Abstract
An ion-interaction reversed-phase liquid chromatographic method has been developed for the determination of cadmium at low μg/l concentrations in environmental water samples. Cadmium and other matrix metals were separated through on-column complexation with 8-hydroxyquinoline sulphonate, using an octadecylsilica column and a mobile phase containing 15% acetonitrile, 10–13 m M tetrabutylammonium hydroxide, 5 m M 8-hydroxyquinoline 5-sulphonic acid and 10 m M acetic acid–acetate buffer (pH 4.8–5.4). Under the above conditions Cd(II) could be easily resolved from excess concentrations of matrix metals and could be detected at concentrations as low as 2 μg/l using fluorescence detection at 500 nm (based upon a 100-μl injection). The method showed a slightly curved detector response over the range of interest [up to 1 mg/l Cd(II)] and was successfully applied to the determination of trace Cd(II) in water samples containing large excesses of Mg(II) and Zn(II) and other matrix metals.
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