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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/12282
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dc.contributor.authorLemos, Valfredo Azevedo-
dc.contributor.authorSantelli, Ricardo Erthal-
dc.contributor.authorCarvalho, Marcelo Souza de-
dc.contributor.authorFerreira, Sergio Luis Costa-
dc.creatorLemos, Valfredo Azevedo-
dc.creatorSantelli, Ricardo Erthal-
dc.creatorCarvalho, Marcelo Souza de-
dc.creatorFerreira, Sergio Luis Costa-
dc.date.accessioned2013-07-24T17:11:33Z-
dc.date.available2013-07-24T17:11:33Z-
dc.date.issued2000-
dc.identifier.issn0584-8547-
dc.identifier.urihttp://www.repositorio.ufba.br/ri/handle/ri/12282-
dc.descriptionTexto completo. Acesso restrito. p. 1497–1502pt_BR
dc.description.abstractIn the present paper, the use of polyurethane foam modified by 2-(2-benzothiazolylazo)-2-p-cresol (BTAC) as a sorbent in an on-line preconcentration system to determine cadmium trace levels by FAAS is proposed. The procedure was based on the chemical sorption of cadmium (II) ions onto a minicolumn packed with polyurethane foam, followed by 0.10 mol l−1 hydrochloric acid elution and direct determination by Flame Atomic Absorption Spectrometry. The flow system was operated in a time-based mode. Chemical and flow variables were studied. Results demonstrated that sample solutions containing cadmium(II) in the range of concentration from 0.91 to 30.00 μg l−1, pH between 6.50 and 9.25 could be determinated by this procedure, in a preconcentration time of 1 min. Flow rates in preconcentration and elution steps were 7.00 and 4.00 ml min−1, respectively. The precision of the preconcentration procedure (evaluated as standard deviation of solutions containing 1.0–30.0 μg l−1 of cadmium) varied in the range from 5 to 1%. The preconcentration factor, calculated as the ratio of the linear section of the slopes of the analytical curves before and after preconcentration, was 41, for a volume sample of 7.00 ml. The detection limit was 0.27 μg l−1 for a preconcentration time of 1 min. The proposed procedure was applied for determination of cadmium in biological reference materials. Achieved results demonstrated that the procedure can be applied for analysis of biological materials with satisfactory accuracy.pt_BR
dc.language.isoenpt_BR
dc.publisherSpectrochimica Acta Part B: Atomic Spectroscopypt_BR
dc.sourcehttp://dx.doi.org.ez10.periodicos.capes.gov.br/10.1016/S0584-8547(00)00257-3pt_BR
dc.subjectCadmiumpt_BR
dc.subjectOn-line preconcentrationpt_BR
dc.subjectPolyurethane foampt_BR
dc.subjectFlame AASpt_BR
dc.titleApplication of polyurethane foam loaded with BTAC in an on-line preconcentration system: cadmium determination by FAASpt_BR
dc.title.alternativeSpectrochimica Acta Part B: Atomic Spectroscopypt_BR
dc.typeArtigo de Periódicopt_BR
dc.description.localpubSalvadorpt_BR
dc.identifier.numberv. 55, n. 9pt_BR
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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