

Certificate of t&nnlijsxz

Standard Reference Material 1667b

Propane in Air

(Nominal Concentration 50 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of the daily working standards may be related.

Propane concentration: ± ^imole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the propane concentration at the 95 percent confidence level. This uncertainty

includes the inaccuracy of the gravimetric primary standard and the imprecision of intercomparison with the

gravimetric standards. This sample is certified only for the concentration of propane. However, representative

samples from the lot have been examined for the presence of other hydrocarbons. The estimated concentration

of other hydrocarbons, expressed as propane, is jumole/mole (ppm).

Each cylinder is individually analyzed and the concentration appearing above applies to the cylinder number

and sample number identified on this certificate.

The original development and evaluation of the Propane in Air Series of these Standard Reference Materials

was performed at the National Bureau of Standards by W. P. Schmidt and W. D. Dorko.

The overall direction and coordination of technical measurements leading to certification were performed in the

Gas and Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 31, 1980 Office of Standard Reference Materials

(over)

71
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of

gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped

with a flame ionization detector.

The oxygen content of this sample is 20.9 mole percent.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year period,

purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

(31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1667b

72
U. S. Departmeilt of Commerce

Philip M^Mutznick

National term* drStandards

Ernest (Ambler, Director

Rational ^nttmx of j^tattdartte

Certificate of ^naljjsi*

Standard Reference Material 1668b

Propane in Air

(Nominal Concentration 100 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of the daily working standards may be related.

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the propane concentration at the 95 percent confidence level. This uncertainty

includes the inaccuracy of the gravimetric primary standard and the imprecision of intercomparison with the

gravimetric standards. This sample is certified only for the concentration of propane. However, representative

samples from the lot have been examined for the presence of other hydrocarbons. The estimated concentration

of other hydrocarbons, expressed as propane, is /umole/mole (ppm).

Each cylinder is individually analyzed and the concentration appearing above applies to the cylinder number

and sample number identified on this certificate.

The original development and evaluation of the Propane in Air Series of these Standard Reference Materials

was performed at the National Bureau of Standards by W. P. Schmidt and W. D. Dorko.

The overall direction and coordination of technical measurements leading to certification were performed in the

Gas and Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 31, 1980 Office of Standard Reference Materials

Propane concentration:

Cylinder Number: Sample Number:

+ ^mole/mole (ppm)

(over)

73
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of

gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped

with a flame ionization detector.

The oxygen content of this sample is 20.9 mole percent.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year period,

purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1668b

74
U. S. Department of Commerce

Philip M. Klutznick

(Secretary

Rational J&txtmn of j^ianttanta

(fltttxixtnte of J^naljjsi*

Standard Reference Material 1669b

Propane in Air

(Nominal Concentration 500 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of the daily working standards may be related.

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the propane concentration at the 95 percent confidence level. This uncertainty

includes the inaccuracy of the gravimetric primary standard and the imprecision of intercomparison with the

gravimetric standards. This sample is certified only for the concentration of propane. However, representative

samples from the lot have been examined for the presence of other hydrocarbons. The estimated concentration

of other hydrocarbons, expressed as propane, is /timole/mole (ppm).

Each cylinder is individually analyzed and the concentration appearing above applies to the cylinder number

and sample number identified on this certificate.

The original development and evaluation of the Propane in Air Series of these Standard Reference Materials

was performed at the National Bureau of Standards by W. P. Schmidt and W. D. Dorko.

The overall direction and coordination of technical measurements leading to certification were performed in the

Gas and Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 31, 1980 Office of Standard Reference Materials

Propane concentration:

Cylinder Number: Sample Number:

+ jumole/mole (ppm)

(over)

75
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of

gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped

with a flame ionization detector.

The oxygen content of this sample is 20.9 mole percent.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year period,

purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1669b

76
U. S. Department of Commerce

Malcpjnrfialdrige

iaryj

7

Rational ^Bureau of jitantlartte

(Utttiixtntt of ^mhg&xz

Standard Reference Material 1670

Carbon Dioxide in Air

(Nominal Concentration 330 ppm)

(Atmospheric Carbon Dioxide Standard)

This Standard Reference Material is intended for use in the calibration of instruments and methods used for the

measurement of carbon dioxide in the atmosphere. It is not intended as a working standard, but rather as a primary

laboratory standard, to which the concentration of carbon dioxide in other standards may be related.

Carbon dioxide concentration:

Cylinder Number:

H mole/ mole (ppm)

Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the carbon dioxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified by

cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas-handling system.

The research and development leading to the certification of this SRM were performed in the Gas and Particulate

Science Division by E.E. Hughes, G.A. Sleater, and R.C. Myers.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E.E. Hughes and H.L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

Washington, D.C. 20234

December 9, 1982 (over)

George A. Uriano, Chief

Office of Standard Reference Materials

77
Analysis

The carbon dioxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of inter- comparison was gas chromatography and /or a nondispersive infrared method.

Representative samples from this batch of Standard Reference Materials have been analyzed for nitrous oxide (N2O)

content, and oxygen. The concentrations of components listed in Table I are not certified but are given for information

only.

Table 1

Estimated Concentration

Component in Samples of this Batch

Oxygen 20.95 mole percent

Nitrous Oxide 0.06 ppm by mole

Note: Water vapor was measured in a number of samples and while the concentration varied from sample to sample the

maximum observed concentration in a full cylinder was 24 parts per million by mole.

Uncertainty

The estimated upper limit of the total uncertainty of the concentration of this SRM is 0.2 ppm at the 95% confidence

interval. This value is based on systematic errors associated with gravimetric standards, the random errors associated

with the comparison of the gravimetric standards to the secondary standards, and the comparison of the secondary

standards to the SRM.

Two samples from this batch have been independently analyzed by P. Guenther at the laboratory of Dr. Charles Keeling

at the Scripps Institute of Oceanography (SIO), LaJolla, California. The difference between the concentration assigned

by NBS and that measured by SIO was no greater than 0.02 ppm.

Concentration Concentration

Assigned by NBS Measured by SIO

Sample A 335.61 335.61

Sample B 335.49 335.47

The agreement between NBS and SIO on multiple intercomparisons of CO2 standards allow direct intercomparison of

data derived from analytical systems calibrated with either of the two standard materials.

Stability

Measurements have been made of many samples in this batch over time intervals up to 18 months and no evidence has

been found of changes in the concentration of carbon dioxide. However, in several instances samples from this batch and

other batches of carbon dioxide in air have exhibited an increase in concentration when the cylinder pressure fell to a

pressure below 1.04 MPa (150 psi). It is not recommended that the sample be used as an analytical standard after the

pressure has fallen below 2.07 MPa (300 psi).

The concentration on the certificate is valid for two years from the date of shipment from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS and, if significant changes are observed, the purchasers of

samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of approximately 0.76 m

3 (27 cubic feet) at STP. The

cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National Bureau of

Standards for reanalysis.

Reanalysis

When this Standard Reference Material is used as a standard in a long-term program of analysis of atmospheric carbon

dioxide, it may be analytically necessary to confirm the original certification during or at the end of the certification

period. The National Bureau of Standards will reanalyze this Standard Reference Material for the original purchaser at a cost not to exceed the cost of similar materials available at the time of the request for reanalysis. The original purchaser

should contact the Gas and Particulate Science Division of the National Bureau of Standards to arrange for reanalysis.

Please contact William Dorko, 301-921-2886.

78
Rational ££u«au of jltandartte

Certificate of Analyst*

Standard Reference Material 1671

Carbon Dioxide in Air

(Nominal Concentration 340 ppm)

(Atmospheric Carbon Dioxide Standard)

This Standard Reference Material is intended for use in the calibration of instruments and methods used for the

measurement of carbon dioxide in the atmosphere. It is not intended as a working standard, but rather as a primary

laboratory standard, to which the concentration of carbon dioxide in other standards may be related.

Carbon dioxide concentration: ± /nmole/ mole (ppm)

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the carbon dioxide concentration and is the 95 percent confidence interval based on

allowances for known source^ of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified by

cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas-handling system.

The research and development leading to the certification of this SRM were performed in the Gas and Particulate

Science Division by E.E. Hughes, G.A. Sleater, and R.C. Myers.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E.E. Hughes and H.L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

U. S. Departri^fW 'Of Commerce

Malcolmrfialdrige

National lurmioPltandards

Ernest lAmMpr. Director

Washington, D.C. 20234 George A. Uriano, Chief

December 9, 1982 (over) Office of Standard Reference Materials

79
Analysis

The carbon dioxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of inter- comparison was gas chromatography and /or a nondispersive infrared method.

Representative samples from this batch of Standard Reference Materials have been analyzed for nitrous oxide (N2O)

content, and oxygen. The concentrations of components listed in Table 1 are not certified but are given for information

only.

Table I

Estimated Concentration

Component in Samples of this Batch

Oxygen 20.95 mole percent

Nitrous Oxide 0.08 ppm by mole

Note: Water vapor was measured in a number of samples and while the concentration varied from sample to sample the

maximum observed concentration in a full cylinder was 24 parts per million by mole.

Uncertainty

The estimated upper limit of the total uncertainty of the concentration of this SRM is 0.2 ppm at the 95% confidence

interval. This value is based on systematic errors associated with gravimetric standards, the random errors associated

with the comparison of the gravimetric standards to the secondary standards, and the comparison of the secondary

standards to the SRM.

Two samples from this batch have been independently analyzed by P. Guenther at the 1 aboratory of Dr. Charles Keeling

at the Scripps Institute of Oceanography (SIO), LaJolla, California. The difference between the concentration assigned

by NBS and that measured by SIO was no greater than 0.02 ppm.

Concentration Concentration

Assigned by NBS Measured by SIO

Sample A 342.31 342.36

Sample B 342.65 342.64

The agreement between NBS and SIO on multiple intercomparisons of CO2 standards allow direct intercomparison of

data derived from analytical systems calibrated with either of the two standard materials.

Stability

Measurements have been made of many samples in this batch over time intervals up to 18 months and no evidence has

been found of changes in the concentration of carbon dioxide. However, in several instances samples from this batch and

other batches of carbon dioxide in air have exhibited an increase in concentration when the cylinder pressure fell to a

pressure below 1.04 MPa (150 psi). It is not recommended that the sample be used as an analytical standard after the

pressure has fallen below 2.07 MPa (300 psi).

The concentration on the certificate is valid for two years from the date of shipment from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS and, if significant changes are observed, the purchasers of

samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of approximately 0.76 m

? (27 cubic feet) at STP. The

cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National Bureau ol Standards for reanalysis.

Reanalysis

When this Standard Reference Material is used as a standard in a long-term program of analysis of atmospheric carbon

dioxide, it may be analytically necessary to confirm the original certification during or at the end of the certification

period. The National Bureau of Standards will reanalyze this Standard Reference Material for the original purchaser at a cost not to exceed the cost of similar materials available at the time of the request for reanalysis. The original purchaser

should contact the Gas and Particulate Science Division of the National Bureau of Standards to arrange for reanalysis.

Please contact William Dorko, 301-921-2886.

80
U. S. Department of Commerce

Malcolm Baldrige

'Secretary

National Bur«»t« of ^landards

Ernetl Umbler, Qlrector

Rational ^Bureau of jltattttartte

(dttixixtntt of ^ttal^st*

Standard Reference Material 1672

Carbon Dioxide in Air

(Nominal Concentration 350 ppm)

(Atmospheric Carbon Dioxide Standard)

This Standard Reference Material is intended for use in the calibration of instruments and methods used for the

measurement of carbon dioxide in the atmosphere. It is not intended as a working standard, but rather as a primary

laboratory standard, to which the concentration of carbon dioxide in other standards may be related.

The concentration of carbon dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the carbon dioxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified by

cylinder number and sample number on this certificate.

CAUTION : Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas-handling system.

The research and development leading to the certification of this SRM were performed in the Gas and Particulate

Science Division by E.E. Hughes, G.A. Sleater, and R.C. Myers.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E.E. Hughes and H.L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

December 9, 1 982 (over) Office of Standard Reference Materials

Carbon dioxide concentration: + /imole/mole (ppm)

Cylinder Number: Sample Number:

81
Analysis

The carbon dioxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of inter- comparison was gas chromatography and /or a nondispersive infrared method.

Representative samples from this batch of Standard Reference Materials have been analyzed for nitrous oxide (N2O)

content, and oxygen. The concentrations of components listed in Table 1 are not certified but are given for information

only.

Table 1

Estimated Concentration

Component in Samples of this Batch

Oxygen 20.95 mole percent

Nitrous Oxide 0.03 ppm by mole

Note: Water vapor was measured in a number of samples and while the concentration varied from sample to sample the

maximum observed concentration in a full cylinder was 24 parts per million by mole.

Uncertainty

The estimated upper limit of the total uncertainty of the concentration of this SRM is 0.2 ppm at the 95% confidence

interval. This value is based on systematic errors associated with gravimetric standards, the random errors associated

with the comparison of the gravimetric standards to the secondary standards, and the comparison of the secondary

standards to the SRM.

Two samples from this batch have been independently analyzed by P. Guenther at the laboratory of Dr. Charles Keeling

at the Scripps Institute of Oceanography (SIO), LaJolla, California. The difference between the concentration assigned

by NBS and that measured by SIO was no greater than 0.02 ppm.

Concentration Concentration

Assigned by NBS Measured by SIO

Sample A 351.08 351.03

Sample B 351.11 351.14

The agreement between NBS and SIO on multiple intercomparisons of CO2 standards allow direct intercomparison of

data derived from analytical systems calibrated with either of the two standard materials.

Stability

Measurements have been made of many samples in this batch over time intervals up to 18 months and no evidence has

been found of changes in the concentration of carbon dioxide. However, in several instances samples from this batch and

other batches of carbon dioxide in air have exhibited an increase in concentration when the cylinder pressure fell to a

pressure below 1.04 MPa (150 psi). It is not recommended that the sample be used as an analytical standard after the

pressure has fallen below 2.07 MPa (300 psi).

The concentration on the certificate is valid for two years from the date of shipment from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS and, if significant changes are observed, the purchasers of

samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of approximately 0.76 m

3 (27 cubic feet) at STP. The

cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National Bureau of

Standards for reanalysis.

Reanalysis

When this Standard Reference Material is used as a standard in a long-term program of analysis of atmospheric carbon

dioxide, it may be analytically necessary to confirm the original certification during or at the end of the certification

period. The National Bureau of Standards will reanalyze this Standard Reference Material for the original purchaser at a cost not to exceed the cost of similar materials available at the time of the request for reanalysis. The original purchaser

should contact the Gas and Particulate Science Division of the National Bureau of Standards to arrange for reanalysis.

Please contact William Dorko, 301-921-2886.

82
U. S. Oepaitmertl of Commerce

PhUipMr-autznlcIt

ternary"

National EmeuilllMlli tAmUer,

dardt

lor Rational ^txttnn af j&tantbtrtte

Certificate af ^mlyzxz

Standard Reference Material 1674b

Carbon Dioxide in Nitrogen

(Nominal Concentration 7 percent)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon dioxide in mobile source emissions and related uses. It is not intended as a daily working standard, but

rather as a primary standard to which the concentration of the daily working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the carbon dioxide concentration and is the 95 percent confidence interval

based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration appearing above applies to the cylinder

identified by cylinder number and sample number on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed at the National Bureau of Standards by W. D. Dorko and W. P. Schmidt.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Analysis

The carbon dioxide in this Standard Reference Material was determined by comparison with a secondary

standard that had previously been intercompared with a set of gravimetric primary standards. The method of

intercomparison was gas chromatography using thermal conductivity determination of carbon dioxide. The

gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative samples from this lot will be performed, and if any change in concentration is observed the purchasers of samples from this lot will be notified.

The Standard Reference Material should be stored at room temperature and should not be allowed to experience either high or low ambient temperature.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 g3 Office of Standard Reference Materials
I

i
U. S. Department of Commerce

Philip M, *Jutznick Kecraa

National

Ernest

:ary

iutmm drstandards Ambler, pirector Rational *$mmn of Standard*

(dtttxixtntt of ^mhgzxz

Standard Reference Material 1675b

Carbon Dioxide in Nitrogen

(Nominal Concentration 14 percent)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon dioxide in mobile source emissions and related uses. It is not intended as a daily working standard, but

rather as a primary standard to which the concentration of the daily working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the carbon dioxide concentration and is the 95 percent confidence interval

based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration appearing above applies to the cylinder

identified by cylinder number and sample number on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed at the National Bureau of Standards by W. D. Dorko and W. P. Schmidt.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills. Analysis

The carbon dioxide in this Standard Reference Material was determined by comparison with a secondary

standard that had previously been intercompared with a set of gravimetric primary standards. The method of

intercomparison was gas chromatography using thermal conductivity determination of carbon dioxide. The

gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative samples from this lot will be performed, and if any change in concentration is observed the purchasers of samples from this lot will be notified.

The Standard Reference Material should be stored at room temperature and should not be allowed to experience either high or low ambient temperature.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234

January 25, 1980 85

George A. Uriano, Chief

Office of Standard Reference Materials

S. Department of Commerce

Philip M. Klutznick

National Swaui of Standards

Ernest Ambler, Director

Rational £Suram of j^tamlartte

(dtttxiitntt of (Analyst*

Standard Reference Material 1677c

Carbon Monoxide in Nitrogen

(Nominal Concentration 10 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon monoxide in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of other standards may be related.

Carbon monoxide concentration: ± /umole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of carbon monoxide is relative to all other constituents of the gas.

The uncertainty shown is the estimated upper limit of error of the carbon monoxide concentration and is the

95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

The original development and evaluation of the carbon monoxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by J. M. Ives and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

(over)

87
Analysis

Carbon monoxide in the Standard Reference Material was determined by comparisons with a secondary

standard that had been previously intercompared with a set of primary gravimetric standards. The methods of

intercomparison involved catalytic reduction ofcarbon monoxide with hydrogen and subsequent analysis of the

resulting methane with a flame-ionization hydrocarbon analyzer and nondispersive infrared analysis.

Stability

These samples are contained in aluminum cylinders. The stability is considered good and no loss of concentration has been observed in similar mixtures contained in aluminum cylinders. However, the value appearing on

this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed, and if significant changes are observed within the 2 year period the

purchasers of other samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1677c

88
U. S. Department of Commerce

PhilipMi KJutznick

,1

National )ur*a»or Standards

Ernest lAmbler, Director

Rational f&mtnn of j^tantlartte

Certificate of ^nal^i*

Standard Reference Material 1678c

Carbon Monoxide in Nitrogen

(Nominal Concentration 50 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon monoxide in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of other standards may be related.

The concentration of carbon monoxide is relative to all other constituents of the gas.

The uncertainty shown is the estimated upper limit of error of the carbon monoxide concentration and is the

95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

The original development and evaluation of the carbon monoxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by J. M. Ives and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

Carbon monoxide concentration: /Limole/mole (ppm)

Cylinder Number: Sample Number:

(over)

89
Analysis

Carbon monoxide in the Standard Reference Material was determined by comparisons with a secondary

standard that had been previously intercompared with a set of primary gravimetric standards. The methods of

intercomparison involved catalytic reduction ofcarbon monoxide with hydrogen and subsequent analysis of the

resulting methane with a flame-ionization hydrocarbon analyzer and nondispersive infrared analysis.

Stability

These samples are contained in aluminum cylinders. The stability is considered good and no loss of concentration has been observed in similar mixtures contained in aluminum cylinders. However, the value appearing on

this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed, and if significant changes are observed within the 2 year period the

purchasers of other samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1678c

90
U. S. Department of Commerce

Philip M. Klutzfiick Secretary

National burwa of Standards

Ernest Ambler, pirector

Rational ^Bureau of jStantlartte

Certificate of (Analysts

Standard Reference Material 1679c

Carbon Monoxide in Nitrogen

(Nominal Concentration 100 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon monoxide in mobile-source emissions. It is not intended as a working standard, but rather as a primary

Standard to which the concentration of other standards may be related.

Carbon monoxide concentration: ± /umole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of carbon monoxide is relative to all other constituents of the gas.

The uncertainty shown is the estimated upper limit of error of the carbon monoxide concentration and is the

95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

The original development and evaluation of the carbon monoxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by J. M. Ives and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

(over)

91
Analysis

Carbon monoxide in the Standard Reference Material was determined by comparisons with a secondary

standard that had been previously intercompared with a set of primary gravimetric standards. The methods of

intercomparison involved catalytic reduction ofcarbon monoxide with hydrogen and subsequent analysis of the

resulting methane with a flame-ionization hydrocarbon analyzer and nondispersive infrared analysis.

Stability

These samples are contained in aluminum cylinders. The stability is considered good and no loss of concentration has been observed in similar mixtures contained in aluminum cylinders. However, the value appearing on

this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed, and if significant changes are observed within the 2 year period the

purchasers of other samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1679c

92
. S. Department of Commerce

Philip M» Klutznick

Secretary

Rational ^mtmx of jltatulartte

Certificate of ^nal||*i*

Standard Reference Material 1680b

Carbon Monoxide in Nitrogen

(Nominal Concentration 500 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon monoxide in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of other standards may be related.

The concentration of carbon monoxide is relative to all other constituents of the gas.

The uncertainty shown is the estimated upper limit of error of the carbon monoxide concentration and is the

95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

The original development and evaluation of the carbon monoxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by J. M. Ives and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

Carbon monoxide concentration: /umole/mole (ppm)

Cylinder Number: Sample Number:

(over)

93
Analysis

Carbon monoxide in the Standard Reference Material was determined by comparisons with a secondary

standard that had been previously intercompared with a set of primary gravimetric standards. The methods of

intercomparison involved catalytic reduction ofcarbon monoxide with hydrogen and subsequent analysis of the

resulting methane with a flame-ionization hydrocarbon analyzer and nondispersive infrared analysis.

Stability

These samples are contained in aluminum cylinders. The stability is considered good and no loss of concentration has been observed in similar mixtures contained in aluminum cylinders. However, the value appearing on

this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed, and if significant changes are observed within the 2 year period the

purchasers of other samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3

(3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1680b

94
U. S. DepartitMiit of Commerce

Philip M^KIutznick

Secmaryr'

National Sunui oijUandardi

Ernest ^Ambler, pirector

Rational f&mtmx of j^tandartte

(dtttxixtntt of (Analyst*

Standard Reference Material 1681b

Carbon Monoxide in Nitrogen

(Nominal Concentration 1000 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon monoxide in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of other standards may be related.

Carbon monoxide concentration:

Cylinder Number:

/umole/mole (ppm)

Sample Number:

The concentration of carbon monoxide is relative to all other constituents of the gas.

The uncertainty shown is the estimated upper limit of error of the carbon monoxide concentration and is the

95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

The original development and evaluation of the carbon monoxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by J. M. Ives and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234

January 25, 1980

George A. Uriano, Chief

Office of Standard Reference Materials

(over)

95
Analysis

Carbon monoxide in the Standard Reference Material was determined by comparisons with a secondary

standard that had been previously intercompared with a set of primary gravimetric standards. The methods of

intercomparison involved catalytic reduction of carbon monoxide with hydrogen and subsequent analysis of the

resulting methane with a flame-ionization hydrocarbon analyzer and nondispersive infrared analysis.

Stability

These samples are contained in aluminum cylinders. The stability is considered good and no loss of concentration has been observed in similar mixtures contained in aluminum cylinders. However, the value appearing on

this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed, and if significant changes are observed within the 2 year period the

purchasers of other samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

(31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1681b
. S. Department of Commerce

Philip Mg&utznick

Rational JSttram of ^tandntdz

Certificate of (Analggfe

Standard Reference Material 1683b

Nitric Oxide in Nitrogen

(Nominal Concentration 50 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

oxides of nitrogen in mobile-source emissions. It is not intended as a working standard, but rather as ? irimary

standard to which the concentration of other standards may be related.

