SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT APPLIED SCIENCE

& TECHNOLOGY DIVISION LABORATORY SERVICES BRANCH SCAQMD METHOD 316A-92 DETERMINATION

OF VOLATILE ORGANIC COMPOUNDS (VOC)
IN MATERIALS USED FOR PIPES AND FITTINGS Approved September

9, 1992 Revised June 1993 Revised December 1995 Revised October 1996Revised October 1996 SCAQMD METHOD 316A-92 DETERMINATION

OF VOLATILE ORGANIC COMPOUNDS (VOC)
IN MATERIALS USED FOR PIPES AND FITTINGS This method

is used
to determine

the volatile organic compounds (VOC)

in materials used for pipes and fittings. The method

is applicable

to materials regulated

as reactive diluents under rules
in Regulation

XI. CONTENTS 1. Principle 2. Equipment

1 3. Reagents and Materials

1 4. Analytical Procedure

2 4.1 Determination

of VOC

2 4.2 Preparation

of the pipe-joint assembly

2 4.3 Determination

of VOC retained as part of the finished product

2 4.4 Determination

of VOC emitted
by blank pipe

3 5. Calculations

4 6. Precision (For samples that do not contain water
or exempt compounds)

5RevisedOctober1996SCAQMDMETHOD316A-92DETERMINATIONOFVOLATILEORGANICCOMPOUNDS(VOC)INMATERIALSUSEDFORPIPESANDFITTINGSPrincipleAnaliquotofthematerialisanalyzedforVOCbytheprocedurespecifiedinSCAQMDMethod304.AnotherportionofthematerialisappliedtoasubstratespecifiedbythemanufacturerandcuredinaccordancewithSection4.3.8.Aftercuring,theassemblyisheatedforonehourat110°C.TheVOCretainedandtheVOCemittedisthendetermined.TheVOCvalueforcompliancetoSCAQMDregulationsisdependentupontheamountofVOCretainedonthesubstrate.2.Equipment2.1Laboratoryexhausthood2.2Balance,analytical,capableofweighingaccuratelyto0.1mg2.3Pipecutter,hacksaw,capableofcuttingpipesofdiameterof2.5inchesorless2.4Otherequipment:refertorelevantindividualmethodsinSCAQMDMethod304manualforotherequipmentneeded.2.5Oven,forceddraft,capableofmaintainingthetemperatureat110°Cforatleastonehour.RefertoASTMD2369forspecifications.3.ReagentsandMaterials3.1Substratesforcurrentlyidentifiedapplications:1/2”diameterPVC,Schedule402”diameterABS,Schedule403/4”diameterCPVC,Schedule803.2Straightconnectors,slip/slip,ofthesamematerialasthetestpipe.Innerdiameterofthestraightconnectortobethesameasouterdiameterofthetestpipe.—1—DeterminationofVolatileOrganicCompounds(VOC)inMaterialsUsedforPipesandFittingsRevisedOctober1996 3.3 Other reagents and materials

as needed

in the relevant individual method

in SCAQMD Method 304 3.4 Container,

1/4 pint with an applicator swab 4. Analytical Procedure 4.1 Determination

of VOC 4.1.1 The VOC content
of the uncured material

is determined using SCAQMD Method 304-91. This VOC expressed

in percent
by weight

is VOC

as determined

in SCAQMD Method 304-91, Section 5.3. 4.2 Preparation

of the pipe-joint assembly 4.2.1 Cut two

3 1/2 inch pieces of the appropriate pipe. 4.2.2 Clean joint and pipes with paper towel
or kimwipes until they are free of dust and any other extraneous material. 4.2.3 Weigh the pipe-joint assembly

to the nearest
0.1 mg (Wai). 4.3 Determination

of VOC retained

as part of the finished product 4.3.1 Material must be in a 1/4 pint container with an applicator swab. 4.3.2 Wipe clean the material container

to remove dust and weigh

to the nearest
0.1 mg (W). 4.3.3 Steps 4.3.4 through 4.3.6 must be completed

in 2 minutes. 4.3.4 Open the tared material container taking care not to spill any material. Carefully apply without spilling,

a smooth uniform coating around the outside edges of both PVC pipes. Similarly apply material

to the inside walls of the joint. 4.3.5 Immediately return the applicator brush
to the can and close the lid tight. 4.3.6 Complete
the assembly

by pushing the coated ends of the pipes into the joint.

