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Anodic Stripping Voltammetry for the Determination of Trace Cr(VI) with Graphite/Styrene-Acrylonitrile Copolymer Composite Electrodes

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Abstract

A square-wave anodic stripping voltammetry (SWASV) for the determination of trace amounts of hexavalent chromium Cr(VI) at a graphite/styrene-acrylonitrile (Graphite-SAN) copolymer composite electrode is described. This method involves a preconcentration step whereby the trace Cr(VI) was cathodically reduced to Cr(III) on an electrode surface in an acetate buffer (pH 5), followed by an anodic stripping technique with a square-wave voltammetric mode. It has been shown that the analytical sensitivity is significantly improved at the Graphite-SAN copolymer composite electrode in comparison with the conventional glassy carbon electrode, due to the strong interaction between Cr(III) and the nitrile end group of the SAN copolymer. The SWASV response was characterized with respect to the pH, deposition potential, possible interferences, etc. Under the optimal conditions, the stripping peak height linearly increased with the concentration of Cr(VI) in a range from 0 to 150 ng mL–1 with a correlation coefficient of 0.997, and a detection limit of 4.2 ng mL–1 was achieved based on signal-to-noise ratio of about 3. The Graphite-SAN composite electrode exhibited some interesting advantages, such as high mechanical rigid, easy surface renewable, higher sensitivity and better peak resolution in comparison with the results at conventional glassy carbon electrodes. They have been applied to the determination of Cr(VI) in real water samples with satisfactory recoveries.

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Acknowledgments

This work was supported by JSPS KAKENHI Grant No. 16K05813.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan

    Trisna K. Sari & Jiye Jin

  2. Department of Chemistry, Faculty of Mathematics and Natural Science, Andalas University, Padang, 25163, Indonesia

    Rahmiana Zein & Edison Munaf

Authors
  1. Trisna K. Sari
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  2. Jiye Jin
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  3. Rahmiana Zein
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  4. Edison Munaf
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Correspondence to Jiye Jin.

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Sari, T.K., Jin, J., Zein, R. et al. Anodic Stripping Voltammetry for the Determination of Trace Cr(VI) with Graphite/Styrene-Acrylonitrile Copolymer Composite Electrodes. ANAL. SCI. 33, 801–806 (2017). https://doi.org/10.2116/analsci.33.801

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  • DOI: https://doi.org/10.2116/analsci.33.801

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