Investigations into the Speciation of Inorganic Arsenic in Weakly Alkaline Medium by Voltammetry

Elza A. Zakharova, Galina N. Noskova, Marina L. Moskaleva, Elena E. Elesova, Gregory G. Wildgoose

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)


    The speciation of inorganic forms of arsenic was studied using anodic stripping voltammetry (ASV) at a gold microelectrode in conjunction with photoreduction of As(V). Sodium sulfite (0.1M) and ammonium buffer (pH≥9.5) were selected as both background electrolyte and photo-reductive reagent. Oxygen was removed by radical chain reactions with sulfite. The proposed speciation method was validated for mixtures of arsenic As(III/V) at concentrations up to 1mgL<sup>-1</sup>. The calculated LOD of As(III/V) was 0.06μgL<sup>-1</sup> (3σ, t<inf>dep</inf> 40s). Any interference from nitrate anions present at up to millimolar concentration was minimized by their photoreduction.

    Original languageEnglish
    Pages (from-to)890-901
    Number of pages12
    Issue number4
    Publication statusPublished - 1 Apr 2015


    • Anodic stripping voltammetry
    • Arsenic speciation
    • Gold microelectrode ensemble
    • Photoreduction
    • Sodium sulfite

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Electrochemistry

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