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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/12397

Title: A pre-concentration procedure using coprecipitation for determination of lead and iron in several samples using flame atomic absorption spectrometry
Other Titles: Analytica Chimica Acta
Authors: Ferreira, Sergio Luis Costa
Saracoglu, S.
Soylak, Mustafa
Peker, D. S. Kacar
Elci, L.
Santos, Walter Nei Lopes dos
Lemos, Valfredo Azevedo
Keywords: Pre-concentration;Coprecipitation;ron;Lead;Factorial design
Issue Date: 2006
Abstract: The present paper proposes a pre-concentration procedure for determination of lead and iron in several samples by flame atomic absorption spectrometry. In it, lead(II) and iron(III) ions are coprecipitated using the violuric acid–copper(II) system as collector. Afterwards, the precipitate is dissolved with 1 M HNO3 solution and the metal ions are determined. The optimization step was performed using factorial design involving the variables: pH, violuric acid mass (VA) and copper concentration (Cu). Using the optimized experimental conditions, the proposed procedure allows the determination these metals with detection limits of 0.18 μg L−1 for iron and 0.16 μg L−1 for lead. The effects of foreign ions on the pre-concentration procedure were also evaluated and the results demonstrated that this method could be applied for determination of iron and lead in several real samples. The proposed method was successfully applied to the analysis of seawater, urine, mineral water, soil and physiological solution samples. The concentrations of lead and iron achieved in these samples agree well with others data reported in the literature.
Description: Texto completo: acesso restrito. p.133–137
URI: http://www.repositorio.ufba.br/ri/handle/ri/12397
ISSN: 0003-2670
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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