A diffusive sampler comprises a housing with {HEAD ~ 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 {TAIL ~ the sorbent} 
A diffusive sampler comprises a housing with { HEAD ~ 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 { TAIL ~ the sorbent }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL