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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/14392
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dc.contributor.authorMaranhão, Tatiane de A.-
dc.contributor.authorMartendal, Edmar-
dc.contributor.authorBorges, Daniel L. G.-
dc.contributor.authorCarasek, Eduardo-
dc.contributor.authorWelz, Bernhard-
dc.contributor.authorCurtius, Adilson José-
dc.creatorMaranhão, Tatiane de A.-
dc.creatorMartendal, Edmar-
dc.creatorBorges, Daniel L. G.-
dc.creatorCarasek, Eduardo-
dc.creatorWelz, Bernhard-
dc.creatorCurtius, Adilson José-
dc.date.accessioned2014-01-20T15:48:11Z-
dc.date.issued2007-
dc.identifier.issn0584-8547-
dc.identifier.urihttp://repositorio.ufba.br/ri/handle/ri/14392-
dc.descriptionTexto completo: acesso restrito. p. 1019-1027pt_BR
dc.description.abstractCloud point extraction (CPE) is proposed as a pre-concentration procedure for the determination of Pb and Cd in undigested urine by graphite furnace atomic absorption spectrometry (GF AAS). Aliquots of 0.5 mL urine were acidified with HCl and the chelating agent ammonium O,O-diethyl dithiophosphate (DDTP) was added along with the non-ionic surfactant Triton X-114 at the optimized concentrations. Phase separation was achieved by heating the mixture to 50 °C for 15 min. The surfactant-rich phase was analyzed by GF AAS, employing the optimized pyrolysis temperatures of 900 °C for Pb and 800 °C for Cd, using a graphite tube with a platform treated with 500 μg Ru as permanent modifier. The reagent concentrations for CPE (HCl, DDTP and Triton X-114) were optimized using a Box–Behnken design. The response surfaces and the optimum values were very similar for aqueous solutions and for the urine samples, demonstrating that aqueous standards submitted to CPE could be used for calibration. Detection limits of 40 and 2 ng L− 1 for Pb and Cd, respectively, were obtained along with an enhancement factor of 16 for both analytes. Three control urine samples were analyzed using this approach, and good agreement was obtained at a 95% statistical confidence level between the certified and determined values. Five real samples have also been analyzed before and after spiking with Pb and Cd, resulting in recoveries ranging from 97 to 118%.pt_BR
dc.language.isoenpt_BR
dc.rightsAcesso Abertopt_BR
dc.sourcehttp://dx.doi.org/10.1016/j.sab.2007.05.008pt_BR
dc.subjectCloud point extractionpt_BR
dc.subjectGraphite furnace atomic absorption spectrometrypt_BR
dc.subjectUrinept_BR
dc.subjectCadmium determinationpt_BR
dc.subjectLead determinationpt_BR
dc.subjectPermanent modifierpt_BR
dc.titleCloud point extraction for the determination of lead and cadmium in urine by graphite furnace atomic absorption spectrometry with multivariate optimization using Box–Behnken designpt_BR
dc.title.alternativeSpectrochimica Acta Part B: Atomic Spectroscopypt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 62, n. 9pt_BR
dc.embargo.liftdate10000-01-01-
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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