Effect of the competition of Cu(II) and Ni(II) on the kinetic and thermodynamic stabilities of Cr(III)-organic ligand complexes using competitive ligand exchange (EDTA)

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dc.contributor.authorCunha, Graziele da Costa
dc.contributor.authorGoveia, Danielle [UNESP]
dc.contributor.authorCruz Romao, Luciane Pimenta
dc.contributor.authorOliveira, Luciana Camargo de
dc.contributor.institutionUniv Fed Sergipe
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2015-10-21T20:27:13Z
dc.date.available2015-10-21T20:27:13Z
dc.date.issued2015-05-01
dc.description.abstractThe effect of competition of Cu(II) and Ni(II) on the kinetic stability of Cr(III) complexed with natural organic matter (NOM) was characterized using EDTA exchange with single-stage tangential-flow ultrafiltration. For a water sample from Serra de Itabaiana, 3% of spiked Cr(III) was exchanged, while for a sample from the Itapanhau River, 7, 10, 10, and 21% was exchanged in experiments using Cr(III) alone and in combination with Cu(ll), NOD, or Cu(II) + Ni(II), respectively. Times required to reach exchange equilibrium with EDTA were less than 360 min. The influence of competition from Ni(II) and Cu(II) on the availability of complexed Cr(III) was low, demonstrating preference of the ligand sites for Cr(III). This was correlated with sample humification, as confirmed by EPR and C-13 NMR analyses. Exchange efficiency was in the order Cu > Ni > Cr, and the process could be readily described by first order kinetics, with average rate constants of 0.35-0.37 11-1. (C) 2015 Elsevier Ltd. All rights reserved.en
dc.description.affiliationUniv Fed Sergipe, Dept Chem, BR-49100000 Sao Cristovao, SE, Brazil
dc.description.affiliationSao Paulo State Univ UNESP, BR-18409010 Itapeva, SP, Brazil
dc.description.affiliationFed Univ Sao Carlos UFSCar, Dept Phys Chem &Math, BR-18052780 Sorocaba, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ UNESP, BR-18409010 Itapeva, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCNPq: 307029/2013-1
dc.format.extent259-265
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S0301479715001139
dc.identifier.citationJournal Of Environmental Management. London: Academic Press Ltd- Elsevier Science Ltd, v. 154, p. 259-265, 2015.
dc.identifier.doi10.1016/j.jenvman.2015.02.038
dc.identifier.issn0301-4797
dc.identifier.urihttp://hdl.handle.net/11449/129143
dc.identifier.wosWOS:000352671500028
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal Of Environmental Management
dc.relation.ispartofjcr4.005
dc.relation.ispartofsjr1,161
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectAquatic humic substancesen
dc.subjectEDTAen
dc.subjectNickelen
dc.subjectChromeen
dc.subjectCooperen
dc.titleEffect of the competition of Cu(II) and Ni(II) on the kinetic and thermodynamic stabilities of Cr(III)-organic ligand complexes using competitive ligand exchange (EDTA)en
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Ciências e Engenharia, Itapevapt

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