scope:

Describes a procedure for sampling and determining concentrations of total non-methane volatile organic compounds (NMVOC) in the ambient atmosphere. Describes the collection of cumulative samples in passivated stainless steel canisters and subsequent laboratory analysis. It describes a procedure for sampling in canisters at final pressures above atmospheric pressure (referred to as pressurized sampling). It employs a cryogenic trapping procedure for concentration of the NMVOC prior to analysis. Describes the determination of the NMVOC by simple flame ionication detection (FID), without the gas chromatographic columns and complex procedures necessary for species separation. Is applicable to carbon concentrations in the range from 20 ppbC to 10000 ppbC. See 12.4 for procedures for lowering the range.