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dc.contributor.authorFerreira, Hadla S.-
dc.contributor.authorSantos, Walter Nei Lopes dos-
dc.contributor.authorFiuza, Raigenis da Paz-
dc.contributor.authorNóbrega, Joaquim de Araújo-
dc.contributor.authorFerreira, Sergio Luis Costa-
dc.creatorFerreira, Hadla S.-
dc.creatorSantos, Walter Nei Lopes dos-
dc.creatorFiuza, Raigenis da Paz-
dc.creatorNóbrega, Joaquim de Araújo-
dc.creatorFerreira, Sergio Luis Costa-
dc.descriptionTexto completo: acesso restrito. p. 128-131pt_BR
dc.description.abstractThe present work proposes a direct method based on slurry sampling for the determination of zinc and copper in human hair samples by multi-element sequential flame atomic absorption spectrometry. The slurries were prepared by cryogenic grinding and sonication of the samples. The optimization step was performed using univariate methodology and the factors studied were: nature and concentration of the acid solution, amount sample/slurry volume, sonication time, and particle size. The established experimental conditions are the use of a sample mass of 50 mg, 2 mol L− 1 nitric acid solution, sonication time of 20 min and slurry volume of 10 mL. Adopting the optimized conditions, this method allows the determination of zinc and copper with detection limits of 88.3 and 53.3 ng g− 1, respectively, and precision expressed as relative standard deviation (RSD) of 1.7% and 1.6% (both, n = 10) for contents of zinc and copper of 100.0 and 33.3 μg g− 1, respectively. The accuracy was checked and confirmed by analysis of two certified reference materials of human hair. The procedure was applied for the determination of zinc and copper in two human hair samples. The zinc and copper contents varied from 100.0 to 175.6 and from 3.2 to 32.8 μg g− 1, respectively. These samples were also analyzed after complete digestion in a closed system and determination by FAAS. The statistical comparison by t-test (95% confidence level) showed no significant difference between these results.pt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectHuman hairpt_BR
dc.subjectSlurry samplingpt_BR
dc.subjectSequential multi-element flame atomic absorption spectrometrypt_BR
dc.titleDetermination of zinc and copper in human hair by slurry sampling employing sequential multi-element flame atomic absorption spectrometrypt_BR
dc.title.alternativeMicrochemical Journalpt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 87, n. 2pt_BR
Appears in Collections:Artigo Publicado em Periódico (Química)

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