The concentration of nitric oxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitric oxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible "error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

CAUTION: Every precaution must be taken to avoid accidental contamination of the sample with atmospheric air during connection of the cylinder to any gas handling system.

The original development and evaluation of the nitric oxide in nitrogen series of Standard Reference Materials

was performed in the Gas and Particulate Science Division by R. B. Marinenko and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

Nitric oxide concentration: /itmole/mole (ppm)

Cylinder Number: Sample Number:

(over)

97
Analysis

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of

intercomparison utilized the chemiluminescent reaction of nitric oxide with ozone.

Representative samples have been analyzed for the presence of other nitrogen oxides by passing the sample

through a high-temperature catalytic furnace which converts these other oxides to nitric oxide if present. Under

the conditions of the experiment a minimum of one percent of other oxides would have been detected. No other

oxides of nitrogen were detected in the samples analyzed within the stated limits.

Stability

Loss of nitric oxide by adsorption on the container walls may occur in new cylinders not previously used for

nitric oxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders.

The use of this preconditioning procedure may result in desorption of nitric oxide from the cylinder walls when

the cylinder pressure is reduced to near ambient. To study this effect the pressure in some cylinders has been

reduced stepwise from 13.7 to 2.8 MPa (2000-400 psi). No change in concentration was observed at the lower

pressures or after the samples had been at 2.8 MPA (400 psi) for seven weeks. // is not recommended that the

sample be usedfor accurate analyses at cylinder pressures below 2.8 MPa (400 psi).

The concentration on the certificate is valid for two years from the date of shipment from NBS. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within two years the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders

conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1683b

98
U. S. Department of Commerce

Philip M» Klutznick pecmary?

National Bursa* o( Standards

Ernest ^rnbter. Director

Rational ^xxttrnx of jiiattdartte

Certificate of JVttal|j«te

Standard Reference Material 1684b

Nitric Oxide in Nitrogen

(Nominal Concentration 100 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

oxides of nitrogen in mobile-source emissions. It is not intended as a working standard, but rather t » primary

standard to which the concentration of other standards may be related.

The concentration of nitric oxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitric oxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

CAUTION: Every precaution must be taken to avoid accidental contamination of the sample with atmospheric air during connection of the cylinder to any gas handling system.

The original development and evaluation of the nitric oxide in nitrogen series of Standard Reference Materials

was performed in the Gas and Particulate Science Division by R. B. Marinenko and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

Nitric oxide concentration: ^mole/mole (ppm)

Cylinder Number: Sample Number:

(over)

99
Analysis

The nitric oxide content of this Standard Reference Material was determined by comparison with "condary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of

intercomparison utilized the chemiluminescent reaction of nitric oxide with ozone.

Representative samples have been analyzed for the presence of other nitrogen oxides by passing the sample

through a high-temperature catalytic furnace which converts these other oxides to nitric oxide if present. Under

the conditions of the experiment a minimum of one percent of other oxides would have been detected. No other

oxides of nitrogen were detected in the samples analyzed within the stated limits.

Stability

Loss of nitric oxide by adsorption on the container walls may occur in new cylinders not previously used for

nitric oxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders.

The use of this preconditioning procedure may result in desorption of nitric oxide from the cylinder walls when

the cylinder pressure is reduced to near ambient. To study this effect the pressure in some cylinders has been

reduced stepwise from 13.7 to 2.8 MPa (2000-400 psi). No change in concentration was observed at the lower

pressures or after the samples had been at 2.8 MPA (400 psi) for seven weeks. It is not recommended that the

sample be usedfor accurate analyses at cylinder pressures below 2.8 MPa (400 psi).

The concentration on the certificate is valid for two years from the date of shipment from NBS. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within two years the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders

conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1684b

100
U. S. Department of Commerce

Philip M. KJutznick

Secretary

National Bureau of Standards

Ernest Ambler, Director

of ^tamtards

Certificate of ^Vital^si*

Standard Reference Material 1685b

Nitric Oxide in Nitrogen

(Nominal Concentration 250 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

oxides of nitrogen in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of other standards may be related.

Nitric oxide concentration: ± /xmole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of nitric oxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitric oxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

CAUTION: Every precaution must be taken to avoid accidental contamination of the sample with atmospheric air during connection of the cylinder to any gas handling system.

The original development and evaluation of the nitric oxide in nitrogen series of Standard Reference Materials

was performed in the Gas and Particulate Science Division by R. B. Marinenko and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

(over)

101
Analysis

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of

intercomparison utilized the chemiluminescent reaction of nitric oxide with ozone.

Representative samples have been analyzed for the presence of other nitrogen oxides by passing the sample

through a high-temperature catalytic furnace which converts these other oxides to nitric oxide if present. Under

the conditions of the experiment a minimum of one percent of other oxides would have been detected. No other

oxides of nitrogen were detected in the samples analyzed within the stated limits.

Stability

Loss of nitric oxide by adsorption on the container walls may occur in new cylinders not previously used for

nitric oxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders.

The use of this preconditioning procedure may result in desorption of nitric oxide from the cylinder walls when

the cylinder pressure is reduced to near ambient. To study this effect the pressure in some cylinders has been

reduced stepwise from 13.7 to 2.8 MPa (2000-400 psi). No change in concentration was observed at the lower

pressures or after the samples had been at 2.8 MPA (400 psi) for seven weeks. // is not recommended that the

sample be usedfor accurate analyses at cylinder pressures below 2.8 MPa (400 psi).

The concentration on the certificate is valid for two years from the date of shipment from NBS. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within two years the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders

conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1685b

102
U. S. Department of Commerce

Philip M. Klutznick

Secretary

National Bureau of Standard!

Ernest Ambler, Director

Rational f&mtm of j§>tantlartte

Certificate of ^nal^i*

Standard Reference Material 1686b

Nitric Oxide in Nitrogen

(Nominal Concentration 500 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

oxides of nitrogen in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of other standards may be related.

Nitric oxide concentration: ± /^mole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of nitric oxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitric oxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

CAUTION: Every precaution must be taken to avoid accidental contamination of the sample with atmospheric air during connection of the cylinder to any gas handling system.

The original development and evaluation of the nitric oxide in nitrogen series of Standard Reference Materials

was performed in the Gas and Particulate Science Division by R. B. Marinenko and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

(over)

103
Analysis

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of

intercomparison utilized the chemiluminescent reaction of nitric oxide with ozone.

Representative samples have been analyzed for the presence of other nitrogen oxides by passing the sample

through a high-temperature catalytic furnace which converts these other oxides to nitric oxide if present. Under

the conditions of the experiment a minimum of one percent of other oxides would have been detected. No other

oxides of nitrogen were detected in the samples analyzed within the stated limits.

Stability

Loss of nitric oxide by adsorption on the container walls may occur in new cylinders not previously used for

nitric oxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders.

The use of this preconditioning procedure may result in desorption of nitric oxide from the cylinder walls when

the cylinder pressure is reduced to near ambient. To study this effect the pressure in some cylinders has been

reduced stepwise from 13.7 to 2.8 MPa (2000-400 psi). No change in concentration was observed at the lower

pressures or after the samples had been at 2.8 MPA (400 psi) for seven weeks. // is not recommended that the

sample be usedfor accurate analyses at cylinder pressures below 2.8 MPa (400 psi).

The concentration on the certificate is valid for two years from the date of shipment from NBS. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within two years the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders

conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1686b

104
U. S. Department of Commerce

Philip M. KJutznick

Secretary

National Bureau of Standards

Ernest Ambler, Director

Rational ^mtnn of jltamlartfe

Certificate of ^nal|)«i«

Standard Reference Material 1687b

Nitric Oxide in Nitrogen

(Nominal Concentration 1000 ppm)

(Mobile-Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

oxides of nitrogen in mobile-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of other standards may be related.

Nitric oxide concentration: ± /xmole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of nitric oxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitric oxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

CAUTION: Every precaution must be taken to avoid accidental contamination of the sample with atmospheric air during connection of the cylinder to any gas handling system.

The original development and evaluation of the nitric oxide in nitrogen series of Standard Reference Materials

was performed in the Gas and Particulate Science Division by R. B. Marinenko and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

(over)

105
Analysis

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of

intercomparison utilized the chemiluminescent reaction of nitric oxide with ozone.

Representative samples have been analyzed for the presence of other nitrogen oxides by passing the sample

through a high-temperature catalytic furnace which converts these other oxides to nitric oxide if present. Under

the conditions of the experiment a minimum of one percent of other oxides would have been detected. No other

oxides of nitrogen were detected in the samples analyzed within the stated limits.

Stability

Loss of nitric oxide by adsorption on the container walls may occur in new cylinders not previously used for

nitric oxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders.

The use of this preconditioning procedure may result in desorption of nitric oxide from the cylinder walls when

the cylinder pressure is reduced to near ambient. To study this effect the pressure in some cylinders has been

reduced stepwise from 13.7 to 2.8 MPa (2000-400 psi). No change in concentration was observed at the lower

pressures or after the samples had been at 2.8 MPA (400 psi) for seven weeks. // is not recommended that the

sample be usedfor accurate analyses at cylinder pressures below 2.8 MPa (400 psi).

The concentration on the certificate is valid for two years from the date of shipment from NBS. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within two years the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders

conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 1687b

106
U. S. Departrtt^myof Commerce

Malcoln^Jtaldrige rig

Ernest

National luraafcof ! itandirds ^mMpr^y"tct<

Rational ^nttnn of j^tantbtrtb

(fltttxiit&tt of ^nal^sn

Standard Reference Material 1693a

Sulfur Dioxide in Nitrogen

(Nominal Concentration 50 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of sulfur

dioxide emitted from stationary sources. It is not intended as a working standard, but rather as a primary standard to

which the concentration of other standards may be related. Each cylinder is individually analyzed and the concentration

that appears below applies to the cylinder identified on this certificate.

Sulfur dioxide concentration: ± /imole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of sulfur dioxide is relative to all other constituents ofthe gas. The uncertainty shown is the estimated

upper Umit of error of the sulfur dioxide concentration. This uncertainty includes the imprecision of the intercomparisons at the 95 percent confidence level and the inaccuracy in the peroxide method, including the measurement of

volume and the standardization of the reagent solution.

The original development and evaluation of the sulfur dioxide in nitrogen series of Standard Reference Materials was

performed at the National Bureau of Standards by W. P. Schmidt and E. R. Deardorff.

The overall direction and coordination oftechnical measurements leading to certification were performed in the Gas and

Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Gaithersburg, MD 20899 Stanley D. R isberry, Chief

July 20, 1984 Office of Standard Reference Materials

(Revision of Certificate

dated March 20, 1981)

(over)

107
Certification Information

The cylinder identified in this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

which is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for sulfur dioxide content.

Analysis:

The sulfur dioxide content of this Standard Reference Material was determined by comparison with a set of NBS

primary standards. The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity detector and /or a non-dispersive infrared analyzer. The primary standards were analyzed by the hydrogen

peroxide method which is considered to be inherently accurate in the concentration range of this SRM. This has been

confirmed by the gravimetric determination of sulfur dioxide in samples previously analyzed by the peroxide method.

The gravimetric method was evaluated by analyzing sulfuric acid standards prepared volumetrically. No evidence of a

systematic error in the peroxide method has been observed.

Stability:

This SRM is contained in an aluminum cylinder. Samples of sulfur dioxide in nitrogen in similar containers have been

periodically analyzed over a period of two years and no change in concentration has been observed.

The value appearing on this certificate is valid for two years from the date of purchase. Periodic reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within the two-year period,

purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of approximately 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA/660 valves.

The cylinders become the property of the purchaser.

SRM 1693a

108
U. S. Dcpartm$rif4>f Commerce

Malcolnfc&aldr ige

National lurwteol"Standards

Ernest lAmbfcr, Director

Rational bureau xA ji»tandartte

(Eerttfttate of (Analysts

Standard Reference Material 1694a

Sulfur Dioxide in Nitrogen

(Nominal Concentration 100 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of sulfur

dioxide emitted from stationary sources. It is not intended as a working standard, but rather as a primary standard to

which the concentration of other standards may be related. Each cylinder is individually analyzed and the concentration

that appears below applies to the cylinder identified on this certificate.

The concentration of sulfur dioxide is relative to all other constituents of the gas. The uncertainty shown is the estimated

upper limit of error of the sulfur dioxide concentration; This uncertainty includes the imprecision of the intercomparisons at the 95 percent confidence level and the inaccuracy in the peroxide method, including the measurement of

volume and the standardization of the reagent solution.

The original development and evaluation of the sulfur dioxide in nitrogen series of Standard Reference Materials was

performed at the National Bureau of Standards by W. P. Schmidt and E. R. Deardorff.

The overall direction and coordination of technical measurements leading to certification were performed in the Gas and

Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Sulfur dioxide concentration: ± /xmole / mole (ppm)

Cylinder Number: Sample Number:

Gaithersburg, MD 20899

July 20, 1984

(Revision of Certificate

dated March 20, 1981)

Stanley D. Rasberry, Chief

Office of Standard Reference Materials

(over)

109
Certification Information

The cylinder identified in this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

which is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for sulfur dioxide content.

Analysis:

The sulfur dioxide content of this Standard Reference Material was determined by comparison with a set of NBS

primary standards. The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity detector and /or a non-dispersive infrared analyzer. The primary standards were analyzed by the hydrogen

peroxide method which is considered to be inherently accurate in the concentration range of this SRM. This has been

confirmed by the gravimetric determination of sulfur dioxide in samples previously analyzed by the peroxide method.

The gravimetric method was evaluated by analyzing sulfuric acid standards prepared volumetrically. No evidence of a

systematic error in the peroxide method has been observed.

Stability:

This SRM is contained in an aluminum cylinder. Samples of sulfur dioxide in nitrogen in similar containers have been

periodically analyzed over a period of two years and no change in concentration has been observed.

The value appearing on this certificate is valid for two years from the date of purchase. Periodic reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within the two-year period,

purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of approximately 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m

3 (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA/660 valves.

The cylinders become the property of the purchaser.

SRM 1694a

110
U. S. DcpartrtifrU^f Commerce

MaIcolnt^Saldnge

National Emeu

luraai tanoardi

rector

Rational JSurcau of ^tattdartte

(Eerttfttat* of ^nalt»te

Standard Reference Material 1696

Sulfur Dioxide in Nitrogen

(Nominal Concentration 3500 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of sulfur

dioxide emitted from stationary sources. It is not intended as a working standard, but rather as a primary standard to

which the concentration of other standards may be related. Each cylinder is individually analyzed and the concentration

that appears below applies to the cylinder identified on this certificate.

Sulfur dioxide concentration:

Cylinder Number:

/.mole/ mole (ppm)

Sample Number.

The concentration of sulfur dioxide is relative to all other constituents ofthe gas. The uncertainty shown is the estimated

upper limit of error of the sulfur dioxide concentration. This uncertainty includes the imprecision of the intercomparisons at the 95 percent confidence level and the inaccuracy in the peroxide method including the measurement of

volume and the standardization of the reagent solution.

The original development and evaluation of the sulfur dioxide in nitrogen series of Standard Reference Materials was

performed at the National Bureau of Standards by W. P. Schmidt and E. R. Deardorff.

The overall direction and coordination oftechnical measurements leading to certification were performed in the Oat and

Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

March 20, 1 98 1 Office of Standard Reference Materials

(over)

111
Certification Information

The cylinder identified in this certificate is one of a group or "lot* of cylinders. A lot contains a minimum of 26 cylinders

which is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for sulfur dioxide content.

Analysis:

The sulfur dioxide content of this Standard Reference Material was determined . by comparison with a set of NBS

primary standards. The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity detector and/ or a non-dispersive infrared analyzer. The primary standards were analyzed by the hydrogen

peroxide method which is considered to be inherently accurate in the concentration range of this SRM. This has been

confirmed by the gravimetric determination of sulfur dioxide in samples previously analyzed by the peroxide method.

The gravimetric method was evaluated by analyzing sulfuric acid standards prepared volumetrically. No evidence of a

systematic error in the peroxide method has been observed.

Stability:

This SRM is contained in an aluminum cylinder. Samples of sulfur dioxide in nitrogen in similar containers have been

periodically analyzed over a period of two years and no change in concentration has been observed.

The value appearing on this certificate is valid for two years from the latest date stamped on this certificate. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed

within the two-year period, purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of approximately 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m

3 (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA/660 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 1696

112
V . 4

J. S. Dep»nmertt ^f Commerce

MaleIcolor&aldrigc

'SeoeUryi'

National lur*** oT! iundardt Emctt Umblfr. Director

Rational JSureau tti j&tanriartte

(Uttiiixtntt of ^nnl]jzxz

Standard Reference Material 1696

Sulfur Dioxide in Nitrogen

(Nominal Concentration 3500 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of sulfur

dioxide emitted from stationary sources. It is not intended as a working standard, but rather as a primary standard to

which the concentration of other standards may be related. Each cylinder is individually analyzed and the concentration

that appears below applies to the cylinder identified on this certificate.

Sulfur dioxide concentration:

Cylinder Number

/xmole/ mole (ppm)

Sample Number.

The concentration of sulfur dioxide is relative to all other constituents ofthe gas. The uncertainty shown is the estimated

upper limit of error of the sulfur dioxide concentration. This uncertainty includes the imprecision of the intercomparisons at the 95 percent confidence level and the inaccuracy in the peroxide method including the measurement of

volume and the standardization of the reagent solution.

The original development and evaluation of the sulfur dioxide in nitrogen series of Standard Reference Materials was

performed at the National Bureau of Standards by W. P. Schmidt and E. R. Deardorff.

The overall direction and coordination of technical measurements leading to certification were performed in the Oas and

Particulate Science Division under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

March 20, 1981 Office of Standard Reference Materials

(over)

113
Certification Information

The cylinder identified in this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

which is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for sulfur dioxide content.

Analysis:

The sulfur dioxide content of this Standard Reference Material was determined by comparison with a set of NBS

primary standards. The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity detector and/ or a non-dispersive infrared analyzer. The primary standards were analyzed by the hydrogen

peroxide method which is considered to be inherently accurate in the concentration range of this SRM. This has been

confirmed by the gravimetric determination of sulfur dioxide in samples previously analyzed by the peroxide method.

The gravimetric method was evaluated by analyzing sulfuric acid standards prepared volumetrically. No evidence of a

systematic error in the peroxide method has been observed.

Stability:

This SRM is contained in an aluminum cylinder. Samples of sulfur dioxide in nitrogen in similar containers have been

periodically analyzed over a period of two years and no change in concentration has been observed.

The value appearing on this certificate is valid for two years from the latest date stamped on this certificate. Periodic

reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed

within the two-year period, purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at a pressure of approximately 12.4 MPa (1800 psi) with a deliverable volume of

0.88 m

3 (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA/660 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 1696

114
U. S. DepartmfcSdi'Sf Commerce

Malcolnfr&aldrige

National BuSka!"! iundardl

Ernett lAmblpr, Director

Rational ^wreau of j&attttartte

Certificate of JVttaltwi*

Standard Reference Material 1805

Benzene in Nitrogen

(Nominal Concentration 0.25 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the determination of

benzene in stationary-source emissions. It is not intended as a working standard, but rather as a primary standard to

which the concentration of the daily working standards may be related.

The concentration of benzene is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the benzene concentration at the 95% confidence level. This uncertainty includes the inaccuracy in the

concentration of benzene in gravimetrically prepared primary standards and the imprecision of intercomparison with

these primary standards. This sample is certified only for the concentration of benzene. However, representative

samples from the lot have been examined for the presence of other hydrocarbons. The estimated concentration of other

hydrocarbons, expressed as benzene, is /i mole/ mole (ppm).

Each cylinder was individually analyzed and the concentration appearing above applies only to the cylinder with identification number corresponding to the one on this certificate.

Stability and Precautions: See reverse side of this certificate.

The original development and evaluation of the benzene in nitrogen series of Standard Reference Materials were performed in the Gas and Particulate Science Division by W.P. Schmidt and W.F. Cuthrell.

The overall direction and coordination of technical measurements leading to certification were performed under the

chairmanship of H.L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by R. Alvarez.

Washington, D.C. 20234 George A. Uriano, Chief

December 27, 1 982 (over) Office of Standard Reference Materials

Benzene concentration: /zmole/ mole (ppm)

Cylinder Number: Sample Number:

115
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that it is homogeneous and stable. Each cylinder in the

lot is individually analyzed at NBS for benzene content.

Analysis

The concentration of benzene in this Standard Reference Material was determined by comparison with a set of gravimetric standards and with a calibrated benzene permeation system. The intercomparisons were performed using a gas

chromatograph equipped with a flame ionization detector.

Stability and Precautions

This SRM is contained in an aluminum cylinder. The stability of the gas mixture is considered good and no decrease in

concentration has been observed in similar samples contained in aluminum cylinders. However, two precautions should

be observed in using this SRM for accurate analyses.

1. Cylinder control valves should be used instead of regulators to sample from the high pressure gas cylinders and

these valves should be conditioned by passing at least one liter of the SRM through the valve prior to actual sampling.

2. The delivered concentration of benzene from the cylinder increases as the cylinder pressure approaches ambient

pressure. Therefore the SRM should not be used below a cylinder pressure of 2.8 MPa (400 psi).

The value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year

period, purchasers of the SRM will be notified.

Cylinder

This S R M is supplied in cylinders at a pressure of 1 2.4 M Pa ( 1 800 psi) with a deliverable volume of 0.88 m

3 (3 1 cubic feet)

at SI P. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

116
U. S. Departrhjrit of Commerce

Malcolm -Bald rige "Secretary!

7

Rational f&nttnn of Jitanrlartfe

Certificate of ^Vnalgst*

Standard Reference Material 1806

Benzene in Nitrogen

(Nominal Concentration 10 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the determination of

benzene in stationary-source emissions. It is not intended as a working standard, but rather as a primary standard to which the concentration of the daily working standards may be related.

The concentration of benzene is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the benzene concentration at the 95% confidence level. This uncertainty includes the inaccuracy in the

concentration of benzene in gravimetrically prepared primary standards and the imprecision of intercomparison with

these primary standards. This sample is certified only for the concentration of benzene. However, representative

samples from the lot have been examined for the presence of other hydrocarbons. The estimated concentration of other

hydrocarbons, expressed as benzene, is jumole/mole (ppm).

Each cylinder was individually analyzed and the concentration appearing above applies only to the cylinder with identification number corresponding to the one on this certificate.

Stability and Precautions: See reverse side of this certificate.

The original development and evaluation of the benzene in nitrogen series of Standard Reference Materials were performed in the Gas and Particulate Science Division by W.P. Schmidt and W.F. Cuthrell.

The overall direction and coordination of technical measurements leading to certification were performed under the

chairmanship of H.L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by R. Alvarez.

Washington, D.C. 20234 George A. Uriano, Chief

December 27, 1982 (over) Office of Standard Reference Materials

Benzene concentration: + jumole/ mole (ppm)

Cylinder Number: Sample Number:

117
Certification Information

The cylinder identified on this certificate is one of a group or"lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that it is homogeneous and stable. Each cylinder in the

lot is individually analyzed at NBS for benzene content.

Analysis

The concentration of benzene in this Standard Reference Material was determined by comparison with a set of gravimetric standards and with a calibrated benzene permeation system. The intercomparisons were performed using a gas

chromatograph equipped with a flame ionization detector.

Stability and Precautions

This SRM is contained in an aluminum cylinder. The stability of the gas mixture is considered good and no decrease in

concentration has been observed in similar samples contained in aluminum cylinders. However, two precautions should

be observed in using this SRM for accurate analyses.

1. Cylinder control valves should be used instead of regulators to sample from the high pressure gas cylinders and

these valves should be conditioned by passing at least one liter of the SRM through the valve prior to actual sampling.

