COMPARISON OF SORBENTS FOR SOLID-PHASE EXTRACTION OF POLAR COMPOUNDS FROM WATER

Octadecyl-bonded silica, styrene-divinylbenzene and hydroxyethyl methacrylate-ethylene dimethacrylate sorbents were tested for their ability to preconcentrate aniline, benzothiazole, cyclohexanone and cyclohexanol. Breakthrough curves for these compounds were measured for aqueous solutions at pH 5.8 and 10.0 by gas chromatographic analysis of fractions of the aqueous effluents. Elution curves of the analytes in methanolic eluates were obtained in order to determine the optimum volume of the eluate. Using breakthrough volumes and widths of the elution curves, theoretical preconcentration factors were calculated for all analyte-aqueous sample-sorbent systems tested. Octadecyl-bonded silica and styrene-divinylbenzene sorbents were found to be suitable for the preconcentration of weakly polar to polar compounds for practical water quality control purposes. © 1990.