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- DOI: 10.1149/1.1756892
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Electrochemical and surface analytical studies of enargite in acid solution.
Asbjoernsson, J.; Kelsall, G. H.; Pattrick, R. A. D.; Vaughan, D. J.; Wincott, P. L.; Hope, G. A
Journal of the Electrochemical Society. 2004;151:E250-E256.
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Full-text held externally
- DOI: 10.1149/1.1756892
Abstract
The electrochem. oxidn. and redn. of the surface of natural enargite (Cu3AsS4) was studied in 0.1M HCl soln. using cyclic voltammetry and chronoamperometry. Surface anal. by ex situ XPS and in situ Raman spectroscopy, together with aq. phase anal. by inductively coupled plasma-at. emission spectrometry (ICP-AES), were used to aid in the interpretation of the electrochem. behavior of this complex system. XPS analyses on enargite oxidized at potentials >0.2 V (SCE) detected the presence of CuII surface species, with assocd. sulfate and chloride. At potentials <0.6 V (SCE), oxidn. of As was detected with possible minor amts. of AsV at higher potentials. Anal. of the electrolyte in contact with enargite showed that the amt. of dissolved S increased under reducing potentials due to H2S formation and at oxidizing potentials due to the formation of sulfoxy species. The amt. of dissolved Cu increased at potentials >0.2 V (SCE), whereas dissolved As concns. were negligible over the entire potential range studied. Raman spectroscopy provided addnl. evidence of elemental S formation at oxidizing potentials at which sulfate forming reactions occurred in parallel. The S was responsible for an active-passive transition obsd. at .apprx.0.3 V (SCE) in voltammograms. [on SciFinder (R)]
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