The Environment Protection Agency (EPA) requires that specialty gas producers selling standards labeled as an EPA Protocol Gas to follow the latest requirements.
The requirements
Specialty gas producers cannot sell EPA Protocol Gases if they are not assayed with NIST-traceable analytical reference standards. Currently, in order to assay nitrogen dioxide (NO2) gas mixtures as EPA Protocol Gases, the use of PRMs from VSL is required. NIST has indicated they are in the process of developing an NO2 SRM, but there is no timeline in place for when this development will be completed.
In addition, the EPA requests your opinion and any information you may have on (1) the long-term stability of the NO2 gas mixtures in the Luxfer cylinders and in standard passivated aluminum cylinders and (2) what concentration may be the most stable, so that this information may be communicated to our monitoring agencies.
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