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dc.contributor.authorTakeuchi, Regina M.
dc.contributor.authorSantos, Andre L.
dc.contributor.authorPadilha, Pedro M.
dc.contributor.authorStradiotto, Nelson Ramos [UNESP]
dc.date.accessioned2014-05-20T13:53:20Z
dc.date.available2014-05-20T13:53:20Z
dc.date.issued2007-02-15
dc.identifierhttp://dx.doi.org/10.1016/j.talanta.2006.05.035
dc.identifier.citationTalanta. Amsterdam: Elsevier B.V., v. 71, n. 2, p. 771-777, 2007.
dc.identifier.issn0039-9140
dc.identifier.urihttp://hdl.handle.net/11449/19035
dc.description.abstractSolid paraffin-based carbon paste electrodes modified with 2-aminothiazole organofunctionalized silica have been applied to the anodic stripping determination of copper ions in ethanol fuel samples without any sample treatment. The proposed method comprised four steps: (1) copper ions preconcentration at open circuit potential directly in the ethanol fuel sample; (2) exchange of the solution and immediate cathodic reduction of the absorbate at controlled potential; (3) differential pulse anodic stripping voltammetry; (4) electrochemical surface regeneration by applying a positive potential in acid media. Factors affecting the preconcentration, reduction and stripping steps were investigated and the optimum conditions were employed to develop the analytical procedure. Using a preconcentration time of 20 min and reduction time of 120 s at -0.3 V versus Ag/AgCl(sat) a linear range from 7.5 x 10(-8) to 2.5 x 10(-6) mol L(-1) with detection limit of 3.1 x 10(-8) mol L(-1) was obtained. Interference studies have shown a decrease in the interference effect according to the sequence: Ni > Zn > Cd > Pb > Fe. However, the interference effects of these ions have not forbidden the application of the proposed method. Recovery values between 98.8 and 102.3% were obtained for synthetic samples spiked with known amounts of Cu(2+) and interfering metallic ions. The developed electrode was successfully applied to the determination of Cu(2+) in commercial ethanol fuel samples. The results were compared to those obtained by flame atomic absorption spectroscopy by using the F-test and t-test. Neither F-value nor t-value have exceeded the critical values at 95% confidence level, confirming that there are no significant differences between the results obtained by both methods. (c) 2006 Elsevier B.V. All rights reserved.en
dc.format.extent771-777
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofTalanta
dc.sourceWeb of Science
dc.subjectethanol fuelpt
dc.subjectsolid paraffin-based carbon paste electrodespt
dc.subjectorganofunctionalized silicapt
dc.subjectcopper ionspt
dc.subjectdifferential pulse stripping voltammetrypt
dc.titleCopper determination in ethanol fuel by differential pulse anodic stripping voltammetry at a solid paraffin-based carbon paste electrode modified with 2-aminothiazole organofunctionalized silicaen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.description.affiliationUNESP, Inst Quim, Dept Quim Analit, Araraquara, Brazil
dc.description.affiliationUNESP, IB, Dept Quim & Bioquim, Botucatu, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Quim, Dept Quim Analit, Araraquara, Brazil
dc.description.affiliationUnespUNESP, IB, Dept Quim & Bioquim, Botucatu, SP, Brazil
dc.identifier.doi10.1016/j.talanta.2006.05.035
dc.identifier.wosWOS:000244369600039
dc.rights.accessRightsAcesso restrito
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Botucatupt
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.author.orcid0000-0002-8779-9585[4]
unesp.author.orcid0000-0002-2856-1059[2]
unesp.author.orcid0000-0003-4179-0574[3]
unesp.author.orcid0000-0002-1227-5242[4]
dc.relation.ispartofjcr4.244
dc.relation.ispartofsjr1,186
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