A diffusive sampler comprises a housing with an opening and containing a sorbent, preferably having {HEAD ~ a barrier} between the sorbent and {TAIL ~ the opening} to prevent convection currents but still allowing the exchange of the analyte and the sorbate by diffusion, and at least one sorbate carried by the sorbent 
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A diffusive sampler comprises a housing with an opening and containing a sorbent , preferably having { HEAD ~ a barrier } between the sorbent and { TAIL ~ the opening } to prevent convection currents but still allowing the exchange of the analyte and the sorbate by diffusion , and at least one sorbate carried by the sorbent
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