Analyzed by transferring a measured volume of air from the canister or bag to a cryogenic trap and hence to the GC/MS analytical system (preferred for legal defensibility).
Canisters or bags plus one for QC, compensating critical orifice or small pump for integrated samples, flow controller/flow meter, pressure/vacuum gauge. Projects may also require onsite measurement of temperature, relative humidity, barometric pressure (absolute), wind direction and speed. Clients may also need heavy walled Teflon tubing, tees, connectors, etc.
Detection limits – 0.2 ppbv
Convenience, easy to ship, low detection limits, applicable to broad range of target compounds. Can run duplicates and/or MS/MSD with certified reference standard rather than client sample. Sampler does not need to estimates how much air to sample.
TO-14 & TO-15, separately or combined.