2. The delivered concentration of benzene from the cylinder increases as the cylinder pressure approaches ambient

pressure. Therefore the SRM should not be used below a cylinder pressure of 2.8 MPa (400 psi).

The value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year

period, purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31 cubic feet)

at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards lor disposal.

118
U. S. Departrt^ifH^f Commerce

MMCojwgaldrige

National

Ernest iundards

irector

Rational bureau of j^tandartte

Certificate of ^ttaltjst*

Standard Reference Material 1808

Tetrachloroethylene in Nitrogen

(Nominal Concentration 0.25 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material (SRM) is intended for use in the calibration of instruments used for the determination

of tetrachloroethylene in stationary-source emissions. It is not intended as a working standard, but rather as a primary

standard to which the concentration of daily working standards may be related.

The concentration of tetrachloroethylene is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the tetrachloroethylene concentration at the 95% confidence level. This uncertainty

includes the inaccuracy of the concentration of tetrachloroethylene in gravimetric primary standards and the imprecision

of intercomparison with these primary standards. This SRM is certified only for the concentration of tetrachloroethylene. However, representative samples from the lot have been examined for the presence of other hydrocarbons. The

estimated concentration of other hydrocarbons, expressed as tetrachloroethylene, is /imole/mole (ppm).

Each cylinder of gas is individually analyzed and the concentration appearing above applies only to the cylinder

identified by cylinder number and sample number on this certificate.

Stability and Precautions: See reverse side of this certificate.

The original development and evaluation of the tetrachloroethylene in nitrogen series of Standard Reference Materials were performed in the Gas and Particulate Science Division by W.P. Schmidt and W.F. Cuthrell.

The overall direction and coordination of technical measurements leading to certification were performed under the

chairmanship of H.L. Rook, Chief, Gas and Particulate Science Division.

Support for measurement research and standard development was provided by the Quality Assurance Division,

Environmental Monitoring and Support Laboratory, USEPA.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by R. Alvarez.

Washington, D.C. 20234 Stanley D. Rasberry, Chief

June 13, 1983 Office of Standard Reference Materials

Tetrachloroethylene concentration:

Cylinder Number: Sample Number:

± //mole / mole (ppm)

(over)

119
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that it is homogeneous and stable. Each cylinder in the

lot is individually analyzed at NBS for tetrachloroethylene content.

Analysis

The concentration of tetrachloroethylene in this SRM was determined by comparison with a set of gravimetric

standards. The intercomparisons were performed using a gas chromatograph equipped with a flame ionization detector.

Stability and Precautions

This SRM is contained in an aluminum cylinder. The stability of the gas mixture is considered good and no decrease in concentration has been observed in similar samples contained in aluminum cylinders. However, the following precaution should be observed when using this SRM for accurate analyses: Cylinder control valves should be used instead

of regulators to sample from the high pressure gas cylinders and these valves should be conditioned by passing at least

four liters of the SRM through the valve prior to actual sampling.

The certification of this SRM is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year period,

purchasers of the SRM will be notified.

Cylinder

This SR M is supplied in cylinders at a pressure of 1 2.4 M Pa ( 1 800 psi) with a deliverable volume of 0.72 m

3 (25 cubic feet)

at STP. The cylinders conform to DOT specifications and are eqipped with CGA-350 valves.

The cylinders become the property of the purchasers.

120
U. S. DepartrilfefK:?&f Commerce

Malcoli&fialdrige TJewyStryf

National finM^of ! standards Ernest lAmbirr, Director

Rational ^mmn of j^tantfortte

GLtttxixtntt of (Attaint*

Standard Reference Material 1809

Tetrachloroethylene in Nitrogen

(Nominal Concentration 10 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material (SRM) is intended for use in the calibration of instruments used for the determination of tetrachloroethylene in stationary-source emissions. It is not intended as a working standard, but rather as a primary standard to which the concentration of the daily working standards may be related.

The concentration of tetrachloroethylene is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the tetrachloroethylene concentration at the 95% confidence level. This uncertainty

includes the uncertainty in the concentration of tetrachloroethylene in gravi metrically prepared primary standards and

the imprecision of the intercomparison of the primary standards with the SRM. SRM 1809 is certified only for the

concentration of tetrachloroethylene. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as tetrachloroethylene,

is less than 0.03 pimole/mole (ppm).

Each cylinder of gas was individually analyzed and the concentration appearing above applies only to the cylinder

identified by the cylinder number and the sample number on this certificate.

Stability and Precautions: See reverse side of this certificate.

The original development and evaluation of this tetrachloroethylene in nitrogen SRM were performed in the Gas and

Particulate Science Division by W. P. Schmidt and W. F. Cuthrell.

The overall direction and coordination of technical measurements leading to certification were performed under the

chairmanship of H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by R. Alvarez.

Washington, DC 20234 Stanley D. Rasberry, Chief

December 12, 1983 Office of Standard Reference Materials

Tetrachloroethylene concentration:

Cylinder Number: Sample Number:

jumole / mole (ppm)

(over)

121
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that it is homogeneous and stable. The tetrachloroethylene content of each cylinder in the lot has been individually determined at NBS.

Analysis

The concentration of tetrachloroethylene in this SRM was determined by comparison with a set of gravimetrically

prepared primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability and Precautions

This SRM is contained in an aluminum cylinder. The stability of the gas mixture is considered good and no decrease in

concentration has been observed in similar samples contained in aluminum cylinders. However, two precautions should

be observed when using this SRM for accurate analyses.

1. A cylinder control valve should be used instead of a regulator when sampling from the high pressure gas cylinder

and the valve should be conditioned by passing at least one liter of the SRM through the valve prior to actual

sampling.

2. The SRM should not be used when the cylinder pressure is below 1.4 MPa (200 psi). At low pressure (<200 psi) the

concentration of tetrachloroethylene may change.

The value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses

of representative samples from this lot will be performed at NBS, and if significant changes in the certified value are observed within the 2 year period, purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in a cylinder at a pressure of 10.3 MPa (1500 psi) with a deliverable volume of 0.60 m

3 (20 cubic

feet) at STP. The cylinder conforms to DOT specifications and is equipped with a CGA-350 valve.

The cylinder becomes the property of the purchaser.

122
. S. Departrii^rkfof Commerce

MalcolnrSaldrige Secretary <

National Bureau ol Standard] Emeu lAmbter. Director Rational ^nxmn of Standards

Certificate of (Analysis

Standard Reference Material 1811

Benzene, Toluene, Chlorobenzene, and Bromobenzene

in Nitrogen

(Nominal Concentration, 0.25 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material (SRM) is intended for use in the calibration of instruments used for the determination of volatile aromatic hydrocarbons (benzene, toluene, chlorobenzene and bromobenzene) in stationary-source

emissions. SRM 181 1 consists ofa mixture ofthese hydrocarbons in high purity nitrogen. This SRM is not intended as a working standard but rather as a primary standard to which the concentrations of the daily working standards may be

related. The certified concentration of each hydrocarbon and its associated uncertainty is given below.

The certified concentration of each of these four aromatic hydrocarbons is relative to all other constituents of the gas

mixture. The uncertainty shown is the estimated upper limit of error of each hydrocarbon concentration at the 95%

confidence level and this uncertainty includes the estimated uncertainty in the gravimetric preparation of standards of

this mixture, the analytical imprecision in comparing the gravimetric standards to a sample that was randomly selected

from a homogeneously prepared batch ofthese SRM's (batch standard), and the analytical imprecision in comparing the

batch standard to the rest of the samples in the batch. This SRM is certified only for the concentration of the four

hydrocarbons listed above.

Each cylinder in this batch was individually analyzed and the concentration appearing above applies only to the cylinder

number and sample number identified on this certificate.

Stability and Precautions: See reverse side of this certificate.

The original development and evaluation of this Standard Reference Material were performed in the Gas and Particulate

Science Division by W.F. Cuthrell.

The overall direction and coordination of technical measurements leading to certification were performed under the

chairmanship of W.L. Zielinski, Jr. and H.L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

Benzene:

Toluene:

Chlorobenzene:

Bromobenzene:

±

±

umole/ mole (ppm)

/umole/ mole (ppm)

jumole/ mole (ppm)

jumole/mole (ppm)

Cylinder Number: Sample Number:

Gaithersburg, MD 20899

November 18, 1985

(Over)

123

Stanley D. Rasberry, Chief

Office of Standard Reference Materials
Certification Information

The cylinder identified on this certificate is one of a group or "batch" of cylinders that were prepared commercially

according to rigid technical specifications to ensure homogeneity and stability. Each cylinder in the batch was

individually analyzed at NBS for the contents of benzene, toluene, chlorobenzene, and bromobenzene.

Analysis

The certified concentration of each of the aromatic hydrocarbons in this SRM was determined by comparison to a set of gravimetric standards. The concentration of benzene in this SRM also was analytically compared to SRM 1805,

Benzene in Nitrogen (0.25 ppm). The intercomparisons were performed using a gas chromatograph equipped with a flame ionization detector. Typical analyses used a gas sampling valve and a chromatographic column, such as a 305 cm

(10 ft) by 0.32 cm (1 / 8 inch) stainless steel column packed with 20% SP-2100 and 0.1% Carbowax 1500 on 100-120 mesh

Supelcoport, operated at a column temperature of 130 °C and a nitrogen carrier gas flow rate of 50 mL/minute.

Stability and Precautions

This SRM is contained in an aluminum cylinder. The stability of the gas mixture is considered good and no significant

decreases in concentrations have been observed with time. However, two precautions should be observed in using this

SRM to obtain accurate analyses.

1. Cylinder control valves should be used instead of regulators to sample from the high pressure gas cylinder

represented by this SRM, and these valves should be conditioned by passing at least one liter ofthe SRM through the

valve prior to actual sampling.

2. The SRM should not be used below a cylinder pressure of 2.8 MPa (400 psi).

The concentration values appearing on this certificate are considered valid within the stated limits of uncertainty for

2 years from date of purchase. Periodic reanalyses of representative samples from this batch will be performed at NBS,

and if statistically significant changes are observed within the 2 year period, purchasers ofthis SRM will be notified. This

SRM may be returned to NBS for recertification at the discretion of the user to extend the certification period.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31 cubic

feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned prepaid, to the National Bureau of

Standards for disposal

Note

Trade names are mentioned in this certificate only for sake oftechnical clarity. This mention does not imply any endorsement of commercial products by the National Bureau of Standards.

Page 2

SRM 1811

124
U. S. Department 'of Commerce

MalcolnrBaldrigc SecretaryNational Bureau oTStandards

Ernest Ambter, Director

Standard Reference Material 1812

Benzene, Toluene, Chlorobenzene, and Bromobenzene

in Nitrogen

(Nominal Concentration, 10.0 ppm)

(Stationary. Source Emission Gas Standard)

This Standard Reference Material (SRM) is intended for use in the calibration of instruments used for the determination of volatile aromatic hydrocarbons (benzene, toluene, chlorobenzene and bromobenzene) in stationary-source

emissions. SRM 18 12 consists of a mixture of these hydrocarbons in high purity nitrogen. This SRM is not intended as a working standard but rather as a primary standard to which the concentrations of the daily working standards may be

related. The certified concentration of each hydrocarbon and its associated uncertainty is given below.

The certified concentration of each of these four aromatic hydrocarbons is relative to all other constituents of the gas

mixture. The uncertainty shown is the estimated upper limit of error of each hydrocarbon concentration at the 95%

confidence level and this uncertainty includes the estimated uncertainty in the gravimetric preparation of standards of

this mixture, the analytical imprecision in comparing the gravimetric standards to a sample that was randomly selected

from a homogeneously prepared batch ofthese SRM's (batch standard), and the analytical imprecision in comparing the

batch standard to the rest of the samples in the batch. This SRM is certified only for the concentration of the four

hydrocarbons listed above.

Each cylinder in this batch was individually analyzed and the concentration appearing above applies only to the cylinder

number and sample number identified on this certificate.

Stability and Precautions: See reverse side of this certificate.

The original development and evaluation of this Standard Reference Material were performed in the Gas and Particulate

Science Division by W.F. Cuthrell.

The overall direction and coordination of technical measurements leading to certification were performed under the

chairmanship of W.L. Zielinski, Jr. and H.L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

Benzene:

Toluene:

Chlorobenzene:

Bromobenzene:

±

jzmole/ mole (ppm)

/umole/ mole (ppm)

/zmole/ mole (ppm)

Htnole I mole (ppm)

Cylinder Number: Sample Number:

Gaithersburg, MD 20899

November 18, 1985

(Over)

125

Stanley D. Rasberry, Chief

Office of Standard Reference Materials
Certification Information

The cylinder identified on this certificate is one of a group or "batch" of cylinders that were prepared commercially

according to rigid technical specifications to ensure homogeneity and stability. Each cylinder in the batch was

individually analyzed at NBS for the contents of benzene, toluene, chlorobenzene, and bromobenzene.

Analysis

The certified concentration of each of the aromatic hydrocarbons in this SRM was determined by comparison to a set of gravimetric standards. The concentration of benzene in this SRM also was analytically compared to SRM 1805,

Benzene in Nitrogen (0.2S ppm). The intcrcomparisons were performed using a gas chromatograph equipped with a

flame ionization detector. Typical analyses used a gas sampling valve and a chromatographic column, such as a 305 cm

(10 ft) by 0.32 cm (1/8 inch) stainless steel column packed with 20% SP-2100 and0.1%Carbowax 1500 on 100-120 mesh

Supelcoport, operated at a column temperature of 130 °C and a nitrogen carrier gas flow rate of 50 mL/ minute.

Stability and Precautions

This SRM is contained in an aluminum cylinder. The stability of the gas mixture is considered good and no significant

decreases in concentrations have been observed with time. However, two precautions should be observed in using this

SRM to obtain accurate analyses.

1. Cylinder control valves should be used instead of regulators to sample from the high pressure gas cylinder

represented by this SRM, and these valves should be conditioned by passing at least one liter ofthe SRM through the

valve prior to actual sampling.

2. The SRM should not be used below a cylinder pressure of 2.8 MPa (400 psi).

The concentration values appearing on this certificate are considered valid within the stated limits of uncertainty for

2 years from date of purchase. Periodic reanalyses of representative samples from this batch will be performed at NBS,

and if statistically significant changes are observed within the 2 year period, purchasers ofthis SRM will be notified. This

SRM may be returned to NBS for recertification at the discretion of the user to extend the certification period.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31 cubic

feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned prepaid, to the National Bureau of

Standards for disposal.

Note

Trade names are mentioned in this certificate only for sake oftechnical clarity. This mention does not imply any endorsement of commercial products by the National Bureau of Standards.

Page 2

SRM 1812

126
S. DepartmirW'of Commerce

MalcolnfeBaldr ige

Rational ^Bureau of j^tattdartfe

Certificate of ^nalysi*

Standard Reference Material 2607

Carbon Dioxide and Nitrous Oxide in Air

(Nominal Concentration 340 ppm C0 2 and 300 ppb N 2 0)

(Atmospheric Standard)

This Standard Reference Material (SRM) is intended for use in the calibration of instruments and the evaluation of

methods used for the measurement of carbon dioxide and nitrous oxide in the atmosphere. It is not intended as a working standard, but rather as a primary laboratory standard, to which the concentration of carbon dioxide and/ or

nitrous oxide in other standards may be related.

Carbon dioxide concentration: ± /imole/mole(ppm)

Nitrous oxide concentration: ± nmole/mole(ppb)

Cylinder Number: Sample Number:

The concentrations of carbon dioxide and nitrous oxide are relative to all other constituents of this gas mixture. The

uncertainties shown are the estimated upper limit of error ofthe carbon dioxide and nitrous oxide concentrations and are the 95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentrations given above apply only to the cylinder identified by

the cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas-handling system.

The research and development leading to the certification of this SRM were performed in the Gas and Particulate

Science Division by E.E. Hughes, J.W. Elkins, R.C. Myers, and P. A. Johnson.

The overall direction and coordination of the technical measurements leading to the certification of this SRM were performed under the chairmanship of W.L. Zielinski, Jr., and H.L. Rook of the Gas and Particulate Science Divison.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

Gaithersburg, MD 20899 Stanley D. Rasberry, Chief

September 3, 1985 Office of Standard Reference Materials

(Over)

127
Analysis

The carbon dioxide and nitrous oxide contents of this Standard Reference Material were determined by comparison to

NBS working standards that had been previously intercompared with a set of primary gravimetric standards. The

method of intercomparison was gas chromatography and /or a nondispersive infrared spectrometric method for carbon

dioxide, and electron capture-gas chromatography and tunable diode laser spectroscopy for nitrous oxide.

Representative samples from this batch of Standard Reference Materials have been analyzed for oxygen, water vapor,

methane, and halocarbons F-l 1 and F-12. The concentrations of components listed in Table 1 are not certified but are given for information only.

Table 1

Component

Oxygen

Water Vapor

Methane

Trichlorofluoromethane (Halocarbon F-1 1)

Dichlorodifluoromethane (Halocarbon F-12)

•maximum

**ppt, parts per trillion

Estimated Concentration

in Samples of this Batch

20.95 mole percent

ppm by mole*

ppm by mole

ppt** by mole

ppt** by mole

Uncertainty

The estimated upper limit of the total uncertainty at 95% confidence for the carbon dioxide concentration of this SRM

does not exceed 0. 1% of its certified value, while that for the nitrous oxide concentration of this SRM does not exceed

1.0% of its certified value. These estimates are based on systematic errors associated with gravimetric standards, the

random errors associated with the comparison of the gravimetric standards to the NBS working standards, and the

comparison of the NBS working standards to the SRM.

A sample from this batch has been independently analyzed for its carbon dioxide concentration by P. Guenther at the

laboratory of Dr. Charles Keeling at the Scripps Institution of Oceanography (SIO) of the University of California,

San Diego. The difference between the carbon dioxide concentration assigned by NBS and that measured by SIO was

not significant considering the uncertainties in the two independent methods employed.

Stability

Measurements have been made of many samples in this batch over time intervals up to 18 months and no evidence has

been found of changes in the concentration of carbon dioxide or in the concentration of nitrous oxide. However, in

several instances, samples from this batch and other batches of carbon dioxide in air have exhibited an increase in

concentration when the cylinder pressure fell to a pressure below 1.04 MPa (150 psi). It is not recommended that the

sample be used as an analytical standard after the pressure has fallen below 2.76 MPa (400 psi).

The concentrations on the certificate are valid for two years from the date of shipment from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS and, if significant changes are observed, the purchasers of

samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of approximately 3.82 m

3 (135 cubic feet) at STP. The

cylinders conform to DOT specifications and are equipped with CGA-660 valves. The cylinder becomes the property of

the purchaser. However, it may be returned, prepaid, to the National Bureau of Standards for reanalysis.

Reanalysis

When this Standard Reference Material is used as a standard in a long-term program of analysis of atmospheric carbon

dioxide, it may be necessary to confirm the original certification during or at the end of the certification period. The

National Bureau of Standards will reanalyze this Standard Reference Material for the original purchaser at a cost not to exceed the cost of similar materials available at the time of the request for reanalysis. The original purchaser should

contact William Dorko, (301) 921-2888, of the Gas and Particulate Science Division of the National Bureau of Standards

to arrange for reanalysis.

SRM 2607

Pace 1

128
Ernest (Amber, Director Rational ££ttrea« of Standards

(Eeritfttate xA Analysts

Standard Reference Material 2608

Carbon Dioxide and Nitrous Oxide in Air

(Nominal Concentration 340 ppm C02 and 300 ppb N

2 0)

(Atmospheric Standard)

This Standard Reference Material (SRM) is intended for use in the calibration of instruments and the evaluation of

methods used for the measurement of carbon dioxide and nitrous oxide in the atmosphere. It is not intended as a working standard, but rather as a primary laboratory standard, to which the concentration of carbon dioxide and /or

nitrous oxide in other standards may be related.

Carbon dioxide concentration: ± /jmole/mole(ppm)

Nitrous oxide concentration: ± nmole /mole(ppb)

Cylinder Number: Sample Number:

The concentrations of carbon dioxide and nitrous oxide are relative to all other constituents of this gas mixture. The

uncertainties shown are the estimated upper limit of error ofthe carbon dioxide and nitrous oxide concentrations and are the 95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentrations given above apply only to the cylinder identified by

the cylinder number and sample,number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use ofthe cylinder with any

gas-handling system.

The research and development leading to the certification of this SRM were performed in the Gas and Particulate

Science Division by E.E. Hughes, J.W. Elkins, R.C. Myers, and P.A. Johnson.

The overall direction and coordination of the technical measurements leading to the certification of this SRM were performed under the chairmanship of W.L. Zielinski, Jr., and H.L. Rook of the Gas and Particulate Science Divison.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

Gaithersburg, MD 20899 Stanley D. Rasberry, Chief

September 3, 1985 Office of Standard Reference Materials

(Over)

129
Analysis

The carbon dioxide and nitrous oxide contents of this Standard Reference Material were determined by comparison to

NBS working standards that had been previously intercompared with a set of primary gravimetric standards. The

method of intercomparison was gas chromatography and /or a nondispersive infrared spectrometric method for carbon

dioxide, and electron capture-gas chromatography and tunable diode laser spectroscopy for nitrous oxide.

Representative samples from this batch of Standard Reference Materials have been analyzed for oxygen, water vapor,

methane, and halocarbons F-l 1 and F-12. The concentrations of components listed in Table 1 are not certified but are given for information only.

Table 1

Component

Oxygen

Water Vapor

Methane

Trichlorofluoromethane (Halocarbon F-l 1)

Dichlorodifluoromethane (Halocarbon F-12)

•maximum

**ppt, parts per trillion

Estimated Concentration

in Samples of this Batch

20.95 mole percent

ppm by mole*

ppm by mole

ppt** by mole

ppt** by mole

Uncertainty

The estimated upper limit of the total uncertainty at 95% confidence for the carbon dioxide concentration of this SRM

does not exceed 0. 1% of its certified value, while that for the nitrous oxide concentration of this SRM does not exceed

1.0% of its certified value. These estimates are based on systematic errors associated with gravimetric standards, the

random errors associated with the comparison of the gravimetric standards to the NBS working standards, and the

comparison of the NBS working standards to the SRM.

A sample from this batch has been independently analyzed for its carbon dioxide concentration by P. Guenther at the

laboratory of Dr. Charles Keeling at the Scripps Institution of Oceanography (SIO) of the University of California,

San Diego. The difference between the carbon dioxide concentration assigned by NBS and that measured by SIO was

not significant considering the uncertainties in the two independent methods employed.

Stability

Measurements have been made of many samples in this batch over time intervals up to 18 months and no evidence has

been found of changes in the concentration of carbon dioxide or in the concentration of nitrous oxide. However, in

several instances, samples from this batch and other batches of carbon dioxide in air have exhibited an increase in

concentration when the cylinder pressure fell to a pressure below 1.04 MPa (150 psi). It is not recommended that the

sample be used as an analytical standard after the pressure has fallen below 2.76 MPa (400 psi).

The concentrations on the certificate are valid for two years from the date of shipment from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS and, if significant changes are observed, the purchasers of

samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of approximately 0.76 m

3 (27 cubic feet) at STP. The

cylinders conform to DOT specifications and are equipped with CGA-660 valves. The cylinder becomes the property of

the purchaser. However, it may be returned, prepaid, to the National Bureau of Standards for reanalysis.

Reanalysis

When this Standard Reference Material is used as a standard in a long-term program of analysis of atmospheric carbon

dioxide, it may be necessary to confirm the original certification during or at the end of the certification period. The

National Bureau of Standards will reanalyze this Standard Reference Material for the original purchaser at a cost not to

exceed the cost of similar materials available at the time of the request for reanalysis. The original purchaser should

contact William Dorko, (301) 921-2888, ofthe Gas and Particulate Science Division of the National Bureau of Standards

to arrange for reanalysis.

