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Critical comparison of alternating current and differential pulse voltammetry in the determination of some heavy metals in sea-water

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Abstract

A critical comparison of phase-selective fundamental harmonic a.c. anodic stripping voltammetry and differential pulse anodic stripping voltammetry for the determination of Pb, Cd, Cu and Zn in sea-water is reported. Differential pulse anodic stripping voltammetry was found to be slightly more sensitive than the a.c. technique, but the effect of the charging current could be more effectively eliminated by the latter, especially in the determination of zinc(II) and copper(II). The detection limits for both techniques were found to be about 10−10-10−8 M for all four elements. The precision, expressed as relative standard deviation, was of the order of 2–5% for the fundamental harmonic a.c. method and 5–8% for differential pulse voltammetry. The accuracy (expressed as recovery) was 95–105% for the former and 90–110% for the latter.

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Authors and Affiliations

  1. Department of Chemistry, University of Ferrara, Via Luigi Borsari 46, I-44100, Ferrara, Italy

    Clinio Locatelli & Francesco Fagioli

  2. Hungarian Academy of Sciences, Research Laboratory for Inorganic Chemistry, Budaörsi ut. 45, H-1112, Budapest, Hungary

    Tibor Garai

Authors
  1. Clinio Locatelli
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  2. Tibor Garai
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  3. Francesco Fagioli
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Locatelli, C., Garai, T. & Fagioli, F. Critical comparison of alternating current and differential pulse voltammetry in the determination of some heavy metals in sea-water. Mikrochim Acta 107, 41–48 (1992). https://doi.org/10.1007/BF01772352

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  • DOI: https://doi.org/10.1007/BF01772352

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