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Direct reduction of As(V) physically attached to a graphite electrode mediated by Fe(III)

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Abstract

As(V) is electrochemically reduced on the surface of a carbonaceous electrode in the presence of hematite and hydrochloric acid 1 M. The influence of other iron oxides (goethite and limonite) was also tested, although they did not provided better results. The potential required to achieve the reduction must be lower than −0.3 V. The anodic voltammograms exhibit a peak at 0.14 V which corresponds to the oxidation of the As° previously generated during the pre-treatment step (−1 V, 5 s) to As(III). Fe(II) generated during the pre-treatment step plays a relevant role in the final reduction to As° which is subsequently reoxidized to As(III) in the anodic scan. This has been applied to the direct detection of 5 mg kg−1 of arsenic in a solid sample of compost with high concentration of iron oxides by square wave voltammetry.

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Acknowledgement

This work was supported by the SGPCCC of the Spanish Ministry of the Environment.

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Authors and Affiliations

  1. Analytical Chemistry Department, Faculty of Sciences, University of Zaragoza, C/Pedro Cerbuna 12, Zaragoza, 50009, Spain

    G. Cepriá, S. Hamida, F. Laborda & J. R. Castillo

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  1. G. Cepriá
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  2. S. Hamida
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  3. F. Laborda
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  4. J. R. Castillo
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Correspondence to G. Cepriá.

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Cepriá, G., Hamida, S., Laborda, F. et al. Direct reduction of As(V) physically attached to a graphite electrode mediated by Fe(III). J Appl Electrochem 37, 1171–1176 (2007). https://doi.org/10.1007/s10800-007-9380-7

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  • DOI: https://doi.org/10.1007/s10800-007-9380-7

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