ABSTRACT
This chapter presents some examples of applications of sampling and pollutant collection methods to gaseous air pollutant measurements. A specified quantity of air is drawn through the impingers at an established flow rate. In many adsorber sampling applications, personal battery-powered, flow-controlled pumps are used. The complete sampling system, with a spare adsorption tube installed, must be calibrated, typically with a bubble meter. A type of adsorption tube that has value for screening an area to determine best placement of more precise sampling units is the colorimetric tube. The sampling system generally used is identical to that used for solvent desorption tubes. An interesting application of adsorption tube sampling for volatile organic compounds is the isolation flux chamber, used to measure emission rates of pollutants from landfill outgassing or hazardous waste disposal sites. Whole air samples can be collected by means of a displacement bottle, a bag inflation sampler, a sampling syringe, or an evacuated canister or flask system.
