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

Zakharova, Elza A, Noskova, Galina N., Moskaleva, Marina L., Elesova, Elena E. and Wildgoose, Gregory (2015) Investigation into the Speciation of Inorganic Arsenic in Weakly Alkaline Medium by Voltammetry. Electroanalysis, 27 (4). pp. 890-901. ISSN 1040-0397

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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 (0.1 M) 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 1 mg L−1. The calculated LOD of As(III/V) was 0.06 µg L−1 (3σ, tdep 40 s). Any interference from nitrate anions present at up to millimolar concentration was minimized by their photoreduction.

Item Type: Article
Uncontrolled Keywords: arsenic speciation,anodic stripping voltammetry,gold microelectrode ensemble,photoreduction,sodium sulfite,electrochemistry,analytical chemistry ,/dk/atira/pure/subjectarea/asjc/1600/1603
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Pure Connector
Date Deposited: 14 Aug 2015 14:42
Last Modified: 22 Apr 2020 00:22
URI: https://ueaeprints.uea.ac.uk/id/eprint/54116
DOI: 10.1002/elan.201500034

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