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