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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/14509
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dc.contributor.authorSouza, Anderson Santos-
dc.contributor.authorBrandão, Geovani Cardoso-
dc.contributor.authorSantos, Walter Nei Lopes dos-
dc.contributor.authorLemos, Valfredo Azevedo-
dc.contributor.authorGanzarolli, Edgard Moreira-
dc.contributor.authorBruns, Roy Edward-
dc.contributor.authorFerreira, Sergio Luis Costa-
dc.creatorSouza, Anderson Santos-
dc.creatorBrandão, Geovani Cardoso-
dc.creatorSantos, Walter Nei Lopes dos-
dc.creatorLemos, Valfredo Azevedo-
dc.creatorGanzarolli, Edgard Moreira-
dc.creatorBruns, Roy Edward-
dc.creatorFerreira, Sergio Luis Costa-
dc.date.accessioned2014-01-31T14:58:25Z-
dc.date.issued2007-
dc.identifier.issn0304-3894-
dc.identifier.urihttp://repositorio.ufba.br/ri/handle/ri/14509-
dc.descriptionTexto completo: acesso restrito. p. 540-545pt_BR
dc.description.abstractAn automatic on-line pre-concentration system is proposed for lead determination in drinking water using flame atomic absorption spectrometry (FAAS). Lead(II) ions are retained as the 1-(2-pyridylazo)-2-naphthol (PAN) complex in the walls of a knotted reactor, followed by an elution step using 0.50 mol L−1 hydrochloric acid solution. Optimisation involving the sampling flow rate, pH and buffer concentration factors was performed using a Box–Behnken design. Other factors were established considering results of previous experiments. The procedure allows the determination of lead with a 0.43 μg L−1 detection limit (3σ/S) and precisions (expressed as relative standard deviation) of 4.84% (N = 7) and 2.9% (N = 7) for lead concentrations of 5 and 25 μg L−1, respectively. The accuracy was confirmed by the determination of lead in the NIST SRM 1643d trace elements in natural water standard reference material. The pre-concentration factor obtained is 26.5 and the sampling frequency is 48 h−1. The recovery achieved for lead determination in the presence of several ions demonstrated that this procedure could be applied to the analysis of drinking water samples. The method was applied for lead determination in drinking water samples collected in Jequié City, Brazil. The lead concentration found in 25 samples were always lower than the permissible maximum levels stipulated by World Health Organization.pt_BR
dc.language.isoenpt_BR
dc.rightsAcesso Abertopt_BR
dc.sourcehttp://dx.doi.org/10.1016/j.jhazmat.2006.07.015pt_BR
dc.subjectDetermination of leadpt_BR
dc.subjectAutomatic on-line pre-concentration systempt_BR
dc.subjectKnotted reactionpt_BR
dc.subjectFAASpt_BR
dc.subjectDrinking waterpt_BR
dc.subjectBox–Benhken designpt_BR
dc.titleAutomatic on-line pre-concentration system using a knotted reactor for the FAAS determination of lead in drinking waterpt_BR
dc.title.alternativeJournal of Hazardous Materialspt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 141, n. 3pt_BR
dc.embargo.liftdate10000-01-01-
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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