SRM 2608

Page 2 130
U. S. DepartmfefW$>f Commerce

Malcolafaftaldrige

Rational J£uram of ji»tamlartte

Certificate of JVnaljjsi*

Standard Reference Material 2609

Carbon Dioxide and Nitrous Oxide in Air

(Nominal Concentration 380 ppm C02 and 330 ppb N 2 0)

(Atmospheric Standard)

This Standard Reference Material (SRM) is intended for use in the calibration of instruments and the evaluation of

methods used for the measurement of carbon dioxide and nitrous oxide in the atmosphere. It is not intended as a working standard, but rather as a primary laboratory standard, to which the concentration of carbon dioxide and /or

nitrous oxide in other standards may be related.

Carbon dioxide concentration: ± ^rnole/ mole(ppm)

Nitrous oxide concentration: ± nmole/mole(ppb)

Cylinder Number: Sample Number:

The concentrations of carbon dioxide and nitrous oxide are relative to all other constituents of this gas mixture. The

uncertainties shown are the estimated upper limit of error of the carbon dioxide and nitrous oxide concentrations and are

the 95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentrations given above apply only to the cylinder identified by

the cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas-handling system.

The research and development leading to the certification of this SRM were performed in the Gas and Particulate

Science Division by E.E. Hughes, J.W. Elkins, R.C. Myers, and P. A. Johnson.

The overall direction and coordination of the technical measurements leading to the certification of this SRM were performed under the chairmanship of W.L. Zielinski, Jr., and H.L. Rook of the Gas and Particulate Science Divison.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

Gaithersburg, MD 20899 Stanley D. Rasberry, Chief

September 3, 1985 Office of Standard Reference Materials

(Over)

131
Analysis

The carbon dioxide and nitrous oxide contents of this Standard Reference Material were determined by comparison to

NBS working standards that had been previously intercompared with a set of primary gravimetric standards. The

method of intercomparison was gas chromatography and /or a nondispersive infrared spectrometric method for carbon

dioxide, and electron capture-gas chromatography and tunable diode laser spectroscopy for nitrous oxide.

Representative samples from this batch of Standard Reference Materials have been analyzed for oxygen, water vapor,

methane, and halocarbons F-l 1 and F-12. The concentrations of components listed in Table 1 are not certified but are given for information only.

Table 1

Component

Oxygen

Water Vapor

Methane

Trichlorofluoromethane (Halocarbon F-l 1)

Dichlorodifluoromethane (Halocarbon F-12)

•maximum

**ppt, parts per trillion

Estimated Concentration

in Samples of this Batch

20.95 mole percent

ppm by mole*

ppm by mole

ppt** by mole

ppt** by mole

Uncertainty

The estimated upper limit of the total uncertainty at 95% confidence for the carbon dioxide concentration of this SRM

does not exceed 0. 1% of its certified value, while that for the nitrous oxide concentration of this SRM does not exceed

1.0% of its certified value. These estimates are based on systematic errors associated with gravimetric standards, the

random errors associated with the comparison of the gravimetric standards to the NBS working standards, and the

comparison of the NBS working standards to the SRM.

A sample from this batch has been independently analyzed for its carbon dioxide concentration by P. Guenther at the

laboratory of Dr. Charles Keeling at the Scripps Institution of Oceanography (SIO) of the University of California,

San Diego. The difference between the carbon dioxide concentration assigned by NBS and that measured by SIO was

not significant considering the uncertainties in the two independent methods employed.

Stability

Measurements have been made of many samples in this batch overtime intervals up to 18 months and no evidence has

been found of changes in the concentration of carbon dioxide or in the concentration of nitrous oxide. However, in

several instances, samples from this batch and other batches of carbon dioxide in air have exhibited an increase in

concentration when the cylinder pressure fell to a pressure below 1.04 MPa (150 psi). It is not recommended that the

sample be used as an analytical standard after the pressure has fallen below 2.76 MPa (400 psi).

The concentrations on the certificate are valid for two years from the date of shipment from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS and, if significant changes are observed, the purchasers of

samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of approximately 3.82 m

3 (135 cubic feet) at STP. The

cylinders conform to DOT specifications and are equipped with CGA-660 valves. The cylinder becomes the property of

the purchaser. However, it may be returned, prepaid, to the National Bureau of Standards for reanalysis.

Reanalysis

When this Standard Reference Material is used as a standard in a long-term program of analysis of atmospheric carbon

dioxide, it may be necessary to confirm the original certification during or at the end of the certification period. The

National Bureau of Standards will reanalyze this Standard Reference Material for the original purchaser at a cost not to

exceed the cost of similar materials available at the time of the request for reanalysis. The original purchaser should

contact William Dorko, (301) 921-2888, of the Gas and Particulate Science Division of the National Bureau of Standards

to arrange for reanalysis.

SRM 2609

Page 2 132
U. S. DepartimriM>f Commerce

MalcolnWttaldrige

Rational Jumu of j^tandartte

Certificate of JVttaltrai*

Standard Reference Material 2610

Carbon Dioxide and Nitrous Oxide in Air

(Nominal Concentration 380 ppm CO2 and 330 ppb N2O)

(Atmospheric Standard)

This Standard Reference Material (SRM) is intended for use in the calibration of instruments and the evaluation of

methods used for the measurement of carbon dioxide and nitrous oxide in the atmosphere. It is not intended as a working standard, but rather as a primary laboratory standard, to which the concentration of carbon dioxide and /or

nitrous oxide in other standards may be related.

Carbon dioxide concentration: ± /umole/mole(ppm)

Nitrous oxide concentration: ± nmole/mole(ppb)

Cylinder Number: Sample Number:

The concentrations of carbon dioxide and nitrous oxide are relative to all other constituents of this gas mixture. The

uncertainties shown are the estimated upper limit of error of the carbon dioxide and nitrous oxide concentrations and are the 95 percent confidence interval based on allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentrations given above apply only to the cylinder identified by

the cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas-handling system.

The research and development leading to the certification of this SRM were performed in the Gas and Particulate

Science Division by E.E. Hughes, J.W. Elkins, R.C. Myers, and P.A. Johnson.

The overall direction and coordination of the technical measurements leading to the certification of this SRM were performed under the chairmanship of W.L. Zielinski, Jr., and H.L. Rook of the Gas and Particulate Science Divison.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T.E. Gills.

Gaithersburg, MD 20899 Stanley D. Rasberry, Chief

September 3, 198S Office of Standard Reference Materials

(Over)

133
Analysis

The carbon dioxide and nitrous oxide contents of this Standard Reference Material were determined by comparison to

NBS working standards that had been previously intercom pared with a set of primary gravimetric standards. The

method of intercomparison was gas chromatography and / or a nondispersive infrared spectrometric method for carbon

dioxide, and electron capture-gas chromatography and tunable diode laser spectroscopy for nitrous oxide.

Representative samples from this batch of Standard Reference Materials have been analyzed for oxygen, water vapor,

methane, and halocarbons F-l 1 and F-12. The concentrations of components listed in Table 1 are not certified but are given for information only.

Table 1

Estimated Concentration

Component in Samples of this Batch

Oxygen

Water Vapor

Methane

Trichlorofluoromethane (Halocarbon F-l 1)

Dichlorodifluoromethane (Halocarbon F-12)

•maximum

**ppt, parts per trillion

Uncertainty

The estimated upper limit of the total uncertainty at 95% confidence for the carbon dioxide concentration of this SRM

does not exceed 0. 1% of its certified value, while that for the nitrous oxide concentration of this SRM does not exceed

1.0% of its certified value. These estimates are based on systematic errors associated with gravimetric standards, the

random errors associated with the comparison of the gravimetric standards to the NBS working standards, and the

comparison of the NBS working standards to the SRM.

A sample from this batch has been independently analyzed for its carbon dioxide concentration by P. Guenther at the

laboratory of Dr. Charles Keeling at the Scripps Institution of Oceanography (SIO) of the University of California,

San Diego. The difference between the carbon dioxide concentration assigned by NBS and that measured by SIO was

not significant considering the uncertainties in the two independent methods employed.

Stability

Measurements have been made of many samples in this batch over time intervals up to 18 months and no evidence has

been found of changes in the concentration of carbon dioxide or in the concentration of nitrous oxide. However, in

several instances, samples from this batch and other batches of carbon dioxide in air have exhibited an increase in

concentration when the cylinder pressure fell to a pressure below 1.04 MPa (ISO psi). It is not recommended that the

sample be used as an analytical standard after the pressure has fallen below 2.76 MPa (400 psi).

The concentrations on the certificate are valid for two years from the date of shipment from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS and, if significant changes are observed, the purchasers of

samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of approximately 0.76 m

3 (27 cubic feet) at STP. The

cylinders conform to DOT specifications and are equipped with CGA-660 valves. The cylinder becomes the property of

the purchaser. However, it may be returned, prepaid, to the National Bureau of Standards for reanalysis.

Reanalysis

When this Standard Reference Material is used as a standard in a long-term program of analysis of atmospheric carbon

dioxide, it may be necessary to confirm the original certification during or at the end of the certification period. The

National Bureau of Standards will reanalyze this Standard Reference Material for the original purchaser at a cost not to exceed the cost of similar materials available at the time of the request for reanalysis. The original purchaser should

contact William Dorko, (301) 921-2888, of the Gas and Particulate Science Division ofthe National Bureau of Standards

to arrange for reanalysis.

20.95 mole percent

ppm by mole*

ppm by mole

ppt** by mole

ppt** by mole

SRM 2610

Page 2 134
^National ^nxtnvc of j^tatutartt*

(Esrttftcate

Standard Reference Material 2612a

Carbon Monoxide in Air

(Nominal Concentration 10 ppm)

(Ambient Air Quality Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon monoxide in air. It is also intended to complement Standard Reference Materials 1677 and 1678

(Carbon Monoxide in Nitrogen) for use with analytical techniques where the use of nitrogen as diluent gas may

result in measurement error. It is not intended as a working standard, but rather as a primary standard to which

the concentration of working standards may be related.

Carbon monoxide concentration: ± ^mole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of carbon monoxide is relative to all other constituents of the gas. The uncertainty shown is the estimated upper limit of error of the carbon monoxide concentration and is the 95 percent confidence

interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified by the cylinder number and sample number on this certificate.

The original development and evaluation of the carbon monoxide in air series of Standard Reference Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and J. E. Suddueth.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Analysis

Carbon monoxide in this Standard Reference Material was determined by comparison with a secondary

standard that had been previously intercompared with a set of primary gravimetric standards. The

intercomparison involved both measurement by a nondispersive infrared technique and by measurement of

methane produced by catalytic reduction of the carbon monoxide.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only I year from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS and if significant changes are observed within the 1 year period,

purchasers of this SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234 George A. Uriano, Chief

January 28, 1980 Office of Standard Reference Materials

(Revision of Certificate

U. S. Department of Commerce

Philip M. Klutznick

Secretary

National Bureau of Standards Emest Ambler, Director

U. S. Department of Commerce

Philip M. Klutznick

National Bureau ofStandards

Ernest Ambler, Director Rational ^Bureau of jgtfatulante

(Eerttfttate

Standard Reference Material 2613a

Carbon Monoxide in Air

(Nominal Concentration 20 ppm)

(Ambient Air Quality Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon monoxide in air. It is also intended to complement Standard Reference Materials 1677 and 1678

(Carbon Monoxide in Nitrogen) for use with analytical techniques where the use of nitrogen as diluent gas may

result in measurement error. It is not intended as a working standard, but rather as a primary standard to which

the concentration of working standards may be related.

Carbon monoxide concentration: ± ^mole/mole (ppm)

Cylinder Number: Sample Number:

The concentration of carbon monoxide is relative to all other constituents of the gas. The uncertainty shown is the estimated upper limit of error of the carbon monoxide concentration and is the 95 percent confidence

interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified by the cylinder number and sample number on this certificate.

The original development and evaluation of the carbon monoxide in air series of Standard Reference Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and J. E. Suddueth.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Analysis

Carbon monoxide in this Standard Reference Material was determined by comparison with a secondary

standard that had been previously intercompared with a set of primary gravimetric standards. The

intercomparison involved both measurement by a nondispersive infrared technique and by measurement of

methane produced by catalytic reduction of the carbon monoxide.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 1 year from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS and if significant changes are observed within the I year period,

purchasers of this SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234 George A. Uriano, Chief

January 28, 1980 Office of Standard Reference Materials

(Revision of Certificate

dated 1-17-77)

U. S. Department of Commerce

Philip M. Klutznick

Secretary

National Bureau of Standards

Ernest Ambler, Director ^National bureau of jliandartte

Certificate

Standard Reference Material 2614a

Carbon Monoxide in Air

(Nominal Concentration 45 ppm)

(Ambient Air Quality Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

carbon monoxide in air. It is also intended to complement Standard Reference Materials 1677 and 1678

(Carbon Monoxide in Nitrogen) for use with analytical techniques where the use of nitrogen as diluent gas may

result in measurement error. It is not intended as a working standard, but rather as a primary standard to which

the concentration of working standards may be related.

Carbon monoxide concentration: ± jumole/ mole (ppm)

Cylinder Number: Sample Number:

The concentration of carbon monoxide is relative to all other constituents of the gas. The uncertainty shown is the estimated upper limit of error of the carbon monoxide concentration and is the 95 percent confidence

interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified by the cylinder number and sample number on this certificate.

The original development and evaluation of the carbon monoxide in air series of Standard Reference Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and J. E. Suddueth.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills. Analysis

Carbon monoxide in this Standard Reference Material was determined by comparison with a secondary

standard that had been previously intercompared with a set of primary gravimetric standards. The

intercomparison involved both measurement by a nondispersive infrared technique and by measurement of

methane produced by catalytic reduction of the carbon monoxide.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 1 year from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS and if significant changes are observed within the 1 year period,

purchasers of this SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 M Pa (1800 psi) with a deliverable volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234 George A. Uriano, Chief

January 28, 1980 Office of Standard Reference Materials

(Revision of Certificate 139

dated 1-17-77)

Rational ^«rea« of jltantlartte

Certificate of (Analysts

Standard Reference Material 2619a

Carbon Dioxide in Nitrogen

(Nominal Concentration 0.5 percent)

(Combustion Efficiency Gas Standard)

This Standard Reference Material is intended primarily for the determination of fuel efficiency of motor

vehicles by a materials balance method and for other gas analysis applications where accurate measurements of

carbon dioxide must be performed. It is not intended as a working standard, but rather as a primary standard to which the concentration of working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the mixture. The uncertainty shown is the estimated upper limit of error of the carbon dioxide concentration and is the 95% confidence interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and E. E. Hughes.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Analysis

The carbon dioxide concentration in this Standard Reference Material (SRM) was determined by comparison

with a secondary standard which had been intercompared with a set of primary gravimetric standards.

The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity

detector. The gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative SRM's from this lot

will be performed, and if any change in concentration is observed the purchasers of other SRM's from this lot

will be notified. The value shown in this certificate is considered valid for a period of one year from receipt.

The SRM should be stored at room temperature and should not be allowed to experience either high or low

ambient temperatures.

Cylinder

This SRM is supplied in a cylinder at a pressure of 12.4 MPa(1800 lb/in

2

) with a deliverable volume of 0.88 m

3

(3 1 cubic ft)) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1 980 1 4

1

Office of Standard Reference Materials

U. S. Department of Commerce

Philip Mi Klutznick peccary?

National Jurww of Standards

Ernest

luraau <

. Ambler, pirector
i
. S. Department of Commerce

Philip M. Uutznick

Secretary

National Buraw of Standard! Eracm Ambler. Director Rational ^mtnxx of ^tandartte

(&ttt\i\tntt xA ^nnhgm

Standard Reference Material 2620a

Carbon Dioxide in Nitrogen

(Nominal Concentration 1.0 percent)

(Combustion Efficiency Gas Standard)

This Standard Reference Material is intended primarily for the determination of fuel efficiency of motor

vehicles by a materials balance method and for other gas analysis applications where accurate measurements of

carbon dioxide must be performed. It is not intended as a working standard, but rather as a primary standard to which the concentration of working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the mixture. The uncertainty shown is the estimated upper limit of error of the carbon dioxide concentration and is the 95% confidence interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials Was performed in the Gas and Particulate Science Division by W. D. Dorko and E. E. Hughes.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Analysis

The carbon dioxide concentration in this Standard Reference Material (SRM) was determined by comparison

with a secondary standard which had been intercompared with a set of primary gravimetric standards.

The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity

detector. The gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative SRM's from this lot will be performed, and if any change in concentration is observed the purchasers of other SRM's from this lot will be notified. The value shown in this certificate is considered valid for a period of one year from receipt.

The SRM should be stored at room temperature and should not be allowed to experience either high or low

ambient temperatures.

Cylinder

This SRM is supplied in a cylinder at a pressure of 12.4 MPa ( 1 800 lb/ in

2

) with a deliverable volume of0.88 m

3

(31 cubic ft) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves. The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

U. S. Department of Commerce

Philip M. KJutznick

"jSecrtlaryi*

, * [

National Bureau of Standards

Ernest Ambler, Director Rational ^Bureau of J§tandante

(ttcrttfttate of ^nal^st*

Standard Reference Material 2621a

Carbon Dioxide in Nitrogen

(Nominal Concentration 1.5 percent)

(Combustion Efficiency Gas Standard)

This Standard Reference Material is intended primarily for the determination of fuel efficiency of motor

vehicles by a materials balance method and for other gas analysis applications where accurate measurements of

carbon dioxide must be performed. It is not intended as a working standard, but rather as a primary standard to which the concentration of working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the mixture. The uncertainty shown is the estimated upper limit of error of the carbon dioxide concentration and is the 95% confidence interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and E. E. Hughes.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills. Analysis

The carbon dioxide concentration in this Standard Reference Material (SRM) was determined by comparison

with a secondary standard which had been intercompared with a set of primary gravimetric standards.

The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity

detector. The gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative SRM's from this lot

will be performed, and if any change in concentration is observed the purchasers of other SRM's from this lot

will be notified. The value shown in this certificate is considered valid for a period of one year from receipt.

The SRM should be stored at room temperature and should not be allowed to experience either high or low

ambient temperatures.

Cylinder

2 3 This SRM is supplied in a cylinder at a pressure of 12.4 MPa (1800 lb/ in ) with a deliverable volume of 0.88 m

(3 1 cubic ft) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234

January 25, 1980

145

George A. Uriano, Chief

Office of Standard Reference Materials
i
U. S. Department of Commerce

Philip M. Klutznick

Secretary [V-.y I National Bursa* ofStandards

Ernest Ambler, Director Rational ^mtnn of Jltanttartta

Certificate of ^nnlyzxz

Standard Reference Material 2622a

Carbon Dioxide in Nitrogen

(Nominal Concentration 2.0 percent)

(Combustion Efficiency Gas Standard)

This Standard Reference Material is intended primarily for the determination of fuel efficiency of motor

vehicles by a materials balance method and for other gas analysis applications where accurate measurements of

carbon dioxide must be performed. It is not intended as a working standard, but rather as a primary standard to which the concentration of working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the mixture. The uncertainty shown is the estimated upper limit of error of the carbon dioxide concentration and is the 95% confidence interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and E. E. Hughes.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E, Gills.

Analysis

The carbon dioxide concentration in this Standard Reference Material (SRM) was determined by comparison

with a secondary standard which had been intercompared with a set of primary gravimetric standards.

The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity

detector. The gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative SRM's from this lot will be performed, and if any change in concentration is observed the purchasers of other SRM's from this lot will be notified. The value shown in this certificate is considered valid for a period of one year from receipt.

The SRM should be stored at room temperature and should not be allowed to experience either high or low

ambient temperatures.

Cylinder

This SRM is supplied in a cylinder at a pressure of 12.4 MPa (1800 lb/ in

2

) with a deliverable volume of 0.88 m

3

(31 cubic ft) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234

January 25, 1980 147

George A. Uriano, Chief

Office of Standard Reference Materials

U. S. Department of Commerce

Philip M, KJutznick

Rational ^ureau of j^tattdartte

Certificate of (Attaint*

Standard Reference Material 2623a

Carbon Dioxide in Nitrogen

(Nominal Concentration 2.5 percent)

(Combustion Efficiency Gas Standard)

This Standard Reference Material is intended primarily for the determination of fuel efficiency of motor

vehicles by a materials balance method and for other gas analysis applications where accurate measurements of

carbon dioxide must be performed. It is not intended as a working standard, but rather as a primary standard to which the concentration of working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the mixture. The uncertainty shown is the estimated upper limit of error of the carbon dioxide concentration and is the 95% confidence interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and E. E. Hughes.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Analysis

The carbon dioxide concentration in this Standard Reference Material (SRM) was determined by comparison

with a secondary standard which had been intercompared with a set of primary gravimetric standards.

The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity

detector. The gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative SRM's from this lot

will be performed, and if any change in concentration is observed the purchasers of other SRM's from this lot

will be notified. The value shown in this certificate is considered valid for a period of one year from receipt.

The SRM should be stored at room temperature and should not be allowed to experience either high or low

ambient temperatures.

Cylinder

This SRM is supplied in a cylinder at a pressure of 12.4 MPa (1800 lb/ in

2

) with a deliverable volume of 0.88 m

3

(31 cubic ft) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234 149 George A. Uriano, Chief

January 25, 1980 Office of Standard Reference Materials

U. S. Department of Commerce

Philip M. Klutznick

^Secrflaryi

National EraexJurat* of Ambler, I

itandards ^National ^ttreau of j^tandartte

Certificate of (Analysis

Standard Reference Material 2624a

Carbon Dioxide in Nitrogen

(Nominal Concentration 3.0 percent)

(Combustion Efficiency Gas Standard)

This Standard Reference Material is intended primarily for the determination of fuel efficiency of motor

vehicles by a materials balance method and for other gas analysis applications where accurate measurements of

carbon dioxide must be performed. It is not intended as a working standard, but rather as a primary standard to which the concentration of working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: . Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the mixture. The uncertainty shown is the estimated upper limit of error of the carbon dioxide concentration and is the 95% confidence interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and E. E. Hughes.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills. Analysis

The carbon dioxide concentration in this Standard Reference Material (SRM) was determined by comparison

with a secondary 'standard which had been intercompared with a set of primary gravimetric standards.

The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity

detector. The gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative SRM's from this lot

will be performed, and if any change in concentration is observed the purchasers of other SRM's from this lot

will be notified. The value shown in this certificate is considered valid for a period of one year from receipt.

The SRM should be stored at room temperature and should not be allowed to experience either high or low

ambient temperatures.

Cylinder

This SRM is supplied in a cylinder at a pressure of 12.4 MPa (1800 lb/ in

2

) with a deliverable volume of 0.88 m

3

(31 cubic ft) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234

January 25, 1980 151

George A. Uriano, Chief

Office of Standard Reference Materials

U. S. Department of Commerce

Philip M. Klutznick ^ecmary

National Buraau of Standards

Ernest Ambler, pirector Rational ^nttnvt of j^tandartte

Certificate of ^nalgsi*

Standard Reference Material 2625a

Carbon Dioxide in Nitrogen

(Nominal Concentration 3.5 percent)

(Combustion Efficiency Gas Standard)

This Standard Reference Material is intended primarily for the determination of fuel efficiency of motor

vehicles by a materials balance method and for other gas analysis applications where accurate measurements of

carbon dioxide must be performed. It is not intended as a working standard, but rather as a primary standard to which the concentration of working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the mixture. The uncertainty shown is the estimated upper limit of error of the carbon dioxide concentration and is the 95% confidence interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and E. E. Hughes.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Analysis

The carbon dioxide concentration in this Standard Reference Material (SRM) was determined by comparison

with a secondary standard which had been intercompared with a set of primary gravimetric standards.

