Abstract
An ion-interaction based chromatographic procedure was developed for the on-line preconcentration, separation and UV detection of benzene and naphthalene sulphonic derivatives having different charges. The retention behaviour of the species was studied on an octylsilica stationary phase, using cetyltrimethylammonium chloride (CTACl) as ion pair reagent and methanol as organic modifier in the presence of sodium chloride. The effect of CTACl, CH 3OH and NaCl concentrations was evaluated for the separation of neutral compounds (benzene and naphthalene), monosulphonic acids (benzenesulphonic, toluene-4-sulphonic and 1-naphthalenesulphonic acids), disulphonic acids (benzene-1,3-disulphonic and naphthalene-1,5-disulphonic acids) and naphthalene-1,3,6-trisulphonic acid. The preconcentration recoveries, after the optimization of CTACl concentration added to the sample, made it possible to reduce the detection limits from ppm to sub-ppb levels for some analytes.
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