| dc.contributor | Universidade Estadual Paulista (UNESP) | |
| dc.creator | de Almeida, Eduardo | |
| dc.creator | do Nascimento Filho, Virgilio Franco | |
| dc.creator | Menegario, Amauri Antonio | |
| dc.date | 2014-05-20T15:32:03Z | |
| dc.date | 2016-10-25T18:08:09Z | |
| dc.date | 2014-05-20T15:32:03Z | |
| dc.date | 2016-10-25T18:08:09Z | |
| dc.date | 2012-05-01 | |
| dc.date.accessioned | 2017-04-06T00:25:39Z | |
| dc.date.available | 2017-04-06T00:25:39Z | |
| dc.identifier | Spectrochimica Acta Part B-atomic Spectroscopy. Oxford: Pergamon-Elsevier B.V. Ltd, v. 71-72, p. 70-74, 2012. | |
| dc.identifier | 0584-8547 | |
| dc.identifier | http://hdl.handle.net/11449/41055 | |
| dc.identifier | http://acervodigital.unesp.br/handle/11449/41055 | |
| dc.identifier | 10.1016/j.sab.2012.05.006 | |
| dc.identifier | WOS:000307923500010 | |
| dc.identifier | http://dx.doi.org/10.1016/j.sab.2012.05.006 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/883782 | |
| dc.description | The 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. | |
| dc.description | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
| dc.description | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | |
| dc.language | eng | |
| dc.publisher | Pergamon-Elsevier B.V. Ltd | |
| dc.relation | Spectrochimica Acta Part B-atomic Spectroscopy | |
| dc.rights | info:eu-repo/semantics/closedAccess | |
| dc.subject | fresh water | |
| dc.subject | paper-based DGT | |
| dc.subject | EDXRF | |
| dc.subject | SR-TXRF | |
| dc.title | 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 | |
| dc.type | Otro | |