The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity

detector. The gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative SRM's from this lot

will be performed, and if any change in concentration is observed the purchasers of other SRM's from this lot

will be notified. The value shown in this certificate is considered valid for a period of one year from receipt.

The SRM should be stored at room temperature and should not be allowed to experience either high or low

ambient temperatures.

Cylinder

2 3 This SRM is supplied in a cylinder at a pressure of 12.4 MPa (1800 lb/in ) with a deliverable volume of 0.88 m

(31 cubic ft) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234

January 25, 1980 153

George A. Uriano, Chief

Office of Standard Reference Materials

^National ^ureau of j^tattdanfe

Certificate af ^ttalgsi*

Standard Reference Material 2626a

Carbon Dioxide in Nitrogen

(Nominal Concentration 4.0 percent)

(Combustion Efficiency Gas Standard)

This Standard Reference Material is intended primarily for the determination of fuel efficiency of motor

vehicles by a materials balance method and for other gas analysis applications where accurate measurements of

carbon dioxide must be performed. It is not intended as a working standard, but rather as a primary standard to which the concentration of working standards may be related.

Carbon dioxide concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of carbon dioxide is relative to all other constituents of the mixture. The uncertainty shown is the estimated upper limit of error of the carbon dioxide concentration and is the 95% confidence interval based on allowances for known sources of possible error.

Each cylinder is individually analyzed and the concentration that appears above applies to the cylinder

identified on this certificate.

The original development and evaluation of the carbon dioxide in nitrogen series of Standard Reference

Materials was performed in the Gas and Particulate Science Division by W. D. Dorko and E. E. Hughes.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook, Chief of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Analysis

The carbon dioxide concentration in this Standard Reference Material (SRM) was determined by comparison

with a secondary standard which had been intercompared with a set of primary gravimetric standards.

The intercomparisons were performed using a gas chromatograph equipped with a thermal conductivity

detector. The gravimetric standards were prepared from analyzed samples of nitrogen and carbon dioxide.

Stability

The stability of these mixtures is considered to be excellent. No loss of carbon dioxide has been observed in either the standards or in previous lots of this SRM. Periodic reanalyses of representative SRM's from this lot will be performed, and if any change in concentration is observed the purchasers of other SRM's from this lot will be notified. The value shown in this certificate is considered valid for a period of one year from receipt.

The SRM should be stored at room temperature and should not be allowed to experience either high or low

ambient temperatures.

Cylinder

This SRM is supplied in a cylinder at a pressure of 12.4 MPa (1800 lb/ in ) with a deliverable volume of 0.88 m

(31 cubic ft) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinder becomes the property of the purchaser. However, it may be returned, prepaid, to the National

Bureau of Standards for disposal.

Washington, D.C. 20234 George A. Uriano, Chief

January 25, 1980 155 Office of Standard Reference Materials

U. S. Department of Commerce

Philip M. Klutznick

U. S. Department of Commerce

Malcolm -fiaidnpe 'Secretary f

National luraapioi~Standards

Ernest Ambler. Director

Rational ^uram of j8»tattdartte

Certificate af ^mlyzxz

Standard Reference Material 2627

Nitric Oxide in Nitrogen

(Nominal Concentration 5 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of oxides of

nitrogen in mobile-source emissions. It is not intended as a working standard, but rather as a primary laboratory

standard to which the concentration of nitric oxide in other standards may be related.

The concentration of nitric oxide is relative to all other constituents of the gas. The uncertainty shown is the estimated

upper limit of error of the nitric oxide concentration and is the 95 percent confidence interval based on allowances for

known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified

by cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas handling system.

The research and development leading to the certification of this SRM were supported in part by the Motor Vehicle

Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the nitric oxide in nitrogen series of Standard Reference Materials were performed in the Gas and Particulate Science Division by W. P. Thorn, W. R. Miller, and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

June 7, 1982 Office of Standard Reference Materials

Nitric oxide concentration: + /imole/mole(ppm)

Cylinder Number: Sample Number:

(over)

157
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for nitric oxide content.

Analysis

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary standards

that had been previously intercompared with a set of primary gravimetric standards. The method of intercomparison

utilized the chemiluminescent reaction of nitric oxide with ozone.

Representative samples have been analyzed for the presence of other nitrogen oxides by passing the sample through a high-temperature catalytic furnace which converts these other oxides of nitrogen to nitric oxide. Under the conditions of

the analysis a minimum of one percent of other nitrogen oxides would have been detected. No other oxides of nitrogen were detected in the samples analyzed within the stated limits.

Stability

Loss of nitric oxide by adsorption on the container walls may occur in new cylinders not previously used for nitric oxide

mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders. The use of this preconditioning procedure may result in desorption of nitric oxide from the cylinder walls when the cylinder pressure is reduced. It is not recommended that the sample be used for accurate analyses at cylinder pressures below 2.8 MPa

(400 psi).

The concentration on this certificate is valid for one year from the date of purchase from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within one year,

the purchasers of samples Irom the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser.

SRM 2627

Page 2

158
U. S. Department of Commerce

Malcojnj Baldrige

^Secretary?'

National luraaH ofstandards

Ernest Umbllrr. urecior

Rational J£uram of j^tandard*

Certificate of ^nnlysxz

Standard Reference Material 2628

Nitric Oxide in Nitrogen

(Nominal Concentration 10 ppm)

(Mobile -Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of oxides of

nitrogen in mobile-source emissions. It is not intended as a working standard, but rather as a primary laboratory

standard to which the concentration of nitric oxide in other standards may be related.

The concentration of nitric oxide is relative to all other constituents of the gas. The uncertainty shown is the estimated

upper limit of error of the nitric oxide concentration and is the 95 percent confidence interval based on allowances for

known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified

by cylinder number and sample number on this certificate.

CAUTION: Care must be takeji to avoid accidental contamination of the sample during the use of the cylinder with any

gas handling system.

The research and development leading to the certification of this SRM were supported in part by the Motor Vehicle

Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the nitric oxide in nitrogen series of Standard Reference Materials were performed in

the Gas and Particulate Science Division by W. P. Thorn, W. R. Miller, and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

June 7, 1982 Office of Standard Reference Materials

Nitric oxide concentration: + jumole/mole(ppm)

Cylinder Number: Sample Number:

(over)

159
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for nitric oxide content.

Analysis

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary standards

that had been previously intercompared with a set of primary gravimetric standards. The method of intercomparison

utilized the chemiluminescent reaction of nitric oxide with ozone.

Representative samples have been analyzed for the presence of other nitrogen oxides by passing the sample through a high-temperature catalytic furnace which converts these other oxides of nitrogen to nitric oxide. Under the conditions of

the analysis a minimum of one percent of other nitrogen oxides would have been detected. No other oxides of nitrogen were detected in the samples analyzed within the stated limits.

Stability

Loss of nitric oxide by adsorption on the container walls may occur in new cylinders not previously used for nitric oxide

mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders. The use of this preconditioning procedure may result in desorption of nitric oxide from the cylinder walls when the cylinder pressure is reduced. It is not recommended that the sample be used for accurate analyses at cylinder pressures below 2.8 MP;

(400 psi).

The concentration on this certificate is valid for one year from the date of purchase from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within one year,

the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-660 valves.

I he cylinder becomes the property of the purchaser.

SRM 2628

Page 2

160
U. S. Department of Commerce

Malcolnr Baldrige

'Secretary?

Rational J&nttmx of j&tantlartte

(fLtttxtitntt of ^ttaltjst*

Standard Reference Material 2629

Nitric Oxide in Nitrogen

(Nominal Concentration 20 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of oxides of

nitrogen in mobile-source emissions. It is not intended as a working standard, but rather as a primary laboratory

standard to which the concentration of nitric oxide in other standards may be related.

The concentration of nitric oxide is relative to all other constituents of the gas. The uncertainty shown is the estimated

upper limit of error of the nitric oxide concentration and is the 95 percent confidence interval based on allowances for

known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified

by cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas handling system.

The research and development leading to the certification of this SRM were supported in part by the Motor Vehicle

Manufacturers Association ol the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the nitric oxide in nitrogen series of Standard Reference Materials were performed in the Gas and Particulate Science Division by W. P. Thorn, W. R. Miller, and W. D. Dorko.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

June 7, 1982 Office of Standard Reference Materials

Nitric oxide concentration: + /xmole / mole(ppm)

Cylinder Number: Sample Number:

(over)

161
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications to ensure that the lot is homogeneous and stable. Each

cylinder in the lot is individually analyzed at NBS for nitric oxide content.

Analysis

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary standards

that had been previously intercompared with a set of primary gravimetric standards. The method of intercomparison

utilized the chemiluminescent reaction of nitric oxide with ozone.

Representative samples have been analyzed for the presence of other nitrogen oxides by passing the sample through a high-temperature catalytic furnace which converts these other oxides of nitrogen to nitric oxide. Under the conditions of

the analysis a minimum of one percent of other nitrogen oxides would have been detected. No other oxides of nitrogen were detected in the samples analyzed within the stated limits.

Stability

Loss of nitric oxide by adsorption on the container walls may occur in new cylinders not previously used for nitric oxide

mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders. The use of this preconditioning procedure may result in desorption of nitric oxide from the cylinder walls when the cylinder pressure is reduced. It is not recommended that the sample be used for accurate analyses at cylinder pressures below 2.8 MPa

(400 psi).

The concentration on this certificate is valid for one year from the date of purchase from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within one year,

the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser.

SRM 2629

Page 2

162
U.S. Department of Commerce

Juanita M~ Kreps

Sectary?

National Bureau; of Standards

Ernest l^mblier. Director

Rational JSuram of ^tand&tdz

Olerttftcat^

Standard Reference Material 2630

Nitric Oxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a mixture of nitric oxide in high purity nitrogen which is supplied in a highpressure, compressed gas cylinder. The statistical uncertainty in each step of the preparation and analysis of this

mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material should be

used sparingly as a valuable primary standard to which daily working standards may be related.

CAUTION: Every precaution must be taken to avoid accidental contamination of the sample with atmospheric

air during connection of the cylinder to any gas-handling system.

The concentration of nitric oxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ± 0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy. The estimated

upper limit of error of the nitric oxide concentration is ± 1.0% relative. This estimate is the 95% confidence

interval based on allowances for known sources of possible error.

The research and development of this Standard Reference Material was supported by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E.E. Hughes and H.L. Rook.

The technical and support aspects involved in the preparation, certification and issuance of this Standard Refer- ence Material were coordinated through the Office of Standard Reference Materials by W.P. Reed.

Nitric Oxide Concentration: Atmol/mol (ppm)

Cylinder Number: Sample Number:

W. J. Thorn.

Washington, D.C. 20234

May 2, 1979

George A. Uriano, Chief

Office of Standard Reference Materials

(over)

163
Analysis:

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of

intercomparison utilized the chemiluminescent reaction of nitric oxide with ozone.

The upper limit of the total uncertainty including both the imprecision of intercomparison and the inaccuracy

of the gravimetric standards is less than 1.0% relative at the 95% confidence level.

At least 8% of the samples from the lot have been analyzed for nitrogen dioxide by a wet chemical method (a

modified Saltzman technique). The maximum concentration of nitrogen dioxide did not exceed 0.5% relative to

the nitric oxide in the samples analyzed.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of nitric

oxide have been observed for similar samples contained in aluminum cylinders for periods of time greater than 2

years. The value appearing on this certificate is considered valid for 2 years from date of purchase. Periodic

reanalyses of representative samples from this lot will be performed, and if significant changes are observed

within a one year period the purchasers of other samples from the lot will be notified. Validation of the

concentration of nitric oxide in cylinders that have been in the possession of the purchasers for more than one

year can be made by the National Bureau of Standards at a nominal charge if more than 1000 psi remains in the

cylinder.

Cylinder:

These gases are supplied in cylinders with a delivered volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders

conform to the DOT specification and are equipped with CGA 660 valves.

NOTE:

This cylinder is the property of the purchaser. If the user is unable to dispose of the cylinder it may be returned,

prepaid, to the National Bureau of Standards for disposal.

164
U.S. Department of Commerce

Juanita >$„ Kreps

1 fcenetary,

Rational ^Bureau of jUiantlartte

Certificate

Standard Reference Material 2631

Nitric Oxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a mixture of nitric oxide in high purity nitrogen which is supplied in a

high-pressure, compressed gas cylinder. The statistical uncertainty in each step of the preparation and analysis

of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material

should be used sparingly as a valuable primary standard to which daily working standards may be related.

CAUTION: Every precaution must be taken to avoid accidental contamination ofthe sample with atmospheric

air during connection of the cylinder to any gas-handling system.

The concentration of nitric oxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ± 0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy. The estimated

upper limit of error of the nitric oxide concentration is ± 1.0% relative. This estimate is the 95% confidence

interval based on allowances for known sources of possible error. The research and development of this Standard Reference Material was supported by the Motor Vehicle

Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W.R. Miller and

W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E.E. Hughes and H.L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by W.P. Reed.

Washington, D.C. 20234 George A. Uriano, Chief

May 2, 1 979 Office of Standard Reference Materials

Nitric Oxide Concentration: ± /umol/mol (ppm)

Cylinder Number: Sample Number

(over)

165
Analysis:

The nitric oxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously intercompared with a set of primary gravimetric standards. The method of

intercomparison utilized the chemiluminescent reaction of nitric oxide with ozone.

The upper limit of the total uncertainty including both the imprecision of intercomparison and the inaccuracy of

the gravimetric standards is less than 1.0% relative at the 95% confidence level.

At least 8% of the samples from the lot have been analyzed for nitrogen dioxide by a wet chemical method (a

modified Saltzman technique). The maximum concentration of nitrogen dioxide did not exceed 0.5% relative to

the nitric oxide in the samples analyzed.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of nitric

oxide have been observed for similar samples contained in aluminum cylinders for periods of time greater than 2

years. The value appearing on this certificate is considered valid for 2 years from date of purchase. Periodic

reanalysesof representative samples from this lot will be performed, and if significant changes are observed

within a one year period the purchasers of other samples from the lot will be notified. Validation of the

concentration of nitric oxide in cylinders that have been in the possession of the purchasers for more than one

year can be made by the National Bureau of Standards at a nominal charge if more than 1000 psi remains in the

cylinder.

Cylinder:

These gases are suppli n cylinders with a delivered volume of 0.85 m (30 cubic feet) at STP. The cylinders

conform to the DOT specification and are equipped with CGA 660 valves.

NOTE:

This cylinder is the property of the purchaser. If the user is unable to dispose of the cylinder it may be returned,

prepaid, to the National Bureau of Standards for disposal.

166
U.S. Department of Commerce

Juanita M. Kreps

Secretary

National Bureau of Standards

Ernest ^mblfcr, Pirector

Rational ^Buram of jltatutortte

(fterttftcate

Standard Reference Material 2632

Carbon Dioxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon dioxide in high purity nitrogen, and is supplied in

high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and analysis

of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material

should be used sparingly as a valuable primary standard to which daily working standards may be related.

Carbon dioxide concentration: ± jumol/mol (ppm)

Cylinder number: Sample number:

The concentration of carbon dioxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ± 0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller

and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by W. P. Reed.

Washington, D.C. 20234 George A. Uriano, Chief

April 1, 1979 Office of Standard Reference Materials

(over)

167
Analysis:

Carbon dioxide in this Standard Reference Material was determined by comparison with a batch standard that

had been previously intercompared with a set of primary gravimetric standards. The intercomparison involved

both measurements by a nondispersive infrared technique and by gas chromatography utilizing an ultrasonic

detector. The imprecision of intercomparison is less than 0.2 percent relative and the inaccuracy of the primary

gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the

imprecision of intercomparison and the inaccuracy of the gravimetric standards is less than 1% relative at the

95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of

carbon dioxide have been observed for similar samples contained in aluminum cylinders for periods of time

greater than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from

date of purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Validation of the concentration of carbon dioxide in cylinders which have been in the possession of the

purchasers for more than 2 years can be made by the National Bureau of Standards at a nominal charge if more

than 6.4 MPa (1000 psi) remains in the cylinder. Inquiries concerning recertification should be made to Chief,

Gas and Particulate Science Division, NBS, at (301) 921-2886.

Cylinder:

These gases are supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-580 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2632

168
U.S. Department of Commerce

Juanita Krepe

Rational ^Bureau of j^tamtard*

Certificate

Standard Reference Material 2633

Carbon Dioxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon dioxide in high purity nitrogen, and is supplied in

high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and analysis

of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material

should be used sparingly as a valuable primary standard to which daily working standards may be related.

The concentration of carbon dioxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller

and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by W. P. Reed.

Washington, D.C. 20234 George A. Uriano, Chief

April 1, 1979 Office of Standard Reference Materials

Carbon dioxide concentration: /xmol/mol (ppm)

Cylinder number: Sample number:

(over)

169
Analysis:

Carbon dioxide in this Standard Reference Material was determined by comparison with a batch standard that

had been previously intercompared with a set of primary gravimetric standards. The intercomparison involved

both measurements by a nondispersive infrared technique and by gas chromatography utilizing an ultrasonic

detector. The imprecision of intercomparison is less than 0.2 percent relative and the inaccuracy of the primary

gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the

imprecision of intercomparison and the inaccuracy of the gravimetric standards is less than 1% relative at the

95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of

carbon dioxide have been observed for similar samples contained in aluminum cylinders for periods of time

greater than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from

date of purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Validation of the concentration of carbon dioxide in cylinders which have been in the possession of the

purchasers for more than 2 years can be made by the National Bureau of Standards at a nominal charge if more

than 6.4 MPa (1000 psi) remains in the cylinder. Inquiries concerning recertification should be made to Chief,

Gas and Particulate Science Division, NBS, at (301) 921-2886.

Cylinder:

These gases are supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-580 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2633

170
U.S. Departrrtent of Commerce

Juanita M* Kreps

National I iuMMF©Tstandards

Ernest tynbl^r, pirector

Rational JBttrtsn of ^twxdntdz

(fltttlixtntt

Standard Reference Material 2634

Carbon Dioxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon dioxide in high purity nitrogen, and is supplied in

high-pressure, compressed gas cylinders. The statistical uncertainty in each step ofthe preparation and analysis

of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material

should be used sparingly as a valuable primary standard to which daily working standards may be related.

Carbon dioxide concentration: ± /umol/mol (ppm)

Cylinder number: Sample number:

The concentration of carbon dioxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller

and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by W. P. Reed.

Washington, D.C. 20234 George A. Uriano, Chief

April 1, 1979 Office of Standard Reference Materials

(over)

171
Analysis:

Carbon dioxide in this Standard Reference Material was determined by comparison with a batch standard that

had been previously intercompared with a set of primary gravimetric standards. The intercomparison involved

both measurements by a nondispersive infrared technique and by gas chromatography utilizing an ultrasonic

detector. The imprecision of intercomparison is less than 0.2 percent relative and the inaccuracy of the primary

gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the

imprecision of intercomparison and the inaccuracy of the gravimetric standards is less than 1% relative at the

95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of

carbon dioxide have been observed for similar samples contained in aluminum cylinders for periods of time

greater than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from

date of purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Validation of the concentration of carbon dioxide in cylinders which have been in the possession of the

purchasers for more than 2 years can be made by the National Bureau of Standards at a nominal charge if more

than 6.4 MPa (1000 psi) remains in the cylinder. Inquiries concerning recertification should be made to Chief,

Gas and Particulate Science Division, NBS, at (301) 921-2886.

Cylinder:

These gases are supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m (31

cubic feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-580 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2634

172
U.S. Department of Commerce

Juanita )4„ Kreps

«eciset8Cfy?'

National 1 iuMM o/Standards

Ernest Itanblpr, director

Rational J&vcttnvt of jltandartte

Certificate

Standard Reference Material 2635

Carbon Monoxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon monoxide in high purity nitrogen and is supplied in

high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and analysis

of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material

should be used sparingly as a valuable primary standard to which daily working standards may be related.

The concentration of carbon monoxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and

W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. GilLs.

Washington, D.C. 20234 George A. Uriano, Chief

October 2, 1979 Office of Standard Reference Materials

Carbon monoxide concentration: /umol/mol (ppm)

Cylinder number: Sample number:

(over)

173
Analysis:

Carbon monoxide in this Standard Reference Material was determined by comparison with a batch standard

that had been previously intercompared with a set of primary gravimetric standards. The intercomparison

involved measurements by a nondispersive infrared technique and /or by gas chromatography. The imprecision

of intercomparison is less than 0.2 percent relative and the inaccuracy of the primary gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the imprecision of intercomparison

and the inaccuracy of the gravimetric standards is less than 1% relative at the 95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of carbon

monoxide have been observed for similar samples contained in aluminum cylinders for periods of time greater

than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from date of

purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Cylinder:

These gases are supplied in cylinders at 1 2.4 MPa ( 1 800 psi) pressure with a delivered volume of 0.88 m

3 (3 1 cubic

feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-350 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2635

174
U.S. Depart. rrtent of Commerce

Juanita J4» Kreps

National Biiriiirof Standards

Ernest Amb|r, Director

Rational ^Bureau of j^tandartte

Certificate

Standard Reference Material 2636

Carbon Monoxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon monoxide in high purity nitrogen and is supplied in

high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and analysis

of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material

should be used sparingly as a valuable primary standard to which daily working standards may be related.

The concentration of carbon monoxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Carbon monoxide concentration: /Limol/mol (ppm)

Cylinder number: Sample number:

W. J. Thorn.

Washington, D.C. 20234

October 2, 1979

George A. Uriano, Chief

Office of Standard Reference Materials

(over)

175
Analysis:

Carbon monoxide in this Standard Reference Material was determined by comparison with a batch standard

that had been previously intercompared with a set of primary gravimetric standards. The intercomparison

involved measurements by a nondispersive infrared technique and /or by gas chromatography. The imprecision

of intercomparison is less than 0.2 percent relative and the inaccuracy ofthe primary gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the imprecision of intercomparison

and the inaccuracy of the gravimetric standards is less than 1% relative at the 95% confidence level.

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of carbon

monoxide have been observed for similar samples contained in aluminum cylinders for periods of time greater

than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from date of

purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

These gases are supplied in cylinders at 1 2.4 MPa ( 1 800 psi) pressure with a delivered volume of 0. 88 m (31 cubic

feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-350 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

Stability:

Cylinder:

SRM 2636

176
U.S. Department of Commerce

Juanita M> Kreps

Secretary

National Bureau of Standards

Ernest Ambler, Pirector

Rational ^mtnn of j&tatttlard*

Certificate

Standard Reference Material 2637

Carbon Monoxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon monoxide in high purity nitrogen and is supplied in

high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and analysis

of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material

should be used sparingly as a valuable primary standard to which daily working standards may be related.

Carbon monoxide concentration:

Cylinder number:

/umol/mol (ppm)

Sample number:

The concentration of carbon monoxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and

W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234

October 2, 1979

George A. Uriano, Chief

Office of Standard Reference Materials

(over)

177
Analysis:

Carbon monoxide in this Standard Reference Material was determined by comparison with a batch standard

that had been previously intercompared with a set of primary gravimetric standards. The intercomparison

involved measurements by a nondispersive infrared technique and /or by gas chromatography. The imprecision

of intercomparison is less than 0.2 percent relative and the inaccuracy of the primary gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the imprecision of intercomparison

and the inaccuracy of the gravimetric standards is less than 1% relative at the 95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of carbon

monoxide have been observed for similar samples contained in aluminum cylinders for periods of time greater

than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from date of

purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Cylinder:

These gases are supplied in cylinders at 1 2. 4 MPa ( 1 800 psi) pressure with a delivered volume of 0. 88 m

3 (3 1 cubic

feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-350 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2637

178
U.S. Department of Commerce

Juanita M~ Kreps

Secretary?