-2-DeterminationofVolatileOrganicCompounds(VOC)inMaterialsUsedforPipesandFittingsRevisedOctober1996 4.3.7 Immediately after application weigh the material container

to the nearest 0.1 mg (Wsf). 4.3.8 Allow the CPVC

or PVC assembly

to dry for 24 hours

at 70° to 85°F under the hood. For the ABS assembly, allow
to dry for 48 hours

at 70° to 85°F under the hood. 4.3.9 Heat the assembly

in the oven
at 110°C for

1 hour. 4.3.10 Cool
to room temperature

in a desiccator. 4.3.11 Weigh the assembly

to the nearest 0.1 mg (Waf). 4.3.12 Repeat steps 4.2 to 4.3.11 six times. 4.3.13 Proceed

to Section

5 for calculations. 4.4. Determination

of VOC emitted
by blank pipe (Note: run concurrently with sample analysis) 4.4.1 Prepare

a pipe-joint assembly

as in Section 4.2. 4.4.2 Complete
the assembly

by pushing the pipes into the joint. 4.4.3 Weigh the pipe-joint assembly

to the nearest
0.1 mg (Wbi) 4.4.4 Follow Sections 4.3.8
to 4.3.10. 4.4.5 Weigh the assembly

to the nearest
0.1 mg (Wbf). 4.4.6 Repeat steps 4.4.1
to 4.4.5 two times. 4.4.7 Calculate

the grams
of VOC emitted

by the pipe assembly, Wb, according

to Section 5.1. -3-Determination

of Volatile Organic Compounds (VOC)

in Materials Used for Pipes and Fittings

Revised October 1996



# C 5. Calculations 5.1 Weight loss of each blank pipe, Wb, in grams/g
of pipe: (Wbj- Wbf)Wb=___________ Wbj 5.2 Correction value of weight loss due to pipe assembly,W,

in grams: Waj W=

X
E (Wb)n 3
n=1 5.3 The weight percent total volatiles (TV) emitted for each run: [(W)- (Waf Waj)- Wj X 100 TV=



# c 5.4 The weight percent water and exempt compounds (Exem)

in the total volatiles emitted,

if applicable: Exem= (EX

x TV)/100 5.5 The actual weight percent VOC emitted (VOCae)

is: VOCae
TV- Exem 5.6 The weight percent
of VOC retained

as integral part of the assembly (VOCr)
for each run: (VOC 5- VOCae)

X 100VOCr=______________ VOC 5

-4-DeterminationofVolatileOrganicCompounds(VOC)inMaterialsUsedforPipesandFittingsRevisedOctober1996 5.7 To convert VOCae

to total VOC g/L emitted: VOC VOCae

X Dm X10 Note: For equation 5.7, use the average
of seven runs from 5.5 for VOCae. 5.8 Definition

of terms: Wbj= Initial weight
of blank assembly,

g, (Section 4.4.3) Wbf= Final weight
of blank assembly,

g, (Section 4.4.5) W 5 Weight
of material used to coat assembly (W- Wsf),

g W 5= Initial weight
of material container,

g, (Section 4.3.2) Wsf= Weight
of material container after application,

g, (Section 4.3.7) Wai= Initial weight
of assembly,

g, (Section 4.2.3) Waf= Weight
of assembly after heating,

g, (Section 4.3.11) Dm= Density
of material

by SCAQMD Method 304-91, gImL VOC Weight percent VOC obtained

by SCAQMD Method 304-91 EX= Sum of the weight percent water and weight percent exempt compounds

in the material, determined

by SCAQMD Method 304-91. 5.9 Determination

of the VOC of the material
for compliance. 5.9.1

To determine compliance

to the requirement

of Rule 1168, the VOC value will be calculated

as specified

by the Rule. 6. Precision (For samples that do not contain water
or exempt compounds) 6.1 Repeatability (Single Analyst) 6.1.1 The estimated coefficient

of variation

of results (each the average
of seven replicate determinations), obtained

by the same analyst
on different days

is listed
in Table

1.
-5-Determination

of Volatile Organic Compounds (VOC)

in Materials Used for Pipes and Fittings

Revised October 1996



# C 6.1.2 The 95% limit for the difference between two such averages

is also listed in Table

1. 6.2 Reproducibility (Multilaboratory) 6.2.1 The estimated coefficient

of variation

of results (each the average
of seven replicate determinations), obtained

by analysts

in different laboratories

is listed
in Table

2. 6.2.2 The 95% limit for the difference between two such averages

is also listed in Table

2.



# C,, -6-DeterminationofVolatileOrganicCompounds(VOC)inMaterialsUsedforPipesandFittingsRevisedOctober1996TableIRepeatabilty,(SingleAnalyst)CementEstimatedCoefficientDegreesof95%limitforTypeofVariation,%Freedomdifference,relative%relativeABS2.3145.0CPVC2.7145.8PVC3.4137.3Table2Reproducibility(Multilaboratory)CementtypeEstimatedCoefficientDegreesof95%limitforofVariation,%Freedomdifference,relative%relativeABS11.1529CPVC9.4524PVC6.8517-7-

# n