More particularly, it relates to a procedure and materials for {HEAD ~ the preconcentration} of {TAIL ~ analytes} in order to facilitate the analytic process 
of
More particularly , it relates to a procedure and materials for { HEAD ~ the preconcentration } of { TAIL ~ analytes } in order to facilitate the analytic process
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH