OnLine coupling of a flow injection system to TS-FF-AAS for preconcentration and determination of lead in water and vegetables

dc.creatorTarley, CRT
dc.creatorArruda, MAZ
dc.date2005
dc.date2014-11-18T02:29:25Z
dc.date2015-11-26T17:45:27Z
dc.date2014-11-18T02:29:25Z
dc.date2015-11-26T17:45:27Z
dc.date.accessioned2018-03-29T00:27:48Z
dc.date.available2018-03-29T00:27:48Z
dc.identifierAnalytical Letters. Taylor & Francis Inc, v. 38, n. 9, n. 1427, n. 1443, 2005.
dc.identifier0003-2719
dc.identifierWOS:000230998200008
dc.identifier10.1081/AL-200062229
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/69452
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/69452
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/69452
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1288184
dc.descriptionAn online solid phase preconcentration system coupled to thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) for Pb(II) ions determination is described. In the preconcentration system, Pb( II) ions complexed with ammonium O,O-diethyl-dithiophosphate (DDTP) in an acidic medium are preconcentrated as a neutral complex onto 20 mg of polyurethane foam (PUF) packed into a mini-column. The complex retained in the PUF is then released to TS-FF-AAS by using an 80% (v/v) ethanol solution. Chemical and flow variables associated with the preconcentration, such as the pH dependence of the Pb-DDTP complex, the DDTP concentration, and preconcentration and elution flow rates were optimized by the univariate method. The best sample pH value and DDTP concentration achieved are 2.0 and 0.5% (w/v), respectively, while the best preconcentration and elution flow rates are 2.4 and 1.0 mL min(-1), respectively. Under the optimized conditions, the present method, which is operated in volume mode ( only 2 mL), makes possible the determination of Pb( II) ions within a linear range from 5.2 to 300.0 mu g L-1 with a detection limit of 1.5 mu g L-1 and analytical frequency of 16 h(-1). The precision (n = 10) assessed as relative standard deviation (RSD) is, respectively, 7.3 and 4.8% for 6 and 200 mu g L-1 solutions of Pb(II). The preconcentration system provides an enrichment factor of 6.4 and consumption index of 310 mu L. Hence, the coupling of the preconcentration system to TS-FF-AAS is proven to be an efficient strategy to enhance TS-FF-AAS detectability. The applicability of the method was verified by analyses of spiked water samples as well as with certified and reference vegetable materials.
dc.description38
dc.description9
dc.description1427
dc.description1443
dc.languageen
dc.publisherTaylor & Francis Inc
dc.publisherPhiladelphia
dc.publisherEUA
dc.relationAnalytical Letters
dc.relationAnal. Lett.
dc.rightsfechado
dc.rightshttp://journalauthors.tandf.co.uk/permissions/reusingOwnWork.asp
dc.sourceWeb of Science
dc.subjectflow preconcentration system
dc.subjectTS-FF-AAS
dc.subjectlead determination
dc.subjectpolyurethane foam
dc.subjectAtomic-absorption-spectrometry
dc.subjectSorbent Extraction
dc.subjectPolyurethane Foam
dc.subjectChelating Agent
dc.subjectEnvironmental-samples
dc.subjectFactorial Design
dc.subjectDoehlert Matrix
dc.subjectCadmium
dc.subjectCopper
dc.subjectDialkyldithiophosphates
dc.titleOnLine coupling of a flow injection system to TS-FF-AAS for preconcentration and determination of lead in water and vegetables
dc.typeArtículos de revistas


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