Electrochemical study of arsenopyrite weathering

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dc.contributor.authorAlmeida, CMVB
dc.contributor.authorGiannetti, B. F.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-03-18T15:54:16Z
dc.date.available2015-03-18T15:54:16Z
dc.date.issued2003-01-01
dc.description.abstractCyclic voltammograms and capacitance measurements are presented to characterize the mineral response at relatively moderate environmental conditions, pH 4.5 and T = 25degreesC. 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.en
dc.description.affiliationUniv Estadual Paulista, Inst Ciencias Exatas & Tecnol, LaFTA, BR-04026002 Sao Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Ciencias Exatas & Tecnol, LaFTA, BR-04026002 Sao Paulo, Brazil
dc.format.extent604-610
dc.identifierhttp://dx.doi.org/10.1039/b210631k
dc.identifier.citationPhysical Chemistry Chemical Physics. Cambridge: Royal Soc Chemistry, v. 5, n. 3, p. 604-610, 2003.
dc.identifier.doi10.1039/b210631k
dc.identifier.issn1463-9076
dc.identifier.urihttp://hdl.handle.net/11449/116852
dc.identifier.wosWOS:000180427300025
dc.language.isoeng
dc.publisherRoyal Soc Chemistry
dc.relation.ispartofPhysical Chemistry Chemical Physics
dc.relation.ispartofjcr3.906
dc.relation.ispartofsjr1,686
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleElectrochemical study of arsenopyrite weatheringen
dc.typeArtigo
dcterms.rightsHolderRoyal Soc Chemistry
unesp.author.orcid0000-0002-2337-4457[2]
unesp.author.orcid0000-0002-0473-906X[1]

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