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