! y

National Bureau of Standards

Ernest ^mbler, pirector

Rational bureau of j^tanttartte

(Eerttftcate

Standard Reference Material 2638

Carbon Monoxide in Nitrogen

(Mobile- Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon monoxide in high purity nitrogen and is supplied in

high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and analysis

of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference Material

should be used sparingly as a valuable primary standard to which daily working standards may be related.

Carbon monoxide concentration: ± /xmol/mol (ppm)

Cylinder number: Sample number:

The concentration of carbon monoxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and

W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

October 2, 1979 Office of Standard Reference Materials

(over)

179
Analysis:

Carbon monoxide in this Standard Reference Material was determined by comparison with a batch standard

that had been previously intercompared with a set of primary gravimetric standards. The intercomparison

involved measurements by a nondispersive infrared technique and /or by gas chromatography. The imprecision

of intercomparison is less than 0.2 percent relative and the inaccuracy ofthe primary gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the imprecision of intercomparison

and the inaccuracy of the gravimetric standards is less than 1% relative at the 95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of carbon

monoxide have been observed for similar samples contained in aluminum cylinders for periods of time greater

than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from date of

purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Cylinder:

These gases are supplied in cylinders at 1 2.4 MPa ( 1 800 psi) pressure with a delivered volume of 0. 88 m

3 (3 1 cubic

feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-350 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2638

180
U.S. Department of Commerce

Juanita M*. Kreps

Secretary

:..:.>

; lr.J

National Bureau of Standards

Ernest Ambler, pirector

Rational ^mtnn of jitandartte

Certificate

Standard Reference Material 2639

Carbon Monoxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon monoxide in high purity nitrogen, and is supplied

in high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and

analysis of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference

Material should be used sparingly as a valuable primary standard to which daily working standards may be

related.

Carbon Monoxide concentration: ± Mole Percent

Cylinder number: Sample Number:

The concentration of carbon monoxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller

and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by W. P. Reed.

Washington, D.C. 20234

July 30, 1979

George A. Uriano, Chief

Office of Standard Reference Materials

(over)

181
Analysis:

Carbon monoxide in this Standard Reference Material was determined by comparison with a batch standard

that had been previously intercompared with a set of primary gravimetric standards. The intercomparison

involved measurements by a nondispersive infrared technique and/or by gas chromatography. The imprecision

of intercomparison is less than 0.2 percent relative and the inaccuracy of the primary gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the imprecision of intercomparison

and the inaccuracy of the gravimetric standards is less than 1% relative at the 95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of carbon

monoxide have been observed for similar samples contained in aluminum cylinders for periods of time greater

than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from date of

purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Validation of the concentration of carbon monoxide in cylinders which have been in the possession of the

purchasers for more than 2 years can be made by the National Bureau of Standards at a nominal charge if more

than 6.4 MPa (1000 psi) remains in the cylinder. Inquiries concerning recertification should be made to Chief,

Gas and Particulate Science Division, NBS, at (301) 921-2886.

Cylinder:

These gases are supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-580 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2639

182
U.S. Department of Commerce

Juanita )4. Kreps

ftewtarw

National Bunww of Standards

Ernest wnblpr, director

Rational ££uram of jUtantlartte

(Certificate

Standard Reference Material 2640

Carbon Monoxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon monoxide in high purity nitrogen, and is supplied

in high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and

analysis of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference

Material should be used sparingly as a valuable primary standard to which daily working standards may be

related.

The concentration of carbon monoxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller

and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by W. P. Reed.

Washington, D.C. 20234 George A. Uriano, Chief

July 30, 1979 Office of Standard Reference Materials

Carbon Monoxide concentration: Mole Percent

Cylinder number: Sample Number:

(over)

183
Analysis:

Carbon monoxide in this Standard Reference Material was determined by comparison with a batch standard

that had been previously intercompared with a set of primary gravimetric standards. The intercomparison

involved measurements by a nondispersive infrared technique and /or by gas chromatography. The imprecision

of intercomparison is less than 0.2 percent relative and the inaccuracy of the primary gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the imprecision of intercomparison

and the inaccuracy of the gravimetric standards is less than 1% relative at the 95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of carbon

monoxide have been observed for similar samples contained in aluminum cylinders for periods of time greater

than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from date of

purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Validation of the concentration of carbon monoxide in cylinders which have been in the possession of the

purchasers for more than 2 years can be made by the National Bureau of Standards at a nominal charge if more

than 6.4 MPa (1000 psi) remains in the cylinder. Inquiries concerning recertification should be made to Chief,

Gas and Particulate Science Division, NBS, at (301) 921-2886.

Cylinder:

These gases are supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-580 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2640

184
U.S. Department of Commerce

Juanita Kreps

National Buraair of Standards

Ernest Ambler, pirector

Rational JBurcaw of j^tattdartte

Certificate

Standard Reference Material 2641

Carbon Monoxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon monoxide in high purity nitrogen, and is supplied

in high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and

analysis of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference

Material should be used sparingly as a valuable primary standard to which daily working standards may be

related.

Carbon Monoxide concentration: ± Mole Percent

Cylinder number: Sample Number:

The concentration of carbon monoxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller

and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by W. P. Reed.

Washington, D.C. 20234 George A. Uriano, Chief

July 30, 1979 Office of Standard Reference Materials

(over)

185
Analysis:

Carbon monoxide in this Standard Reference Material was determined by comparison with a batch standard

that had been previously intercompared with a set of primary gravimetric standards. The intercomparison

involved measurements by a nondispersive infrared technique and/or by gas chromatography. The imprecision

of intercomparison is less than 0.2 percent relative and the inaccuracy ofthe primary gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the imprecision of intercomparison

and the inaccuracy of the gravimetric standards is less than 1% relative at the 95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of carbon

monoxide have been observed for similar samples contained in aluminum cylinders for periods of time greater

than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from date of

purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Validation of the concentration of carbon monoxide in cylinders which have been in the possession of the

purchasers for more than 2 years can be made by the National Bureau of Standards at a nominal charge if more

than 6.4 MPa (1000 psi) remains in the cylinder. Inquiries concerning recertification should be made to Chief,

Gas and Particulate Science Division, NBS, at (301) 921-2886.

Cylinder:

These gases are supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-580 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2641

186
U.S. Department of Commerce

•Juanita Mv Keeps

SecretaryRational ^Bureau of j^tandartb

Certificate

Standard Reference Material 2642

Carbon Monoxide in Nitrogen

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is a gas mixture of carbon monoxide in high purity nitrogen, and is supplied

in high-pressure, compressed gas cylinders. The statistical uncertainty in each step of the preparation and

analysis of this mixture has been carefully evaluated at the 95% confidence level. This Standard Reference

Material should be used sparingly as a valuable primary standard to which daily working standards may be

related.

The concentration of carbon monoxide is relative to all other constituents of the gas.

Each cylinder of gas is individually analyzed, but the concentration appearing on this certificate applies to all samples within the lot. The concentration of all samples in the lot fell within a limit of ±0.3 percent of the

average for the lot and all samples are considered identical within the stated limits of accuracy.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller

and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by W. P. Reed.

Washington, D.C. 20234 George A. Uriano, Chief

July 30, 1979 Office of Standard Reference Materials

Carbon Monoxide concentration: Mole Percent

Cylinder number: Sample Number:

(over)

187
Analysis:

Carbon monoxide in this Standard Reference Material was determined by comparison with a batch standard

that had been previously intercompared with a set of primary gravimetric standards. The intercomparison

involved measurements by a nondispersive infrared technique and /or by gas chromatography. The imprecision

of intercomparison is less than 0.2 percent relative and the inaccuracy ofthe primary gravimetric standard is less than 0.4% relative. The upper limit of the total uncertainty including both the imprecision of intercomparison

and the inaccuracy of the gravimetric standards is less than 1% relative at the 95% confidence level.

Stability:

These samples are contained in aluminum cylinders. The stability is considered excellent and no losses of carbon

monoxide have been observed for similar samples contained in aluminum cylinders for periods of time greater

than 3 years. However, the value appearing on this certificate is considered valid for only 2 years from date of

purchase. Periodic reanalyses of representative samples from this lot will be performed, and if significant

changes are observed within the 2 year period the purchasers of other samples from the lot will be notified.

Validation of the concentration of carbon monoxide in cylinders which have been in the possession of the

purchasers for more than 2 years can be made by the National Bureau of Standards at a nominal charge if more

than 6.4 MPa (1000 psi) remains in the cylinder. Inquiries concerning recertification should be made to Chief,

Gas and Particulate Science Division, NBS, at (301) 921-2886.

Cylinder:

These gases are supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to a DOT specification and are equipped with CGA-580 valves.

These cylinders are the property of the purchaser. However, if desired they may be returned, prepaid, to the

National Bureau of Standards for disposal.

SRM 2642

188
U. S. Department of Commerce

Philip M> Kluttnick

Secretary

Rational ^nttm of jltattdartb

Certificate of (Analysis

Standard Reference Material 2643

Propane in Nitrogen

(Nominal Concentration 100 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary standard to which

the concentration of the daily working standards may be related.

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the propane concentration at the 95 percent confidence level. This uncertainty includes the inaccuracy of

the gravimetric primary standards and the imprecision of intercomparison with the gravimetric standards. This sample is certified only for the concentration of propane. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as propane, is

The content of each cylinder is individually analyzed and the concentration appearing above is the measured value for

the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported by the

Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

May 30, 1980 Office of Standard Reference Materials

Propane concentration:

Cylinder Number:

+ /xmole/ mole (ppm)

Sample Number:

/xmole/ mole (ppm).

(over)

189
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration has been

observed in similar samples contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative samples from this lot will be

performed at NBS, and if significant changes are observed within the 2 year period, purchasers of the SRM will be

notified.

Cylinder

This S RM is supplied in cylinders at a pressure of 1 2.4 MPa ( 1 800 psi) with a deliverable volume of0.88 m

3 (3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 2643

190
S. Department of Commerce

Philip M. Klutznick

Secretary

National Bureau of Standards

Ernest Ambler. Director

Rational J&uram of jltandartte

Certificate of ^nalgsis

Standard Reference Material 2644

Propane in Nitrogen

(Nominal Concentration 250 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary standard to which

the concentration of the daily working standards may be related.

Propane concentration:

Cylinder Number:

/umole/ mole (ppm)

Sample Number:

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the propane concentration at the 95 percent confidence level. This uncertainty includes the inaccuracy of

the gravimetric primary standards and the imprecision of intercomparison with the gravimetric standards. This sample is

certified only for the concentration of propane. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as propane, is /xmole/mole (ppm).

The content of each cylinder is individually analyzed and the concentration appearing above is the measured value for

the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported by the

Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234

May 30, 1980

George A. Uriano, Chief

Office of Standard Reference Materials

(over)

191
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration has been

observed in similar samples contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative samples from this lot will be

performed at NBS, and if significant changes are observed within the 2 year period, purchasers of the SRM will be

notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of0.88 m

3 (3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 2644

192
S. Department of Commerce

Philip M. Klutznick

Secretary

National Buna* of Standard*

Ernest Ambler, Director

Rational ^mtnn of j^tandartte

(fltttxixt&tt of JVnaliJste

Standard Reference Material 2645

Propane in Nitrogen

(Nominal Concentration 500 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary standard to which

the concentration of the daily working standards may be related.

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the propane concentration at the 95 percent confidence level. This uncertainty includes the inaccuracy of

the gravimetric primary standards and the imprecision of intercomparison with the gravimetric standards. This sample is

certified only for the concentration of propane. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as propane, is

The content of each cylinder is individually analyzed and the concentration appearing above is the measured value for

the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported by the

Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

May 30, 1980 Office of Standard Reference Materials

Propane concentration:

Cylinder Number:

jzmole/ mole (ppm)

Sample Number:

/umole/mole (ppm).

(over)

193
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration has been

observed in similar samples contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative samples from this lot will be

performed at NBS, and if significant changes are observed within the 2 year period, purchasers of the SRM will be

notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 2645

194
S. Department of Commerce

Philip M. KJutznick

Secretary

National Bureau of Standards

Ernest Ambler, Director

Rational ^mtnn of j^iantlartte

Certificate of JVnaltjfci*

Standard Reference Material 2646

Propane in Nitrogen

(Nominal Concentration 1000 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary standard to which

the concentration of the daily working standards may be related.

Propane concentration: ± »umole/ mole (ppm)

Cylinder Number: Sample Number:

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the propane concentration at the 95 percent confidence level. This uncertainty includes the inaccuracy of

the gravimetric primary standards and the imprecision of intercomparison with the gravimetric standards. This sample is

certified only for the concentration of propane. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as propane, is /imole/mole (ppm).

The content of each cylinder is individually analyzed and the concentration appearing above is the measured value for

the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported by the

Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

May 30, 1980 Office of Standard Reference Materials

(over)

195
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration has been

observed in similar samples contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative samples from this lot will be

performed at NBS, and if significant changes are observed within the 2 year period, purchasers of the SRM will be

notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 1 2.4 MPa ( 1 800 psi) with a deliverable volume of0.88 m

3 (3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 2646

196
S. Department of Commerce

Philip M. Klutznick

Secretary

L *

National Burwa of Standard!

Ernest Ambler, Director

Rational ££uram of jitandartte

Certificate of ^nal^fe

Standard Reference Material 2647

Propane in Nitrogen

(Nominal Concentration 2500 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary standard to which

the concentration of the daily working standards may be related.

Propane concentration: ± /umole/ mole (ppm)

Cylinder Number: Sample Number:

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the propane concentration at the 95 percent confidence level. This uncertainty includes the inaccuracy of

the gravimetric primary standards and the imprecision of intercomparison with the gravimetric standards. This sample is

certified only for the concentration of propane. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as propane, is

ft mole/mole (ppm).

The content of each cylinder is individually analyzed and the concentration appearing above is the measured value for

the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported by the

Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

May 30, 1980 Office of Standard Reference Materials

(over)

197
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration has been

observed in similar samples contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative samples from this lot will be

performed at NBS, and if significant changes are observed within the 2 year period, purchasers of the SRM will be

notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 2647

198
. S. Department of Commerce

Philip M. Hutznick

Secretary

National Burma of Standards

Ernest Ambler, Director

Rational f&vtttnn of j^tandard*

Certificate of JVnaljjsi*

Standard Reference Material 2648

Propane in Nitrogen

(Nominal Concentration 5000 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary standard to which

the concentration of the daily working standards may be related.

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the propane concentration at the 95 percent confidence level. This uncertainty includes the inaccuracy of

the gravimetric primary standards and the imprecision of intercomparison with the gravimetric standards. This sample is

certified only for the concentration of propane. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as propane, is

The content of each cylinders individually analyzed and the concentration appearing above is the measured value for

the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported by the

Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

May 30, 1980 Office of Standard Reference Materials

Propane concentration:

Cylinder Number:

/jmole/ mole (ppm)

Sample Number:

/jmole/mole (ppm).

(over)

199
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration has been

observed in similar samples contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years fron\date of purchase. Periodic reanalyses of representative samples from this lot will be

performed at NBS, and if significant changes are observed within the 2 year period, purchasers of the SRM will be

notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 1 2.4 MPa ( 1 800 psi) with a deliverable volume of0.88 m

3 (3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 2648

200
U. S. Department of Commerce

Philip M. Klutznick

Secretary

National Bureau of Standards

Ernest Ambler. Director

Rational ^vtttmx of j&tattdarfta

(Eerttfitate of J^nal^st*

Standard Reference Material 2649

Propane in Nitrogen

(Nominal Concentration 10,000 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary standard to which

the concentration of the daily working standards may be related.

Propane concentration:

Cylinder Number:

/umole/ mole (ppm)

Sample Number:

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the propane concentration at the 95 percent confidence level. This uncertainty includes the inaccuracy of

the gravimetric primary standards and the imprecision of intercomparison with the gravimetric standards. This sample is

certified only for the concentration of propane. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as propane, is /umole/mole (ppm).

The content of each cylinder is individually analyzed and the concentration appearing above is the measured value for

the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported by the

Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234

May 30, 1980

George A. Uriano, Chief

Office of Standard Reference Materials

(over)

201
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration has been

observed in similar samples contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative samples from this lot will be

performed at NBS, and if significant changes are observed within the 2 year period, purchasers of the SRM will be

notified.

Cylinder

This S RM is supplied in cylinders at a pressure of 1 2.4 MPa ( 1 800 psi) with a deliverable volume of0.88 m

3 (3 1 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 2649

202
. s. intent of Commerce

M. Klutznick

National

Efatat

Rational ^Bureau of jUtattdartte

(dtttiiitntt of ^nal^st*

Standard Reference Material 2650

Propane in Nitrogen

(Nominal Concentration 20,000 ppm)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of hydrocarbon in mobile-source emissions. It is not intended as a working standard, but rather as a primary standard to which

the concentration of the daily working standards may be related.

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the estimated upper

limit of error of the propane concentration at the 95 percent confidence level. This uncertainty includes the inaccuracy of

the gravimetric primary standards and the imprecision of intercomparison with the gravimetric standards. This sample is

certified only for the concentration of propane. However, representative samples from the lot have been examined for the

presence of other hydrocarbons. The estimated concentration of other hydrocarbons, expressed as propane, is

The content of each cylinder is individually analyzed and the concentration appearing above is the measured value for

the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported by the

Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

May 30, 1980 Office of Standard Reference Materials

Propane concentration:

Cylinder Number:

/ttmole / mole (ppm)

Sample Number:

/imole/mole (ppm).

(over)

203
Analysis

The concentration of propane in this Standard Reference Material was determined by comparison with a set of gravimetric primary standards. The intercomparisons were performed using a gas chromatograph equipped with a flame

ionization detector.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration has been

observed in similar samples contained in aluminum cylinders. However, the value appearing on this certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative samples from this lot will be

performed at NBS, and if significant changes are observed within the 2 year period, purchasers of the SRM will be

notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (3 1 cubic feet)

at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM 265C

204
U. S. Department of Commerce

Philip M. KJutznick

Secretary

National Burwa of Standards

Ernest Ambler, Director V

Rational ££ttram of jitandards

Certificate of (Analysis

Standard Reference Material 2651

Propane in Nitrogen and Oxygen

(Nominal 100 ppm Propane and Five Percent Oxygen)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

hydrocarbon in mobile-source emissions when the oxygen content of the calibration gas is of concern. It is not intended as a working standard, but rather as a primary standard to which the concentration of the daily

working standards may be related.

Propane concentration: ± j/mole/ mole (ppm)

Cylinder Number: Sample Number:

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the propane concentration at the 95 percent confidence level. This uncertainty

includes the inaccuracy of the gravimetric primary standards and the imprecision of intercomparison with the

gravimetric standards. This sample is certified only for the concentration of propane. However, representative

samples from the lot have been examined for oxygen concentration and for the presence of other hydrocarbons.

The oxygen concentration is given below:

Oxygen concentration: ± mole percent

The estimated concentration of other hydrocarbons, expressed as propane, is /umole/mole (ppm).

I he remainder of the sample is nitrogen.

The content of each cylinder is individually analyzed and the concentration of propane appearing above is the

measured value for the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and

W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

July 16, 1980 Office of Standard Reference Materials

(over)

205
Preparation

The samples in this lot were originally prepared by a commercial supplier under contract from the NBS, as a bulk mixture which was then transferred into the cylinders in the lot. The minimum lot size is 26 cylinders. The

preparation and transfer of the mixture is conducted in a manner to assure homogeneity among all samples in

the lot.

Analysis

The concentration of propane in each sample in the lot was determined by comparison with a set of primary

gravimetric standards. The analyses were performed using a gas chromatograph equipped with a flame

ionization detector. The results of this analysis indicated a high degree of homogeneity within the lot. Consequently, only ten percent of the samples were analyzed for oxygen. The analyses were performed with an

analyzer that responds to the paramagnetic properties of oxygen which had been calibrated with gravimet rically

prepared standards. All of the samples analyzed were found to have the same oxygen content.

The value for the estimated other hydrocarbons was determined by detailed gas chromatographic measurements

on two samples from the lot.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at N BS, and if significant changes are observed within the 2 year period,

purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 M Pa (1800 psi) with a deliverable volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 2651

206
U. S. Department of Commerce

Philip M. Klutznick

Secretary

National Bureau of Standards

Ernest Ambler, Director

Rational ^mtm af j^tattdards

Certificate of ^ttalgst*

Standard Reference Material 2652

Propane in Nitrogen and Oxygen

(Nominal 100 ppm Propane and Ten Percent Oxygen)

(Mobile-Source Emission Gas Standard)

(In Cooperation with the Motor Vehicle Manufacturers Association)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of

hydrocarbon in mobile-source emissions when the oxygen content of the calibration gas is of concern. It is not intended as a working standard, but rather as a primary standard to which the concentration of the daily

working standards may be related.

Propane concentration: + jzmole/ mole (ppm)

Cylinder Number: Sample Number:

The concentration of propane is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the propane concentration at the 95 percent confidence level. This uncertainty

includes the inaccuracy of the gravimetric primary standards and the imprecision of intercomparison with the

gravimetric standards. This sample is certified only for the concentration of propane. However, representative

samples from the lot have been examined for oxygen concentration and for the presence of other hydrocarbons.

The oxygen concentration is given below:

Oxygen concentration: ± mole percent

The estimated concentration of other hydrocarbons, expressed as propane, is /umole/mole (ppm).

The remainder of the sample is nitrogen.

The content of each cylinder is individually analyzed and the concentration of propane appearing above is the

measured value for the cylinder and sample identified on this certificate.

The research and development leading to the certification of this Standard Reference Material were supported

by the Motor Vehicle Manufacturers Association of the United States, Inc. (MVMA), Detroit, Michigan.

The development and evaluation of the gravimetric primary standards used to certify this Standard Reference

Material were performed at the National Bureau of Standards by MVMA Research Associates W. R. Miller and

W. J. Thorn.

The overall direction and coordination of the technical measurements leading to certification were performed

under the chairmanship of E. E. Hughes and H. L. Rook of the NBS Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Mateiitil were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington. D.C. 20234

July 16. 19X0

(over)

207

George A. Uriano, Chief

Office of Standard Reference Materials
Preparation

The samples in this lot were originally prepared by a commercial supplier under contract from the NBS, as a

bulk mixture which was then transferred into the cylinders in the lot. The minimum lot size is 26 cylinders. The

preparation and transfer of the mixture is conducted in a manner to assure homogeneity among all samples in

the lot.

Analysis

The concentration of propane in each sample in the lot was determined by comparison with a set of primary

gravimetric standards. The analyses were performed using a gas chromatograph equipped with a flame

ionization detector. The results of this analysis indicated a high degree of homogeneity within the lot. Consequently, only ten percent of the samples were analyzed for oxygen. The analyses were performed with an

analyzer that responds to the paramagnetic properties of oxygen which had been calibrated with gravimetrically

prepared standards. All of the samples analyzed were found to have the same oxygen content.

The value for the estimated other hydrocarbons was determined by detailed gas chromatographic measurements

on two samples from the lot.

Stability

This SRM is contained in an aluminum cylinder. The stability is considered good and no loss of concentration

has been observed in similar samples contained in aluminum cylinders. However, the value appearing on this

certificate is considered valid for only 2 years from date of purchase. Periodic reanalyses of representative

samples from this lot will be performed at NBS, and if significant changes are observed within the 2 year period,

purchasers of the SRM will be notified.

Cylinder

This SRM is supplied in cylinders at a pressure of 12.4 MPa (1800 psi) with a deliverable volume of 0.88 m

3 (31

cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-350 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM 2652

208
U. S. Department of Commerce

Malcolm Baldrige

^ecmary^

National pur«s>i ol* Standards

Ernest lAmbler. Director

Rational ^mtm of jltandartte

(ttwrttfttate of ^ital^sfe

Standard Reference Material 2653

Nitrogen Dioxide in Air

(Nominal Concentration 250 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of nitrogen

dioxide in stationary source emissions. It is not intended as a working standard, but rather as a primary laboratory

standard to which the concentration of other standards may be related.

