{HEAD ~ The diffusive sampler} 9, wherein {TAIL ~ said sorbent} is made of activated carbon 
wherein
{ HEAD ~ The diffusive sampler } 9 , wherein { TAIL ~ said sorbent } is made of activated carbon
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH