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