N. Masque et al., Influence of chemical modification of polymeric resin on retention of polar compounds in solid-phase extraction, CHROMATOGR, 50(1-2), 1999, pp. 21-26
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.