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  • Electrochemical and Surface Analytical Studies of Tennantite in Acid Solution

    Author(s)
    Asbjornsson, J
    Kelsall, GH
    Vaughan, DJ
    Pattrick, RAD
    Wincott, PL
    Hope, GA
    Griffith University Author(s)
    Hope, Gregory A.
    Year published
    2004
    Metadata
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    Abstract
    The electrochemical oxidation and reduction of the surface of a natural tennantite has been investigated in 0.1 M HCl solution using cyclic voltammetry, chronoamperometry and a rotating ring-disc electrode. Subsequent surface analyses by in situ Raman spectroscopy and ex situ X-ray photoelectron spectroscopy (XPS), together with aqueous phase analysis by inductively coupled plasma-atomic emission spectrometry (ICP-AES) were used to aid in the interpretation of the electrochemical behaviour of this complex system, coupled with Nernst equation predictions of the surface reactions. The XPS results indicated that elemental sulfur, ...
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    The electrochemical oxidation and reduction of the surface of a natural tennantite has been investigated in 0.1 M HCl solution using cyclic voltammetry, chronoamperometry and a rotating ring-disc electrode. Subsequent surface analyses by in situ Raman spectroscopy and ex situ X-ray photoelectron spectroscopy (XPS), together with aqueous phase analysis by inductively coupled plasma-atomic emission spectrometry (ICP-AES) were used to aid in the interpretation of the electrochemical behaviour of this complex system, coupled with Nernst equation predictions of the surface reactions. The XPS results indicated that elemental sulfur, arsenic(III) and arsenic(V) oxides were formed on the surface at electrode potentials of 0 and 0.6 V (SCE), respectively. The Raman spectra of tennantite showed that elemental sulfur was detected on the electrode surface only at potentials 1 V (SCE), at least for the charge densities passed after 500 s. At potentials <-0.4 V (SCE), the intensities of the characteristic Raman spectra for sulfur decreased with decreasing potentials, due to the dissolution of sulfur as H2S (and possibly arsenic as AsH3), leaving Cu3As or elemental copper and iron accumulating on the surface.
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    Journal Title
    Journal of Electroanalytical Chemistry
    Volume
    570
    Publisher URI
    http://www.elsevier.com/wps/find/journaldescription.cws_home/504087/description#description
    Copyright Statement
    © 2004 Elsevier : Reproduced in accordance with the copyright policy of the publisher : This journal is available online - use hypertext links.
    Subject
    Analytical chemistry
    Macromolecular and materials chemistry
    Theoretical and computational chemistry
    Publication URI
    http://hdl.handle.net/10072/5708
    Collection
    • Journal articles

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