International comparison CCQM-K82: methane in air at ambient level (1800 to 2200) nmol/mol

Abstract

The CCQM-K82 comparison was designed to evaluate the degrees of equivalence of NMI capabilities for methane in air primary reference mixtures in the range (1800 to 2200) nmol/mol. The balance gas for the standards was either scrubbed dry real air or synthetic air.