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 journalArticle

    5 Citations (Scopus)

    Abstract

    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
    JournalElectroanalysis
    Volume27
    Issue number4
    DOIs
    Publication statusPublished - 1 Apr 2015

      Fingerprint

    Keywords

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

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Electrochemistry

    Cite this

    Zakharova, E. A., Noskova, G. N., Moskaleva, M. L., Elesova, E. E., & Wildgoose, G. G. (2015). Investigations into the Speciation of Inorganic Arsenic in Weakly Alkaline Medium by Voltammetry. Electroanalysis, 27(4), 890-901. https://doi.org/10.1002/elan.201500034