Determination of chromium(vi) by anodic stripping voltammetry using a silver-plated glassy carbon electrode. Issue 24 (8th June 2018) - Stojanović, Zorica
Abstract : In this work, differential pulse anodic stripping voltammetry (DP-ASV) for the determination of trace amounts of hexavalent chromium (Cr(vi )) at a silver plated glassy carbon electrode (Ag plated-GCE) is described in detail. Abstract : In this work, differential pulse anodic stripping voltammetry (DP-ASV) for the determination of trace amounts of hexavalent chromium (Cr(vi )) at a silver plated glassy carbon electrode (Ag plated-GCE) is described in detail. A Ag film was prepared by in situ plating of silver on the glassy carbon electrode surface. Several solution conditions and instrumental parameters influencing the electroanalytical response of the Ag plated-GCE were examined and optimized for the determination of Cr(vi ). Under the optimized conditions, the calibration curve obtained in CH3 COOH/NH3 ( aq ) medium at pH 5.9 was linear over the wide concentration range of 0.35–40 μM Cr(vi ). The present method shows a low limit of detection of 0.10 μM. After evaluation of effects from possible interferences, the proposed method was successfully applied for the quantification of Cr(vi ) in real water samples, with satisfactory recovery (97–105%). This method is useful for the determination of chromium in drinking water and achieves sensitivity capable of detecting the limits set by the World Health Organization (WHO).