Determination of Trace Chromium by Square-Wave Adsorptive Cathodic Stripping Voltammetry at an Improved Bismuth Film Electrode

A square-wave adsorptive cathodic stripping voltammetric protocol coupled with an improved bismuth film electrode (BiFE) for the determination of trace chromium in the presence of 4-(2-pyridylazo) redorcinol (PAR) has been investigated. A well-defined and sensitive stripping peak of the Cr(III)-PAR co...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2013-01, Vol.160 (4), p.H237-H242
Main Authors: Zhang, Qing, Zhong, Shang-wei, Su, Jia-li, Li, Xiang-jun, Zou, Hong
Format: Article
Language:English
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Summary:A square-wave adsorptive cathodic stripping voltammetric protocol coupled with an improved bismuth film electrode (BiFE) for the determination of trace chromium in the presence of 4-(2-pyridylazo) redorcinol (PAR) has been investigated. A well-defined and sensitive stripping peak of the Cr(III)-PAR complex was observed at −0.57 V (versus SCE) in a 0.1 mol/L acetate buffer solution (pH 5.0) at a deposition potential of −0.45 V. The experimental variables as well as potential interferences were studied. Compared with the BiFE plated in the solution prepared based on HAc-NaAc without trisodium citrate, the improved BiFE electrodeposited in the solution of HAc-NaAc prepared based on containing trisodium citrate displayed a better electroanalytical performance for the determination of chromium(III). Under the optimized conditions, the limit of detection for chromium was 2.0 × 10−10 mol/L and the relative standard deviation was 4.35% at the 1.0 × 10−8 mol/L level (n = 7). This method was applied to determine the trace amount of chromium in several environmental samples.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.011306jes