Paper-based diffusive gradients in thin films technique coupled to energy dispersive X-ray fluorescence spectrometry for the determination of labile Mn, Co, Ni, Cu, Zn and Pb in river water

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dc.contributor.authorde Almeida, Eduardo
dc.contributor.authordo Nascimento Filho, Virgilio Franco
dc.contributor.authorMenegario, Amauri Antonio
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:32:03Z
dc.date.available2014-05-20T15:32:03Z
dc.date.issued2012-05-01
dc.description.abstractThe diffusive gradients in thin films (DGT) technique has shown enormous potential for labile metal monitoring in fresh water due to the preconcentration, time-integrated, matrix interference removal and speciation analytical features. In this work, the coupling of energy dispersive X-ray fluorescence (EDXRF) with paper-based DGT devices was evaluated for the direct determination of Mn, Co. Ni, Cu, Zn and Pb in fresh water. The DGT samplers were assembled with cellulose (Whatman 3 MM chromatography paper) as the diffusion layer and a cellulose phosphate ion exchange membrane (Whatman P 81 paper) as the binding agent. The diffusion coefficients of the analytes on 3 MM chromatography paper were calculated by deploying the DGT samplers in synthetic solutions containing 500 mu g L-1 of Mn. Co, Ni, Cu, Zn and Pb (4 L at pH 5.5 and ionic strength at 0.05 mol L-1). After retrieval, the DGT units were disassembled and the P81 papers were dried and analysed by EDXRF directly. The 3 MM chromatographic paper diffusion coefficients of the analytes ranged from 1.67 to 1.87 x 10(-6) cm(2) s(-1). The metal retention and phosphate group homogeneities on the P81 membrane was studied by a spot analysis with a diameter of 1 mm. The proposed approach (DGT-EDXRF coupling) was applied to determine the analytes at five sampling sites (48 h in situ deployment) on the Piracicaba river basin, and the results (labile fraction) were compared with 0.45 mu m dissolved fractions determined by synchrotron radiation-excited total reflection X-ray fluorescence (SR-TXRF). The limits of detection of DGT-EDXRF coupling for the analytes (from 7.5 to 26 mu g L-1) were similar to those obtained by the sensitive SR-TXRF technique (3.8 to 9.1 mu g L-1). (C) 2012 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv São Paulo, Ctr Energia Nucl Agr, Lab Instrumentacao Nucl, BR-13416903 Piracicaba, SP, Brazil
dc.description.affiliationUNESP Univ Estadual Paulista, Ctr Estudos Ambientais, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUnespUNESP Univ Estadual Paulista, Ctr Estudos Ambientais, BR-13506900 Rio Claro, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipLaboratório Nacional de Luz Síncrotron (LNLS)
dc.description.sponsorshipIdLNLS - Brazilian Synchrotron Light Laboratory/MCT: D09-XRF-10113
dc.format.extent70-74
dc.identifierhttp://dx.doi.org/10.1016/j.sab.2012.05.006
dc.identifier.citationSpectrochimica Acta Part B-atomic Spectroscopy. Oxford: Pergamon-Elsevier B.V. Ltd, v. 71-72, p. 70-74, 2012.
dc.identifier.doi10.1016/j.sab.2012.05.006
dc.identifier.issn0584-8547
dc.identifier.urihttp://hdl.handle.net/11449/41055
dc.identifier.wosWOS:000307923500010
dc.language.isoeng
dc.publisherPergamon-Elsevier B.V. Ltd
dc.relation.ispartofSpectrochimica Acta Part B-atomic Spectroscopy
dc.relation.ispartofjcr2.854
dc.relation.ispartofsjr0,960
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectfresh wateren
dc.subjectpaper-based DGTen
dc.subjectEDXRFen
dc.subjectSR-TXRFen
dc.titlePaper-based diffusive gradients in thin films technique coupled to energy dispersive X-ray fluorescence spectrometry for the determination of labile Mn, Co, Ni, Cu, Zn and Pb in river wateren
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderPergamon-Elsevier B.V. Ltd

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