Passive air sampler
Passive air samplers are passive sampling devices used to collect chemicals in ambient air. Passive air samplers allow gaseous chemicals to accumulate onto sampling media over a period of time to derive time-integrated chemicals concentrations in air. Passive air samplers do not require electricity and can be used for air monitoring at remote locations.
Passive air samplers are based on molecular diffusion and sorption of chemicals to various sorbents as passive sampling media (PSM). When a passive air sampler is deployed, chemicals with higher fugacities in the air diffuse to the PSM until equilibrium is reached (i.e. the fugacity in the PSM equals that in the ambient air). In order to derive concentrations of chemicals in ambient air, two approaches can be applied. The first is the equilibrium approach, which derives the air concentrations based on the amounts (concentrations) of chemicals accumulated in the PSM at equilibrium and the equilibrium partition coefficients between PSM and air. The second approach to determine ambient air concentrations from the amount of chemicals sorbed to the PSM is based on the uptake kinetics and is normally adopted in passive air sampling for semi-volatile organic chemicals.
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passive air sampler[edit]
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