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  • Title: Increased sensitivity of anodic stripping voltammetry at the hanging mercury drop electrode by ultracathodic deposition.
    Author: Rodrigues JA, Rodrigues CM, Almeida PJ, Valente IM, Gonçalves LM, Compton RG, Barros AA.
    Journal: Anal Chim Acta; 2011 Sep 09; 701(2):152-6. PubMed ID: 21801881.
    Abstract:
    An improved approach to the anodic stripping voltammetric (ASV) determination of heavy metals, using the hanging mercury drop electrode (HMDE), is reported. It was discovered that using very cathodic accumulation potentials, at which the solvent reduction occurs (overpotential deposition), the voltammetric signals of zinc(II), cadmium(II), lead(II) and copper(II) increase. When compared with the classical methodology a 5 to 10-fold signal increase is obtained. This effect is likely due to both mercury drop oscillation at such cathodic potentials and added local convection at the mercury drop surface caused by the evolution of hydrogen bubbles.
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