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Issue 11, 2009
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Application of a nanoporous gold electrode for the sensitive detection of copperviamercury-free anodic stripping voltammetry

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Abstract

This paper describes how a new mercury-free alternative electrode material, nanoporous gold (NPG), was applied to improve the performance of detecting trace metals in stripping voltammetry. The NPG electrode was obtained by dealloying Zn from AuxZn1−x in a 40–60 mol% zinc chloride1-ethyl-3-methylimidazolium chloride (ZnCl2–EMIC) ionic liquid. To prevent electrode fouling from surfactant adsorption, the short carbon-chain organothiol (3-mercaptopropyl)sulfonate (MPS) was selected to modify the NPG electrode through the formation of a self-assembled monolayer (SAM). The MPS-modified NPG (MPS@NPG) electrode not only significantly enhanced the sensitivity in detecting Cu2+ but also effectively prevented electrode surface fouling from surfactant adsorption. The electrode is easy to prepare and can be readily renewed after each stripping experiment. The dynamic range of calibration curve, y = 58.76x (in µA µM−1) + 3.90 (R2 = 0.999), showed very linear behavior with slope of 58.76 µA µM−1 (0.1–5 µg L−1). The detection limit is as low as 0.002 µg L−1 (0.031 nM). Non-ionic, anionic, and cationic surfactants were found to have no effect on Cu2+ detection when using the MPS@NPG electrode as a sensing probe. This method was applied to determining the Cu2+ in a reference material and three real water samples. The results agreed satisfactorily with the certified values.

Graphical abstract: Application of a nanoporous gold electrode for the sensitive detection of copperviamercury-free anodic stripping voltammetry

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Publication details

The article was received on 26 May 2009, accepted on 25 Aug 2009 and first published on 15 Sep 2009


Article type: Paper
DOI: 10.1039/B910282E
Citation: Analyst, 2009,134, 2306-2313
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    Application of a nanoporous gold electrode for the sensitive detection of copperviamercury-free anodic stripping voltammetry

    J. Huang and B. Lin, Analyst, 2009, 134, 2306
    DOI: 10.1039/B910282E

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