Determination of chromium(VI) by anodic stripping voltammetry using a silver-plated glassy carbon electrode

Determination of chromium(VI) by anodic stripping voltammetry using a silver-plated glassy carbon electrode

Článek WoS

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 CH3COOH/NH3 (aq) medium at pH 5.9 was linear over the wide concentration range of 0.35-40 M Cr(vi). The present method shows a low limit of detection of 0.10 mu M. 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).

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 CH3COOH/NH3 (aq) medium at pH 5.9 was linear over the wide concentration range of 0.35-40 M Cr(vi). The present method shows a low limit of detection of 0.10 mu M. 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).

Differential pulse anodic stripping voltammetry (DP-ASV); hexavalent chromium (Cr(VI)); glassy carbon electrode

Differential pulse anodic stripping voltammetry (DP-ASV); hexavalent chromium (Cr(VI)); glassy carbon electrode

STOJANOVIC, Z.; KOUDELKOVÁ, Z.; SEDLÁČKOVÁ, E.; HYNEK, D.; RICHTERA, L.; ADAM, V.

2019

28.06.2018

1759-9660

Analytical Methods

10

24

Spojené království Velké Británie a Severního Irska

2917

2923

7

Determination of chromium(VI) by anodic stripping voltammetry using a silver-plated glassy carbon electrode