Copper determination in ethanol fuel samples by anodic stripping voltammetry at a gold microelectrode

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dc.contributor.authorTakeuchi, Regina M. [UNESP]
dc.contributor.authorSantos, Andre L. [UNESP]
dc.contributor.authorMedeiros, Maria J.
dc.contributor.authorStradiotto, Nelson Ramos [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Minho
dc.date.accessioned2014-05-20T14:19:25Z
dc.date.available2014-05-20T14:19:25Z
dc.date.issued2009-01-01
dc.description.abstractA linear sweep anodic stripping voltammetric method was developed for copper determination in commercial ethanol fuel samples by using a gold microelectrode. Under the optimized conditions, a linear range from 0.05 to 1.0 mu M was obtained, with detection limit of 22 nM. The method was employed to determine copper ions in six commercial ethanol fuel samples and the results were compared with those obtained by FAAS. This study showed that for most samples both methods produced concordant results. However, for two samples, copper is distributed in its labile and complexed forms leading to copper contents contrasting with those obtained by flame atomic absorption spectroscopy (FAAS). It was observed that acidification of the samples is a very efficient way to recover copper from its complexed forms. After acidification, the copper contents obtained were concordant with those obtained by FAAS. Thus, the method can be employed to the reliable copper determination in commercial ethanol fuel samples. Moreover, this is the first work providing some insights about copper speciation in commercial ethanol fuel samples.en
dc.description.affiliationUniv Estadual Paulista UNESP, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUniv Minho, Ctr Quim, P-4704553 Braga, Portugal
dc.description.affiliationUnespUniv Estadual Paulista UNESP, BR-14801970 Araraquara, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCAPES: 1088068
dc.description.sponsorshipIdCAPES: 1087061
dc.description.sponsorshipIdFAPESP: 03/05567-7
dc.description.sponsorshipIdFAPESP: 03/09334-7
dc.format.extent101-106
dc.identifierhttp://dx.doi.org/10.1007/s00604-008-0039-9
dc.identifier.citationMicrochimica Acta. Wien: Springer Wien, v. 164, n. 1-2, p. 101-106, 2009.
dc.identifier.doi10.1007/s00604-008-0039-9
dc.identifier.issn0026-3672
dc.identifier.lattes0072173018005712
dc.identifier.urihttp://hdl.handle.net/11449/25857
dc.identifier.wosWOS:000262438900014
dc.language.isoeng
dc.publisherSpringer Wien
dc.relation.ispartofMicrochimica Acta
dc.relation.ispartofjcr5.705
dc.relation.ispartofsjr1,240
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectEthanol fuel samplesen
dc.subjectAnodic stripping voltammetryen
dc.subjectCopperen
dc.subjectGold microelectrodeen
dc.titleCopper determination in ethanol fuel samples by anodic stripping voltammetry at a gold microelectrodeen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer Wien
unesp.author.lattes0072173018005712
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Química Analítica - IQ