{HEAD ~ A diffusive sampler} comprises 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 {TAIL ~ diffusion}, and at least one sorbate carried by the sorbent 
{ HEAD ~ A diffusive sampler } comprises 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 { TAIL ~ diffusion } , and at least one sorbate carried by the sorbent
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