The concentration of nitrogen dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitrogen dioxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified

by cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas handling system.

The original development and evaluation of this Standard Reference Material was performed in the Gas and Particulate

Science Division by W. D. Dorko and G. Rhoderick.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

June 7, 1982 Office of Standard Reference Materials

Nitrogen dioxide concentration:

Cylinder Number: Sample Number:

+ /xmole/ mole(ppm)

(over)

209
J

Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that the lot is homogeneous and stable. Each cylinder

in the lot is individually analyzed at NBS for nitrogen dioxide content.

Analysis

The nitrogen dioxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously compared with a set of primary gravimetric standards of nitric oxide in nitrogen. The

method of comparison utilized the chemiluminescent reaction of nitric oxide with ozone after the nitrogen dioxide had

been catalytically converted to nitric oxide. The analysis was carefully evaluated to avoid errors arising from the use of

nitric oxide in nitrogen standards to analyze nitrogen dioxide in air samples.

Stability

Loss of nitrogen dioxide by adsorption on the container walls may occur in new cylinders not previously used for

nitrogen dioxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders. The

use of this preconditioning procedure may result in desorption of nitrogen dioxide from the cylinder walls when the

cylinder pressure is reduced. It is not recommended that the sample be used for accurate analyses at cylinder pressures

below 2.8 M Pa (400 psi).

The concentration on this certificate is valid for one year from the date of purchase from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within one year,

the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders conform to

DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser.

SRM 2653

Page 2

210
U. S. Department 'oi Commerce

Malcolovfialdrige

National luraatt dr$tandards

Ernest Umbfcr. Dircdor

Rational ^Sumu af jltattdartfe

Certificate of JVnalgsi*

Standard Reference Material 2654

Nitrogen Dioxide in Air

(Nominal Concentration 500 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of nitrogen

dioxide in stationary source emissions. It is not intended as a working standard, but rather as a primary laboratory

standard to which the concentration of other standards may be related.

The concentration of nitrogen dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitrogen dioxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified

by cylinder number and sample number on this certificate. CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas handling system.

The original development and evaluation of this Standard Reference Material was performed in the Gas and Particulate

Science Division by W. D. Dorko and G. Rhoderick.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

June 7, 1982 Office of Standard Reference Materials

Nitrogen dioxide concentration:

Cylinder Number: Sample Number:

+ pmole / mole(ppm)

(over)

211
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that the lot is homogeneous and stable. Each cylinder

in the lot is individually analyzed at NBS for nitrogen dioxide content.

Analysis

The nitrogen dioxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously compared with a set of primary gravimetric standards of nitric oxide in nitrogen. The

method of comparison utilized the chemiluminescent reaction of nitric oxide with ozone after the nitrogen dioxide had

been catalytically converted to nitric oxide. The analysis was carefully evaluated to avoid errors arising from the use of

nitric oxide in nitrogen standards to analyze nitrogen dioxide in air samples.

Stability

Loss of nitrogen dioxide by adsorption on the container walls may occur in new cylinders not previously used for

nitrogen dioxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders. The

use of this preconditioning procedure may result in desorption of nitrogen dioxide from the cylinder walls when the

cylinder pressure is reduced. It is not recommended that the sample be used for accurate analyses at cylinder pressures

below 2.8 M Pa (400 psi).

The concentration on this certificate is valid for one year from the date of purchase from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within one year,

the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser,

SRM 2654

Page 2

212
U. S. Department of Commerce

Malcolm Bald ngc

'SecVelaryi7

National BuimuoTStandards

Ernest l^mbler. Director

Rational £Suram of Standards

Certificate of Analysis

Standard Reference Material 2655

Nitrogen Dioxide in Air

(Nominal Concentration 1000 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of nitrogen

dioxide in stationary source emissions. It is not intended as a working standard, but rather as a primary laboratory

standard to which the concentration of other standards may be related.

The concentration of nitrogen dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitrogen dioxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified

by cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas handling system.

The original development and evaluation of this Standard Reference Material was performed in the Gas and Particulate

Science Division by W. D. Dorko and G. Rhoderick.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

June 7, 1982 Office of Standard Reference Materials

Nitrogen dioxide concentration:

Cylinder Number: Sample Number:

+ /xmole / mole(ppm)

(over)

213
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that the lot is homogeneous and stable. Each cylinder

in the lot is individually analyzed at NBS for nitrogen dioxide content.

Analysis

The nitrogen dioxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously compared with a set of primary gravimetric standards of nitric oxide in nitrogen. The

method of comparison utilized the chemiluminescent reaction of nitric oxide with ozone after the nitrogen dioxide had

been catalytically converted to nitric oxide. The analysis was carefully evaluated to avoid errors arising from the use of

nitric oxide in nitrogen standards to analyze nitrogen dioxide in air samples.

Stability

Loss of nitrogen dioxide by adsorption on the container walls may occur in new cylinders not previously used for

nitrogen dioxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders. The

use of this preconditioning procedure may result in desorption of nitrogen dioxide from the cylinder walls when the

cylinder pressure is reduced. It is not recommended that the sample be used for accurate analyses at cylinder pressures

below 2.8 MPa (400 psi).

The concentration on this certificate is valid lor one year from the date of purchase from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within one year,

the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser.

SRM 2655

Page 2

214
U. S. Department of Commerce

Malcolm Baldrige

^Secretary?

National bureau of Standards

Ernest Ambler. Director

Rational ^mtnn of Standards

(&ttt\i\tntt of £itm\\tzx*

Standard Reference Material 2656

Nitrogen Dioxide in Air

(Nominal Concentration 2500 ppm)

(Stationary Source Emission Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for the analysis of nitrogen

dioxide in stationary source emissions. It is not intended as a working standard, but rather as a primary laboratory

standard to which the concentration of other standards may be related.

Nitrogen dioxide concentration: ± jtmole/mole(ppm)

Cylinder Number: Sample Number:

The concentration of nitrogen dioxide is relative to all other constituents of the gas. The uncertainty shown is the

estimated upper limit of error of the nitrogen dioxide concentration and is the 95 percent confidence interval based on

allowances for known sources of possible error.

Each cylinder of gas is individually analyzed, and the concentration given above applies only to the cylinder identified

by cylinder number and sample number on this certificate.

CAUTION: Care must be taken to avoid accidental contamination of the sample during the use of the cylinder with any

gas handling system.

The original development and evaluation of this Standard Reference Material was performed in the Gas and Particulate

Science Division by W. D. Dorko and G. Rhoderick.

The overall direction and coordination of the technical measurements leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook of the Gas and Particulate Science Division.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by T. E. Gills.

Washington, D.C. 20234 George A. Uriano, Chief

June 7, 1982 Office of Standard Reference Materials

(over)

215
Certification Information

The cylinder identified on this certificate is one of a group or "lot" of cylinders. A lot contains a minimum of 26 cylinders

and is prepared commercially according to rigid specifications so that the lot is homogeneous and stable. Each cylinder

in the lot is individually analyzed at NBS for nitrogen dioxide content.

Analysis

The nitrogen dioxide content of this Standard Reference Material was determined by comparison with secondary

standards that had been previously compared with a set of primary gravimetric standards of nitric oxide in nitrogen. The

method of comparison utilized the chemiluminescent reaction of nitric oxide with ozone after the nitrogen dioxide had

been catalytically converted to nitric oxide. The analysis was carefully evaluated to avoid errors arising from the use of

nitric oxide in nitrogen standards to analyze nitrogen dioxide in air samples.

Stability

Loss of nitrogen dioxide by adsorption on the container walls may occur in new cylinders not previously used for

nitrogen dioxide mixtures. To ensure stability, a moderate preconditioning procedure was used for these cylinders. The

use of this preconditioning procedure may result in desorption of nitrogen dioxide from the cylinder walls when the

cylinder pressure is reduced. It is not recommended that the sample be used for accurate analyses at cylinder pressures

below 2.8 MPa (400 psi).

The concentration on this certificate is valid for one year from the date of purchase from NBS. Periodic reanalyses of

representative samples from this lot will be performed at NBS, and if significant changes are observed within one year,

the purchasers of samples from the lot will be notified.

Cylinder

This SRM is supplied in cylinders with a deliverable volume of 0.85 m

3 (30 cubic feet) at STP. The cylinders conform to

DOT specifications and are equipped with CGA-660 valves.

The cylinder becomes the property of the purchaser.

SRM 2656

Page 2

216
l .S. Department of Commerce

•luanita M. Kreps

Secretary

National Bureau of Standards

Krnest Aniblrr. Director

Rational JSwreau of j^tandartte

Certificate of ^nal^i*

Standard Reference Material 2657

Oxygen in Nitrogen

(Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for combustion

control and respiratory gas analysis. It is not intended as a daily working standard, but rather as a primary

standard to which the concentration of the daily working standards may be related.

The concentration of oxygen is relative to all other constituents of the gas.

Each cylinder is individually analyzed and the concentration that appears on this certificate applies to the

cylinder identified by cylinder and sample number.

The original development and evaluation of the oxygen in nitrogen series of Standard Reference Materials were performed at the National Bureau of Standards by W. D. Dorko and W. P. Schmidt.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by R. Alvarez.

Washington, D.C. 20234 George A. Uriano, Chief

December 3 1 , 1979 Office of Standard Reference Materials

Oxygen concentration:

Cylinder Number: Sample Number:

mole percent

(over)

217
Analysis:

The concentration of oxygen in this Standard Reference Material was determined by comparison with a set of

gravimetric primary standards. The intercomparisons were performed using both a gas chromatograph

equipped with a thermal conductivity detector and an analyzer sensitive to the paramagnetic properties of

oxygen. The uncertainty shown is based on an estimate of the upper limit of the total uncertainty including the

inaccuracy of the gravimetric primary standards and the imprecision of intercomparison of the Standard

Reference Material with the gravimetric standards. This uncertainty at the 95%confidence level does not exceed

1.0% relative.

This sample is certified only for the concentration of oxygen.

A representative number of samples were examined to determine the argon concentration and it is estimated to

be mole percent.

Stability:

This SRM is contained in an aluminum cylinder. The stability is considered good and no change in

concentration is anticipated. However, the value appearing on this certificate is considered valid for only 2 years

from date of purchase. Periodic reanalyses of representative samples from this lot will be performed at NBS, and

if significant changes are observed within the 2 year period, purchasers of the SRM will be notified.

Cylinder:

• 3 This SRM is supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m (31 cubic

feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal

SRM

2657

218
U.S. Department of Commerce

Juanita M. Kreps

Secretary

National Bureau of Standards

Krnest Ambler. Director

Rational uresis of js»ta*tdartte

Certificate of JVnaljwis

Standard Reference Material 2658

Oxygen in Nitrogen

(Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for combustion

control and respiratory gas analysis. It is not intended as a daily working standard, but rather as a primary

standard to which the concentration of the daily working standards may be related.

Oxygen concentration: ± mole percent

Cylinder Number: Sample Number:

The concentration of oxygen is relative to all other constituents of the gas.

Each cylinder is individually analyzed and the concentration that appears on this certificate applies to the

cylinder identified by cylinder and sample number.

The original development and evaluation of the oxygen in nitrogen series of Standard Reference Materials were performed at the National Bureau of Standards by W. D. Dorko and W. P. Schmidt.

The overall direction and coordination of technical measurements leading to certification were performed under

the chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard

Reference Material were coordinated through the Office of Standard Reference Materials by R. Alvarez.

Washington, D.C. 20234 George A. Uriano, Chief

December 31, 1979 Office of Standard Reference Materials

(over)

219
Analysis:

The concentration of oxygen in this Standard Reference Material was determined by comparison with a set of

gravimetric primary standards. The intercomparisons were performed using both a gas chromatograph

equipped with a thermal conductivity detector and an analyzer sensitive to the paramagnetic properties of

oxygen. The uncertainty shown is based on an estimate of the upper limit of the total uncertainty including the

inaccuracy of the gravimetric primary standards and the imprecision of intercomparison of the Standard

Reference Material with the gravimetric standards. This uncertainty at the 95% confidence level does not exceed

1.0% relative.

This sample is certified only for the concentration of oxygen.

A representative number of samples were examined to determine the argon concentration and it is estimated to be mole percent.

Stability:

This SRM is contained in an aluminum cylinder. The stability is considered good and no change in

concentration is anticipated. However, the value appearing on this certificate is considered valid for only 2 years

from date of purchase. Periodic reanalyses of representative samples from this lot will be performed at NBS, and

if significant changes are observed within the 2 year period, purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at 12.4 MPa (1800 psi) pressure with a delivered volume of 0.88 m

3 (31 cubic

feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National

Bureau of Standards for disposal.

SRM

2658

220
U. S. Department of Commerce

Philip M, Kiutznick

National

Ernest

landardi

-ector

Rational ^nttm of jjttatulartfe

Certificate of ^naljjsi*

Standard Reference Material 2659

Oxygen in Nitrogen

21 Mole Percent (Nominal)

(Gas Standard)

This Standard Reference Material is intended for use in the calibration of instruments used for combustion control,

respiratory gas analysis, and atmospheric analysis. It is not intended as a daily working standard, but rather as a primary

standard to which the concentration of the daily working standards may be related.

The concentration of oxygen is relative to all other constituents of the gas.

Each cylinder is individually analyzed and the concentration that appears on this certificate applies to the cylinder

identified by cylinder and sample number.

The original development and evaluation of the oxygen in nitrogen series of Standard Reference Materials were performed at the National Bureau of Standards by W.D. Dorko and G. Rhoderick.

The overall direction and coordination of technical measurements leading to certification were performed under the

chairmanship of E.E. Hughes and H.L. Rook.

The technical and support aspects involved in the preparation, certification, and issuance of this Standard Reference

Material were coordinated through the Office of Standard Reference Materials by R. Alvarez.

Washington, D.C. 20234 George A. Uriano, Chief

December 31, 1980 Office of Standard Reference Materials

Oxygen concentration:

Cylinder Number: Sample Number:

+ mole percent

(over)

221
Analysis:

The concentration of oxygen in this Standard Reference Material was determined by comparison with a set of

gravimetric primary standards. The intercomparisons were performed using both a gas chromatograph equipped with a thermal conductivity detector and an analyzer sensitive to the paramagnetic properties of oxygen. The uncertainty

shown is based on an estimate of the upper limit of the total uncertainty including the inaccuracy of the gravimetric

primary standards and the imprecision of intercomparison of the Standard Reference Material with the gravimetric

standards. This uncertainty at the 95% confidence level does not exceed 1.0% relative.

This sample is certified only for the concentration of oxygen.

A representative number of samples were examined to determine the argon concentration and it is estimated to

be mole percent.

Stability:

This SRM is contained in an aluminum cylinder. The stability is considered good and no change in concentration is anticipated. However, the value appearing on this certificate is considered valid for only 2 years from date of purchase.

Periodic reanalyses of representative samples from this lot will be performed at NBS, and if significant changes are observed within the 2-year period, purchasers of the SRM will be notified.

Cylinder:

This SRM is supplied in cylinders at about 12.4 MPa (1800 psi) pressure with a delivered volume of approximately

0.88 m (31 cubic feet) at STP. The cylinders conform to DOT specifications and are equipped with CGA-580 valves.

The cylinders become the property of the purchaser. However, they may be returned, prepaid, to the National Bureau of

Standards for disposal.

SRM

2659

222
APPENDIX II

CERTIFICATES FOR PERMEATION TUBE STANDARD REFERENCE MATERIALS
i
U. S. Department of Commerce

Frederick B. Dent

Secretary

*. National Buna* «3f Standards

Richard W. Raberti, Director

Rational ^ntmn of j^tandartte

(Uttttixtatt

Standard Reference Material 1625

Sulfur Dioxide Permeation Tube

(Individually Calibrated)

E. E. Hughes and W. P. Schmidt

This Standard Reference Material consists of a 10 cm sulfur dioxide permeation tube, individually calibrated, for use in the preparation of gases of known sulfur dioxide content. It is intended

for standardization of apparatus and procedures used in air pollution and related chemical analyses.

The permeation rates for temperatures in the range of 20 to 30 °C are given in the table accompanying each tube.

The tabulated values result from determinations of the permeation rates for the specified tube,

using the method described on the reverse of this certificate. The uncertainty of the certified

permeation rates, based on the results of the calibration of approximately 50 tubes, is less than

±0.5 percent at 25 °C and does not exceed ±1.0 percent at 20 and 30 °C, respectively.

Experiments in this laboratory have shown that the calibration remains valid as long as visible

amounts of liquid sulfur dioxide remain in the tube.

The calibration measurements were made by E. E. Hughes and W. P. Schmidt, Analytical Chemistry Division, NBS Institute for Materials Research.

The overall direction and coordination of the technical measurements leading to certification

were performed under the chairmanship of J. K. Taylor.

The technical and support aspects involved in the preparation, certification, and issuance of this

Standard Reference Material were coordinated through the Office of Standard Reference Materials

by T. W. Mears.

Washington, D.C. 20234 J. Paul Cali, Chief

December 1, 1970 Office of Standard Reference Materials

(Revised January 5, 1973)

(over)

225
CALIBRATION

This tube was individually calibrated by gravimetric determination of weight losses at 20, 25,

and 30 °C, respectively. The tube was held at constant temperature for several days at each level,

and the permeation rate was determined by weighing the tubes at 24-hour intervals, using a microbalance. The measured rates were fitted by the method of least squares to an equation of the type

log R = mt + b. The resulting equation, given on the table accompanying the tube, was used to

calculate the values of the permeation rates and may be used to calculate values not given, for

temperatures not more than 2 °C beyond the range in the table.

The precision of calibration was estimated from measurements on approximately 25 tubes in this

lot at each calibration temperature. The uncertainties indicated are the approximate half width of

the 95 percent confidence interval. It is believed that the systematic errors concerned with the

calibration are negligible.

USE

This tube can be used to produce known concentrations of sulfur dioxide in a gas stream when

both the temperature and flow rate of the gas stream are known. Apparatus and techniques for this

purpose are described in reference [3] and [4] and should be consulted for operational details.

Because of the large temperature coefficient of the permeation rate, approximately 9 percent per

degree celsius, the temperature must be maintained constant and measured accurately to 0.1 °C to

provide concentrations consistent with the calibration uncertainty.

It is recommended that the tube temperature be held constant during use and that desired

concentration levels be achieved by adjustment of the flow rate. If it is necessary to vary the

concentration by changing the tube temperature, a suitable time interval must be allowed for

equilibrium of the permeation rate to be re-established. For changes of 1 or 2 degrees Celsius, a period of 3 hours should suffice. For changes of 10 degrees or when removed from low temperature

storage, a period of 24 hours is advisable.

This permeation tube is a stable and relatively rugged source of sulfur dioxide and no extreme

measures are necessary to ensure that the calibration of the tube will be maintained during its useful

life. However, it should be treated with the care necessary to assure the user that no change occurs

in the character of the tube. Precautions should be exercised to prevent contamination of the outer

surface during handling. The tube should be protected from high concentrations of water vapor

during storage and use. A relative humidity of 10 percent should have no effect on the permeation

rate within the calibration uncertainty.

STORAGE

The useful life of this certified sulfur dioxide permeation tube is about 9 months. Storage at

lower temperatures will prolong the life. However, it should be protected from moisture during

storage. On removal from low temperature storage, the tube should be equilibrated at the operating

temperature for at least 24 hours before use as an analytical standard.

PRECAUTION

This permeation tube contains liquid sulfur dioxide at a pressure of about 4 atmospheres at

room temperature. While no failures have occured during use, there is the possibility of rupture due

to internal pressure. However, it is believed that normal handling of the tubes at temperatures up to

and slightly exceeding 35 °C does not constitute a hazard.

SELECTED REFERENCES

[1] A. E. O'Keefe and G. C. Ortman, Anal. Chem 38, 760 (1966).

[2] F. P. Scarringelli, S. A. Frey, and B. E. Saltzman, Amer. Ind. Hyg. Assoc. J. 28, 260 (1967).

[3] Health Laboratory Science 7, No. 1, 4 (1970).

[4] F. P. Scarringello, A. E. O'Keefe, E. Rosenbert, and J. P. Bell, Anal. Chem. 42, 871 (1970).

[5] J. K. Taylor, Ed., NBS Technical Note 545, December 1970.

226
U. S. DepartriAen^ of Commerce

Maurice H. Stans

National BAresif «fl Standards

L. M. BraitBe&nb. Director

Rational ^vctmn of ^tnndntdz

Standard Reference Material 1626

Sulfur Dioxide Permeation Tube

(Individually Calibrated)

This Standard Reference Material consists of a 5 cm sulfur dioxide permeation tube, individually

calibrated, for use in the preparation of gases of known sulfur dioxide content. It is intended for

standardization of apparatus and procedures used in air pollution and related chemical analyses.

Permeation rates for temperatures in the range of 20 to 30 °C are given in the table accompanying

each tube.

The tabulated values result from determinations of the permeation rates for the specified tube,

using the method described on the reverse of this certificate. The uncertainty of the certified

permeation rates, based on the results of the calibration of approximately 25 tubes, is less than

± 0.5 percent at 25 °C and does not exceed ±1.0 percent at 20 and 30 °C, respectively.

Experiments in this laboratory have shown that the calibration remains valid as long as visible

amounts of liquid sulfur dioxide remain in the tube.

The calibration measurements were made by E. E. Hughes and W. P. Schmidt, Analytical Chemistry Division, NBS Institute for Materials Research.

The overall direction and coordination of the technical measurements leading to certification

were performed under the chairmanship of J. K. Taylor.

The technical and support aspects involved in the preparation, certification, and issuance of this

Standard Reference Material were coordinated through the Office of Standard Reference Materials

by T. W. Mears.

Washington, D. C. 20234

August 12, 1971

J. Paul Cali, Chief

Office of Standard Reference Materials

(over)

227
CALIBRATION

This tube was individually calibrated by gravimetric determination of weight losses at 20, 25,

and 30 °C, respectively. The tube was held at constant temperature for several days at each level,

and the permeation rate was determined by weighing the tubes at 24-hour intervals, using a microbalance. The measured rates were fitted by the method of least squares to an equation of the type

log R = mt + b. The resulting equation, given on the table accompanying the tube was used to

calculate the values of the permeation rates.

The precision of calibration was estimated from measurements on approximately 25 tubes in this

lot at each calibration temperature. The uncertainties indicated are the approximate half width of

the 95 percent confidence interval. It is believed that the systematic errors concerned with the

calibration are negligible.

USE

This tube can be used to produce known concentrations of sulfur dioxide in a gas stream when

both the temperature and flow rate of the gas stream are known. Apparatus and techniques for this

purpose are described in references [3] and [4] and should be consulted for operational details.

Because of the large temperature coefficient of the permeation rate, approximately 9 percent per

degree Celsius, the temperature must be maintained constant and measured accurately to 0.1 °C to

provide concentrations consistent with the calibration uncertainty.

It is recommended that the tube temperature be held constant during use and that desired

concentration levels be achieved by adjustment of the flow rate. If it is necessary to vary the

concentration by changing the tube temperature, a suitable time interval must be allowed for

equilibrium of the permeation rate to be re-established. For changes of 1 or 2 degrees Celsius, a period of 3 hours should suffice. For changes of 10 degrees or when removed from low temperature

storage, a period of 24 hours is advisable. ,

This permeation tube is a stable and relatively rugged source of sulfur dioxide and no extreme

measures are necessary to ensure that the calibration of the tube will be maintained during its useful

life. However, it should be treated with the care necessary to assure the user that no change occurs

in the character of the tube. Precautions should be exercised to prevent contamination of the outer

surface during handling. The tube should be protected from high concentrations of water vapor

during storage and use. A relative humidity of 10 percent should have no effect on the permeation

rate within the calibration uncertainty.

