Abstract
A procedure for the determination of chromium by differential pulse adsorptive stripping voltammetry (DPAdSV), using ammonium pyrrolidine dithiocarbamate (APDC) as complexing agent, has been optimized. The new method allows the selective determination of Cr(VI) in the presence of Cr(III) at pH equal to or below 3. The selection of the experimental conditions was made using experimental design methodology, and it was under these conditions where the calibrations were made, using a robust regression method which allows the elimination of anomalous points. The detection limit obtained was 1.09×10−9 M. The procedure was successfully applied to the determination of Cr(VI) and total chromium in different water samples.
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