Use for fixed gases, methane and light hydrocarbon testing.
The sample is collected in a precleaned and evacuated SUMMA canister or in a Tedlar bag using a pump. Composite sample may be collected using time integrated sampling. Sample volume ranges from 1 to 20 liters. Ambient sampling will not be affected by humidity or rain.
The sample is analyzed by GC/TCD/FID. The combined GC/TCD will measure both fixed gases (such as oxygen, nitrogen, carbon monoxide and carbon dioxide) and methane. Light hydrocarbons, including C1-C7, are analyzed by GC/FID. Both fractions may be analyzed by direct injection of a small amount of the sample into the GC.
Canisters, Tedlar bags, GC/TCD/FID
Fixed Gases: 0.5%
Light Hydrocarbons (C1-C6): 1.0 ppmv
Small sample volume required. Analysis is fast.
Low detection limits can not be achieved from GC/TCD.
TO-14 modified, EPA 25, TO-3 modified
Ambient air surveys, landfill well gas surveys, manufacture emission gas surveys, indoor air, stack gas analysis.