STORAGE

The useful life of this certified sulfur dioxide permeation tube is about 9 months. Storage at

lower temperatures will prolong the life. However, it should be protected from moisture during

storage. On removal from low temperature storage, the tube should be equilibrated at the operating

temperature for at least 24 hours, before use as an analytical standard.

PRECAUTION

This permeation tube contains liquid sulfur dioxide at a pressure of about 4 atmospheres at

room temperature. While no failures have occured during use, there is the possibility of rupture due

to internal pressure. However, it is believed that normal handling of the tubes at temperatures up to

and slightly exceeding 35 °C does not constitute a hazard.

SELECTED REFERENCES

[1 j A. E. O'Keeffe and G. C. Ortman, Anal. Chem. 38, 760 (1966).

[2] F. P. Scaringelli, S. A. Frey, and B. E. Sallzman, Amer. hid. Hyg. Assoc; J. 28, 260 (1967).

[3 J Health Laboratory Science 7, No. L, 4 (1970).

[4] F. 1\ Scaringelli. A. E. O'Keeffe, E. Rosenberg, and J. P. Bell, Anal. Chem. 42, 871 (1970).

[5] J. K. Taylor, Ed., NBS Technical Note 545, December 1970.

228
U. S. Department' of Commerce

MauriceiS. Stens

National

L. M

Rational J^uram of jltandartte

Standard Reference Material 1627

Sulfur Dioxide Permeation Tube

(Individually Calibrated)

E. E. Hughes and W. P. Schmidt

This Standard Reference Material consists of a 2 cm sulfur dioxide permeation tube, individually

calibrated, for use in the preparation of gases of known sulfur dioxide content. It is intended for

standardization of apparatus and procedures used in air pollution and related chemical analyses. The

permeation rates for temperatures in the range of 20 to 30 °C are given in the table accompanying

each tube.

The tabulated values result from determinations of the permeation rates for the specified tube,

using the method described on the reverse of this certificate. The uncertainty of the certified

permeation rates, based on the results of the calibration of approximately 25 tubes, is less than

±1.0 percent at 25 °C and does not exceed ± 2.0 percent at 20 and 30 °C, respectively.

Experiments in this laboratory have shown that the calibration remains valid as long as visible

amounts of liquid sulfur dioxide remain in the tube.

The calibration measurements were made by E. E. Hughes and W. P. Schmidt, Analytical Chemistry Division, NBS Institute for Materials Research.

The overall direction and coordination of the technical measurements leading to certification

were performed under the chairmanship of J. K. Taylor.

The technical and support aspects involved in the preparation, certification, and issuance of this

Standard Reference Material were coordinated through the Office of Standard Reference Materials

by T. W. Mears.

Washington, D. C. 20234 J. Paul Cali, Chief

August 12, 1971 Office of Standard Reference Materials

(over)

229
CALIBRATION

This lube was individually calibrated by gravimetric determination of weight losses at 20, 25,

and 30 °C,' respectively. The tube was held at constant temperature for several days at each level,

and the permeation rate was determined by weighing the lubes at 24-hour intervals, using a microbalance. The measured rates were fitted by the method of least squares to an equation of the type

log K = ml + b. The resulting equation, given on the table accompanying the tube, was used to

calculate the values of the permeation rates.

The precision of calibration was estimated from measurements on approximately 25 tubes in this

lot at each calibration temperature. The uncertainties indicated are the approximate half width of

the 95 percent confidence interval. It is believed that the systematic errors concerned with the

calibration are negligible.

USE

This tube can be used to produce known concentrations of sulfur dioxide in a gas stream when

both the temperature and flow rate of the gas stream are known. Apparatus and techniques for this

purpose are described in references [3] and [4] and should be consulted for operational details.

Because of the large temperature coefficient of the permeation rate, approximately 9 percent per

degree celsius, the temperature must be maintained constant and measured accurately to 0.1 °C to

provide concentrations consistent with the calibration uncertainty.

It is recommended that the tube temperature be held constant during use and that desired

concentration levels be achieved by adjustment of the flow rate. If it is necessary to vary the

concentration by changing the tube temperature, a suitable time interval must be allowed for

equilibrium of the permeation rate to be re-established. For changes of 1 or 2 degrees celsius, a period of 3 hours should suffice. For changes of 10 degrees or when removed from low temperature

storage, a period of 24 hours is advisable.

This permeation tube is a stable and relatively rugged source of sulfur dioxide and no extreme

measures are necessary to ensure that the calibration of the tube will be maintained during its useful

life. However, it should be treated with the care necessary to assure the user that no change occurs

in the character of the tube. Precautions should be exercised to prevent contamination of the outer

surface during handling. The tube should be protected from high concentrations of water vapor

during storage and use. A relative humidity of 10 percent should have no effect on the permeation

rate within the calibration uncertainty.

STORAGE

The useful life of this certified sulfur dioxide permeation tube is about 9 months. Storage at lower temperatures will prolong the life. However, it should be protected from moisture during

storage. On removal from low temperature storage, the tube should be equilibrated at the operating

temperature for at least 24 hours, before use as an analytical standard.

PRECAUTION

This permeation tube contains liquid sulfur dioxide at a pressure of about 4 atmospheres at room temperature. While no failures have occured during use, there is the possibility of rupture due

to internal pressure. However, it is believed that normal handling of the tubes at temperatures up to

and slighth exceeding 35 °C does not constitute a hazard.

SELECTED REFERENCES

[lj A. E. O'kceffe andC. C. Ortman, Anal. Chem. 38, 760 (1966).

[2] F. P. Scaringelli, S. A. Frey, and B. E. Saltzman, Amer. Ind. Hyg. Assoc. J. 28, 260 (1967).

[3] Health Laboratory Science 7, No. 1, 4 (1970).

[4] F. P. Scaringelli, A. E. O'Keeffe, E. Rosenberg, and J. P. Bell, Anal. Chem. 42, 871 (1970).

[5] J. K. Taylor, Ed., NBS Technical Note 545, December 1970.

230
U. S. Departmerit 'of Commerce

Malcoltgjtoldrige

'Becmafy

National (uraajtoT! Itandardi Ernest Umbfcr. Director

Rational ^nttnn of ^tnnthxtd*

(Ewrtifitafc of Calibration

Standard Reference Material 1629a

Nitrogen Dioxide Permeation Device

This Standard Reference Material consists of a nitrogen dioxide permeation device, individually calibrated, for use in the

preparation of gases of known nitrogen dioxide content. It is intended for the standardization of apparatus and

procedures used in air pollution and related chemical analyses.

The uncertainty given for this value is the 95 percent confidence limit of the mean based on ten measurements of the rate. This certified value is considered valid within the limits shown for a period ofsix months from the date ofshipment from

the National Bureau of Standards.

The nitrogen dioxide permeation device was calibrated in the Gas and Particulate Science Division of the Center for

Analytical Chemistry.

The overall direction and coordination of the technical effort leading to certification were performed under the

chairmanship of E. E. Hughes and H. L. Rook.

The technical and support aspects involved in the certification and issuance of this Standard Reference Material were

coordinated through the Office of Standard Reference Materials by R. W. Seward.

Washington, D.C. 20234 George A. Uriano, Chief

April 24, 1981 Office of Standard Reference Materials

Serial Number Calibrated by Date

The certified permeation rate in micrograms of nitrogen dioxide per minute at 25 °C is:

(over)

231
USE

This device can be used to produce mixtures ofnitrogen dioxide in air or other gas by placing the device in a stream ofthe

dry gas flowing at a known rate and at a known constant temperature. The accuracy of the concentration produced is dependent not only on the accuracy with which the device is calibrated, but, as importantly, on the accuracy with which

the purity of the gas, the rate of flow, and the temperature are known. Systems for generating known concentrations of

nitrogen dioxide with the device are describe elsewhere (1,2).

When the device is first placed in service, a period of at least 24 hours should be allowed for equilibration at the temperature at which it is to be used.

It is recommended that the device be used at the calibration temperature of 25.0 °C, but if the temperature does not vary

more than 5 °C from 25 °C, an adjustment to the rate may be made according to the equation:

log Rt = log R25 + 0.034512 (t-25.0)

where Rt is the permeation rate of the device at the temperature of use, t, and R25 is the certified rate of the device at 25.0 °C. The constant, 0.034512, is empirically determined using observations of the temperature-rate relationships for

identical devices at temperatures between 20 and 30 °C. The additional uncertainty in the calculated value for the rate at temperatures of 1 °C above or below 25.0 °C is approximately ±0.4 percent; and 5 °C above or below 25.0 °C, the

added uncertainty is ±2 percent of the certified rate.

Precautions and Storage

The rate of permeation of nitrogen dioxide from this device may be adversely affected by exposure to temperatures

greater than 35 °C and by exposure to moist air. It is recommended that the device be stored between periods ofuse in a

container maintained at about 25 °C and through which a slow flow of dry air (<5 percent relative humidity) is passed.

Upon receipt of the device it should be removed from the protective plastic sleeve and placed in the above described

storage container. At no time should the device be exposed to moist air other than for the brief period necessary for

transfer from one container to another. Low temperature storage of the device is not recommended.

The device consists essentially of a stainless steel reservoir and a short Teflon permeation tube. The device contains less than one gram of liquid nitrogen dioxide at a pressure of one atmosphere (lOOkPa).

Calibration

This device was individually calibrated by gravimetric determination of the weight loss at 25 °C. The device was held at

this temperature for a period of not less than three months during which time periodic measurements of weight were

made.

The accuracy of calibration was estimated from measurements of approximately 50 devices in this lot. The uncertainties are the approximate half-width of the 95-percent confidence interval. It is believed that the systematic error concerned

with these calibrations is negligible.

References

(1) Health Laboratory Science, No. 1, 4 (1970)

(2) F. P. Scarringelli, A. E. O'Keeffe, E. Rosenhart and J. P. Bell, Anal. Chem. 42, 871 (1970)

232
U. S. Department of Commerce

Malcolm fialdrige

'Secretary?'

National f)ur«n« of$iandards

Ernest ^mblpr. Director

Rational ££u«au of jltantlartte

Certificate of Calibration

Standard Reference Material 1911

Benzene Permeation Device

This Standard Reference Material consists of a benzene permeation device, individually calibrated, for use in the

preparation of gases of known benzene content. SRM 1911 is intended for the standardization of air pollution and

related chemical analyses.

Serial Number Calibrated by: Date:

The certified permeation rate in micrograms of benzene per minute at 25.0 °C is:

The uncertainty given for this value is the 95 percent confidence limit of the mean of 20 measurements of the rate. The

certified value is considered valid within the limits shown for a period of one year from the date of shipment from the

National Bureau of Standards.

The benzene permeation device was calibrated in the Gas and Particulate Science Division of the Center for Analytical

Chemistry.

The overall direction and coordination of the technical effort leading to the certification of this Standard Reference

Material were performed under the chairmanship of W.P. Schmidt and H.L. Rook.

The technical and support aspects involved in the certification and issuance of this SRM were coordinated through the

Office of Standard Reference Materials by R.W. Seward.

Washington, D.C. 20234 George A. Uriano, Chief

August 4, 1982 Office of Standard Reference Materials

(over)

233
USE:

This device can be used to produce known concentrations of benzene in air or another gas by placing the device in a stream of the pure, dry air /gas flowing at a known rate and at a known constant temperature. The accuracy of the

concentration produced depends not only on the accuracy of the certified permeation rate, but also on the accuracy with

which the purity of the gas, the rate of flow, and the temperature are known. Systems for generating known concentrations using permeation devices are described in ASTM D-2914.

When the device is first placed in service, a period of at least 24 hours should be allowed for equilibration at the

temperature at which it is to be used. NOTE: See "Precautions and Storage" below. It is recommended that the device be

used at the calibration temperature of 25.0 °C, but if the temperature does not vary more than 5 °C FROM 25 °C, an

adjustment to the rate may be made according to the equation:

Log RT = Log R25 + 0.0359(T-25.0)

Where Rr is the permeation rate of the device at the temperature of use, T, and R25 is the certified rate of the device at 25.0 °C. The constant, 0.0359, was empirically determined using observations of the temperature-rate relationships for

i dentical devices at temperatures between 25 and 40 0 C. The additional uncertainty in the calculated value for the rate

at temperatures of 1 °C above or below 25.0 °C is approximately ± 1.0 percent; and between 1 °C and 5 °C above or below 25.0 °C, the added uncertainty is ±5 percent of the certified rate.

PRECAUTIONS and STORAGE:

The polymers of which this tube is constructed will absorb organic compounds (including benzene) if exposed to high

concentrations of these compounds during storage. Subsequent desorption of these compounds during use may result in a concentration different from that predicted by the certified rate. It is therefore essential that upon receipt this device be

removed from the shipping container and stored in a chamber through which a slow flow of air/gas is continuously

passed. Low temperature storage of the device is not recommended. The exposure of the device to temperatures greater

than 35 °C may permanently change the permeation rate from the certified value.

CALIBRATION:

This device was individually calibrated by gravimetric determination of the weight loss at 25.0 °C. The device was held at

this temperature for a period of not less than three months during which time measurements of weight were made. In

addition, each device was compared with primary gas standards using flame ionization detection (FID) to determine

any systematic error associated with the gravimetric calibration.

234
% • 4 U. S. Departiti^m^bf Commerce

Malcolm fialdrige Secretary7

Manorial Bureau of Standards

Erncsl Ambler. Direclor Rational ^Bureau of j^tandartte

Certificate of Calibration

Standard Reference Material 1912

Tetrachloroethylene Permeation Device

This Standard Reference Material (SRM) is a tetrachloroethylene permeation device, individually calibrated.

SRM 1912 is intended for use in the standardization of apparatus and procedures used in air pollution and related

chemical analyses and for the preparation of gas mixtures of known tetrachloroethylene content.

The certified permeation rate in micrograms of tetrachloroethylene per minute at 25.0 °C is

Serial Number Date of Calibration

The uncertainty of the certified permeation rate is two standard deviations of the mean of ten measurements of the

permeation rate over a 12 month period. The certified value is valid within these limits for a period of one year from

the date of shipment from the National Bureau of Standards.

Note: The certified value of this permeation device is valid only if the use and recommended storage conditions given on

page 2 are followed.

The tetrachloroethylene permeation device was calibrated in the Gas and Particulate Science Division, Center for

Analytical Chemistry by CD. Mitchell. The overall direction and coordination of the technical effort leading to the

certification of this Standard Reference Material were performed under the chairmanship of W.L. Zielinski and

H.L. Rook.

The technical and support aspects involved in the certification and issuance of this SRM were coordinated through the

Office of Standard Reference Materials by R. W. Seward.

Gaithersburg, MD 20899 Stanley D. Rasberry, Chief

September 9, 1985 Office of Standard Reference Materials

(Over)

235
Notice and Warnings to Users:

Tetrachloroethylene has been defined by NIOSH as a possible carcinogen, therefore this SRM should be treated as a

potential health hazard. Techniques used in handling radioactive and infectious materials are applicable to this SRM.

Users in the United States should contact their Regional Office of the U.S. Environmental Protection Agency for

information regarding proper disposal of these materials; in other countries, they should contact the appropriate

organization responsible for public health or environmental control.

USE:

This device can be used to produce known concentrations of tetrachloroethylene in air or another gas by placing the

device in a stream of the pure, dry air/gas (e.g., nitrogen) flowing at a known rate and at a known constant temperature.

The accuracy of the concentration produced depends not only on the accuracy of the certified permeation rate, but also

on the accuracy with which the purity of the air/gas, the rate of flow, and the temperature are known. Systems for

generating known concentrations using permeation devices are described in ASTM D-2914.

When the device is first placed in service, a period of at least four weeks should be allowed for equilibration at the

temperature at which it is to be used. Note: See "Storage" below. The device should be used at the calibration temperature of 25.0 °C; however, if the temperature used does not exceed more than 5 °C above or below 25 °C, an adjustment

to the rate may be made according to the equation:

Log Rt = Log R25 + 0.0355 (t - 25.0)

where Rt is the permeation rate of the device at temperature, t(°C), and R25 is the certified permeation rate of the device

at 25.0 °C. The constant, 0.0355, was empirically determined using observations of the temperature-rate relationships

for identical devices at temperatures between 20 and 30 °C. The additional uncertainty in the calculated value for the

permeation rate at temperatures up to 5 °C above or below 25.0 °C is approximately ±5.0 percent of the certified

permeation rate.

STORAGE:

The polymers from which this device is constructed will absorb organic compounds (including tetrachloroethylene) if exposed to high concentrations of these compounds during storage. Subsequent desorption of these compounds during

use may result in a concentration different from that predicted by the certified rate. Therefore, upon receipt, this device

must be removed from the shipping container and immediately stored in a chamber through which a flow of at least 100

mL/min of dry air/gas is continuously passed. Low temperature storage of the device is not recommended. Prolonged

exposure of the device to temperatures greater than 30 °C or below 20 °C may permanently change the certified rate.

CALIBRATION:

This device was individually calibrated by gravimetric determination of its weight loss at 25.0 °C. The device was held

at this temperature for a period of not less than one year during which time measurements of weight were made.

Analytical comparisons of several devices of this SRM batch to primary gas standards and SRM's of tetrachloroethylene

in nitorgen in compressed gas cylinders using gas chromatography with flame ionization detection did not reveal any

systematic errors associated with the gravimetric calibration of this device.

236
ACKNOWLEDGEMENT

The authors gratefully acknowledge the contributions of Ms. LaDonna Hess

who prepared this manuscript for publication.

237
NBS-114A (rev. 2.eo)

3. Publication Date

May 1987

U.S. DEPT. OF COMM.

BIBLIOGRAPHIC DATA

SHEET (See instructions)

PUBLICATION OR

REPORT NO.

NBS/SP-260/108

2. Performing Organ. Report No,

4. title and subtitle Standard Reference Materials:

Summary of Gas Cylinder and Permeation Tube Standard Reference Materials

Issued by the National Bureau of Standards

5. AUTHOR(S)

R. Mavrodineanu and T.E. Gills

6. PERFORMING ORGANIZATION (If joint or other than NBS. see instructions)

NATIONAL BUREAU OF STANDARDS

U.S. DEPARTMENT OF COMMERCE

GAITHERSBURG, MD 20899

7. Contract/Grant No.

S. Type of Report & Period Covered

Final

9. SPONSORING ORGANIZATION NAME AND COMPLETE ADDRESS (Street. City. State, ZIP)

Center for Analytical Chemistry Office of Standard Reference Materials

National Measurement Laboratory National Measurement Laboratory

National Bureau of Standards National Bureau of Standards

Gaithersburg, MD 20899 Gaithersburg, MD 20899

10. SUPPLEMENTARY NOTES

Library of Congress Catalog Card Number: 87-61981

7

I | Document describes a computer program; SF-185, FIPS Software Summary, is attached.

11. ABSTRACT (A 200-word or less factual summary of most significant information. If document includes a significant

bibliography or literature survey, mention it here)

This publication is a summary of the gas cylinders and permeation tubes

issued by NBS as Standard Reference Materials (SRM's). The material,

composition, certification, use, and remarks concerning each of the SRM's

described are presented in tabular form. Copies of the certificates of

these SRM's are contained in the appendices for more detailed

information

.

12. KEY WORDS (Six to twelve entries; alphabetical order; capitalize only proper names; and separate key words by semicolons)

air; benzene; carbon dioxide; carbon monoxide; gas; methane; nitric oxide; nitrogen;

nitrogen dioxide; nitrous oxide; oxygen; permeation tubes; propane; Standard

Reference Materials; sulfur dioxide

13. AVAILABILITY

rXI Unlimited

| | For Official Distribution. Do Not Release to NTIS

nn Order From Superintendent of Documents, U.S. Government Printing Office, Washington, D.C.

20402.

| | Order From National Technical Information Service (NTIS), Springfield, VA. 22161

14. NO. OF

PRINTED PAGES

234

15. Price

ftU. S. GOVERNMENT PRINTING OF

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FICE:19B7- 1 81 -076 1 6008

1
Technical Publications

Periodical

Journal of Research—The Journal of Research of the National Bureau of Standards reports NBS research

and development in those disciplines of the physical and engineering sciences in which the Bureau is active.

These include physics, chemistry, engineering, mathematics, and computer sciences. Papers cover a broad

range of subjects, with major emphasis on measurement methodology and the basic technology underlying

standardization. Also included from time to time are survey articles on topics closely related to the Bureau's

technical and scientific programs. Issued six times a year.

Nonperiodicals

Monographs—Major contributions to the technical literature on various subjects related to the Bureau's scientific and technical activities. Handbooks—Recommended codes of engineering and industrial practice (including safety codes) developed in cooperation with interested industries, professional organizations, and regulatory bodies.

Special Publications—Include proceedings of conferences sponsored by NBS, NBS annual reports, and other

special publications appropriate to this grouping such as wall charts, pocket cards, and bibliographies.

Applied Mathematics Series—Mathematical tables, manuals, and studies of special interest to physicists,

engineers, chemists, biologists, mathematicians, computer programmers, and others engaged in scientific and

technical work.

National Standard Reference Data Series—Provides quantitative data on the physical and chemical properties

of materials, compiled from the world's literature and critically evaluated. Developed under a worldwide program coordinated by NBS under the authority of the National Standard Data Act (Public Law 90-3%).

NOTE: The Journal of Physical and Chemical Reference Data (JPGRD) is published quarterly for NBS by

the American Chemical Society (ACS) and the American Institute of Physics (AIP). Subscriptions, reprints,

and supplements are available from ACS, 1155 Sixteenth St., NW, Washington, DC 20056.

Building Science Series—Disseminates technical information developed at the Bureau on building materials,

components, systems, and whole structures. The series presents research results, test methods, and perfor- mance criteria related to the structural and environmental functions and the durability and safety

characteristics of building elements and systems.

Technical Notes—Studies or reports which are complete in themselves but restrictive in their treatment of a

subject. Analogous to monographs but not so comprehensive in scope or definitive in treatment of the subject

area. Often serve as a vehicle for final reports of work performed at NBS under the sponsorship of other

government agencies.

Voluntary Product Standards—Developed under procedures published by the Department of Commerce in Part 10, Title 15, of the Code of Federal Regulations. The standards establish nationally recognized re- quirements for products, and provide all concerned interests with a basis for common understanding of the

characteristics of the products. NBS administers this program as a supplement to the activities of the private

sector standardizing organizations.

Consumer Information Series—Practical information, based on NBS research and experience, covering areas of interest to the consumer. Easily understandable language and illustrations provide useful background

knowledge for shopping in today's technological marketplace.

Order the above NBS publications from: Superintendent of Documents, Government Printing Office,

Washington, DC 20402.

Order the following NBS publications—FIPS and NBSIR 's—from the National Technical Information Service, Springfield, VA 22161.

Federal Information Processing Standards Publications (FIPS PUB)—Publications in this series collectively

constitute the Federal Information Processing Standards Register. The Register serves as the official source of

information in the Federal Government regarding standards issued by NBS pursuant to the Federal Property

and Administrative Services Act of 1949 as amended, Public Law 89-306 (79 Stat. 1127), and as implemented

by Executive Order 1 1717 (38 FR 12315, dated May 11, 1973) and Part 6 of Title 15 CFR (Code of Federal

Regulations).

NBS Interagency Reports (NBSIR)—A special series of interim or final reports on work performed by NBS

for outside sponsors (both government and non-government). In general, initial distribution is handled by the

sponsor; public distribution is by the National Technical Information Service, Springfield, VA 22161, in paper

copy or microfiche form.
U.S. Department of Commerce

National Bureau of Standards

Gaithersburg, MD 20899

Official Business

Penalty for Private Use $300