| Title: |
Passive (no purge) Samplers
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| Resource Type: |
web links
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| Producers or distributor |
US Environmental Protection Agency (US EPA)
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| Author / Producer Type: |
Agency, regulator or other governmental or inter-governmental body
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EUGRIS Keyword(s): |
Contaminated land-->Site investigation-->Methods
Contaminated land-->Site investigation-->Sampling and analysis
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| Short description: |
Passive sampling can be defined in the broadest sense as any method based on the free flow of contaminant molecules from the sampled media to a receiving phase in a sampling device. Depending upon the sampler, the receiving phase can be a solvent (e.g., water), chemical reagent, or porous adsorbent (e.g., activated carbon). While there are many different designs for passive samplers most have a barrier between the sampled medium and the receiving phase. The barrier determines the sampling rate that contaminants are collected at a given concentration and can be used to selectively permit or restrict various classes of chemicals from entering the receiving phase. There are three generic forms of passive (no purge) samplers: thief (grab) samplers, diffusion (equilibrium) samplers, and integrating (kinetic) samplers. All are deployed down a well to the desired depth within the screened interval or open borehole to obtain a discrete sample without using pumping or a purging technique
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Submitted By:
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Professor Paul Bardos WhoDoesWhat?
Last update: 03/07/2011
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