Influence of chemical modification of polymeric resin on retention of polar compounds in solid-phase extraction

Three polymeric adsorbents, two of which had been chemically modified with different hydrophilic functional moieties and the third, which was the corr esponding unmodified polystyrene-divinylbenzene (PS-DVB) resin, were compar ed for solid-phase extraction (SPE) of several polar pesticides and phenoli c compounds from water samples. The SPE system was online coupled to a liqu id chromatograph with UV detector. Chemical modification of the PS-DVB resin wit either 2-carboxy-3/4-nitroben zoyl or 2,4-dicarboxybenzoyl, improved the efficiency of the SPE process by increasing polar interactions with the analytes. the adsorbent with the ni tro group gave higher recoveries, mainly for the most polar analytes. This adsorbent enabled 100 mL river water to be preconcentrated to determine the target analytes in this matrix.