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