Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/7786
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dc.contributor.authorFerreira, Sergio Luis Costa-
dc.contributor.authorLemos, Valfredo Azevedo-
dc.contributor.authorSantelli, Ricardo Erthal-
dc.contributor.authorGanzarolli, Edgard-
dc.contributor.authorCurtius, Adilson José-
dc.creatorFerreira, Sergio Luis Costa-
dc.creatorLemos, Valfredo Azevedo-
dc.creatorSantelli, Ricardo Erthal-
dc.creatorGanzarolli, Edgard-
dc.creatorCurtius, Adilson José-
dc.date.accessioned2013-01-10T12:42:58Z-
dc.date.issued2001-
dc.identifier.issn0026-265X-
dc.identifier.urihttp://www.repositorio.ufba.br/ri/handle/ri/7786-
dc.descriptionTexto completo: acesso restrito. p. 41–46pt_BR
dc.description.abstractThe use of Amberlite XAD-2 modified by 2-(2-benzothiazolylazo)-2-p-cresol (BTAC) as a sorbent in an on-line pre-concentration system for lead determination has been proposed. The procedure is based on the sorption of lead(II) ions onto a minicolumn packed with modified Amberlite XAD-2, followed by elution with 0.10 mol l−1 hydrochloric acid and determination by flame atomic absorption spectrometry. The on-line flow system uses four three-way solenoid valves and is electronically controlled in a time-based mode. Chemical and flow variables were optimized. The results demonstrated that sample solutions containing lead(II) in the concentration range from 3.7 to 300.0 μg l−1 in a solution of pH between 6.5 and 8.5 could be determined, using a pre-concentration time of 2 min. The enrichment factor was 27 for a sample volume of 4.50 ml. The limit of detection was 3.7 μg l−1. The relative standard deviations (R.S.D.) were in the range of 4.4–2.3% for lead concentrations from 50.0 to 300.0 μg l−1, respectively. The method was tolerant to other ions usually present in biological samples. Good accuracy was assured by the analysis of biological reference materials.pt_BR
dc.language.isoenpt_BR
dc.sourcehttp://dx.doi.org/10.1016/S0026-265X(00)00166-1pt_BR
dc.subjectFlame atomic absorption spectrometrypt_BR
dc.subjectFlow injection systempt_BR
dc.subjectAmberlite XAD-2pt_BR
dc.subject2-(2-benzothiazolylazo)-2-p-cresolpt_BR
dc.subjectLeadpt_BR
dc.titleAn automated on-line flow system for the pre-concentration and determination of lead by flame atomic absorption spectrometrypt_BR
dc.title.alternativeMicrochemical Journalpt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 68, n. 1pt_BR
dc.embargo.liftdate10000-01-01-
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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