{HEAD ~ A diffusive sampler} comprises {TAIL ~ a housing} with an opening and containing a sorbent, preferably having a barrier between the sorbent and 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 
{ HEAD ~ A diffusive sampler } comprises { TAIL ~ a housing } with an opening and containing a sorbent , preferably having a barrier between the sorbent and 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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