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Issue 3, 2003
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Electrochemical study of arsenopyrite weathering

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Cyclic voltammograms and capacitance measurements are presented to characterize the mineral response at relatively moderate environmental conditions, pH 4.5 and T = 25 °C. The experiments involve examining the rates of oxidation and the surface morphology of arsenopyrite, which is oxidized abiotically. The semiconducting properties of the mineral have been investigated in attempt to gain additional information of FeAsS dissolution behavior in acidic solutions at potentials close to the open circuit potential of the mineral. A mechanistic pathway for the anodic dissolution of arsenopyrite in open circuit conditions is also suggested. At high overpotentials, anodic reactions produce mainly sulfate and arsenate ions and may be described as hole limited. The reduction of orpiment-like compounds at potentials more negative than the open circuit potential is discussed.

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Publication details

The article was received on 29 Oct 2002, accepted on 05 Dec 2002 and first published on 18 Dec 2002

Article type: Paper
DOI: 10.1039/B210631K
Citation: Phys. Chem. Chem. Phys., 2003,5, 604-610
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    Electrochemical study of arsenopyrite weathering

    C. M. V. B. Almeida and B. F. Giannetti, Phys. Chem. Chem. Phys., 2003, 5, 604
    DOI: 10.1039/B210631K

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