Low54.0 Pass FTIR GMIS 47.5 Pass FTIR GMIS 5.0 Pass FTIR GMIS Mid401 Pass FTIR GMIS 499 Pass FTIR GMIS 12 Pass FTIR GMIS High911 Pass FTIR GMIS 981 Pass FTIR GMIS 18 Fail Pass FTIR NTRM Low48.90 Fail Pass ChemNTRM 47.73 Pass NDIR NTRM 5.01 Pass NDIR NTRM Mid406.0Pass ChemNTRM 496.8 Pass NDIR NTRM 12.0 Pass NDIR NTRM High900.0 Fail Pass ChemNTRM 994.6 Pass NDIR NTRM 18.0 Pass NDIR NTRM Low51.4 Pass NDIR NTRM 50.4 Pass NDIR GMIS 5.0 Pass NDIR NTRM Mid388 Pass NDIR NTRM 500 Pass NDIR NTRM 12 Pass NDIR NTRM High845 Fail Pass NDIR NTRM 1000 Pass NDIR NTRM 18 Pass NDIR NTRM Low50.05 Fail Pass Chem GMIS 50.23 Pass NDIR NTRM 5.04 Pass NDIR NTRM Mid397.5Pass ChemNTRM 502.8 Pass NDIR NTRM 12.0 Pass NDIR NTRM High900.0Pass ChemNTRM 998.8 Pass NDIR NTRM 18.1 Pass NDIR NTRM Low49.8 Pass FTIR SRM 50.9 Pass FTIR SRM 5.0 Pass FTIR NTRM Mid407.8 Fail Pass FTIR SRM 500.4 Pass FTIR NTRM 12.0 Pass FTIR NTRM High900 Fail Pass FTIR SRM 1000 Pass FTIR NTRM 18 Pass FTIR NTRM Low50.4 Pass Chem GMIS 48.7 Pass NDIR GMIS 5.2 Pass NDIRNTRM/GMIS Mid396 Pass Chem GMIS 466 Pass NDIR GMIS 13 Pass NDIRNTRM/GMIS High904 Pass Chem GMIS 956 Pass NDIR GMIS 18 Pass NDIRNTRM/GMIS Low48.9 Fail Pass FTIR SRM 49.5 Pass FTIR SRM 5.2 Fail Pass FTIR SRM Mid410 Fail Pass FTIR SRM 504 Pass FTIR SRM 12 Pass FTIR SRM High904 Pass FTIR SRM 988 Pass FTIR SRM 18 Pass FTIR SRM Low50.0 Pass Chem GMIS 50.1 Pass NDIR GMIS 5.1 Pass NDIR GMIS Mid398 Pass Chem GMIS 501 Pass NDIR GMIS 12 Pass NDIR GMIS High888 Pass Chem GMIS 1004 Pass NDIR GMIS 18 Pass NDIR GMIS Low50.0 Pass Chem GMIS 49.3 Pass NDIR GMIS 5.1 Pass NDIR GMIS Mid403 Pass Chem GMIS 496 Pass NDIR GMIS 12 Pass NDIR GMIS High894 Pass Chem GMIS 1004 Pass NDIR GMIS 18 Pass NDIR GMIS Low46.2 Fail Pass FTIR GMIS 51.8 Fail Pass FTIR GMIS 4.9 Pass FTIR GMIS Mid398 Pass FTIR GMIS 500 Pass FTIR GMIS 12 Pass FTIR GMIS High930 Pass FTIR GMIS 991 Pass FTIR GMIS 18 Fail Pass FTIR GMIS Low51.2 Pass Chem GMIS 50.0 Pass UV GMIS 5.0 Pass NDIR GMIS Mid406 Pass NDIR GMIS 509 Pass NDIR GMIS 12 Pass NDIR GMIS High914 Pass NDIR GMIS 999 Pass NDIR GMIS 18 Pass NDIR GMIS Low50.0 Pass FTIR NTRM 50.4 Pass FTIR NTRM 5.0 Pass FTIR NTRM Mid402 Pass FTIR NTRM 503 Pass FTIR NTRM 12 Pass FTIR NTRM High911 Pass FTIR NTRM 1011 Pass FTIR NTRM 18 Pass FTIR NTRM Low50.8 Pass Chem GMIS 50.9 Pass UV GMIS 5.1 Pass GC GMIS Mid397 Pass Chem GMIS 504 Pass UV GMIS 12 Pass GC GMIS High886 Pass Chem GMIS 997 Pass UV GMIS 18 Pass GC GMIS Low50.1 Pass ChemNTRM 50.2 Pass NDIR NTRM 5.0 Pass NDIR GMIS Mid405 Pass FTIR NTRM 495 Pass NDIR GMIS 12 Pass NDIR NTRM High923 Pass FTIR NTRM 988 Pass NDIR GMIS 18 Pass NDIR NTRM Vendor Analytical TechniqueReference

Standard



### A gaseous component was said to fail only if all available analytical techniques used in the audit indicated a greater than a 2.0% difference from the cylinder tag value. Any accuracy assessment is an instantaneous snapshot of the process being measured. These results should not be regarded as a final statement concerning the accuracy of EPA Protocol Gases. They can be used as an indicator EPA presents this information without assigning a rating to the gas vendors, for example, who is the best, who is approved, or is not approved. of the current status of the accuracy of EPA Protocol Gases as a whole. However, individual results should not be taken as definitive indicators of the analytical capabilities of individual producers. Reference Standard Tag Value (ppm SO2) Gas Conc. Level Original

Tag ValueReanalyzed

ValueVendor

Analytical TechniqueReference

Standard Audit Result Audit Result Original Tag Value

Spectra Gases Inc. Messer MG Industries (Spec Air Specialty Gas) National Specialty Gases

Praxair

Scott Specialty Gases Vendor Analytical Technique Original Tag Value Reanalyzed Value Reanalyzed Value Tag Value (% CO2)

Airgas South Specialty Gases

BOC Gases

AGA / Linde Gas Group

Matheson Tri-Gas

Messer MG Industries

Scott-Marrin In. Air Liquide

Airgas Southwest Specialty Gases

Airgas NCN Specialty Gases NO Audit Result Tag Value (ppm NO) Gas Vendor SO2 

## EPA Protocol Gas Audit Results Tri-Blend NO/SO2/CO2 Gases - Certified According to EPA Traceability Protocol EPA Cylinder Gas Assays: April 2003 - February 2004

CO2