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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/5287

Title: Slurry sampling and high-resolution continuum source flame atomic absorption spectrometry using secondary lines for the determination of Ca and Mg in dairy products
Other Titles: Microchemical journal
Authors: Brandão, Geovani Cardoso
Matos, Geraldo D.
Ferreira, Sergio Luis Costa
Keywords: Slurry sampling;High-resolution continuum source flame;High-resolution continuum source flame atomic absorption spectrometry;Secondary lines;Calcium;Magnesium;Dairy products
Issue Date: Jul-2011
Abstract: The present paper proposes a simple and fast analytical procedure for the sequential multi-element determination of Ca and Mg in dairy products employing sampling slurry and high resolution-continuum source flame atomic absorption spectrometry (HR-CS FAAS). Considering the high concentration of these species in these matrices, the analytical measurements were carried out at the secondary lines of 239.856 and 202.852 for Ca and Mg, respectively. The experimental conditions established for the preparation of the slurries during the optimization step were: 2.0 mol L−1 hydrochloric acid, sonication time of 20 min and sample mass of 1.0 g for a slurry volume of 25 mL. Experiments demonstrated that the analytical curves can be established using the external calibration technique employing aqueous standards. The method allows the determination of Ca and Mg with limits of quantification of 0.038 and 0.016 mg g−1, respectively. The precision was evaluated under reproducibility and repeatability conditions and expressed as relative standard deviation. The results varied from 2.7 to 2.9% (all tests with n=10) and using a yogurt sample containing Ca and Mg concentrations of 1.40 and 0.13 mg g−1, respectively. The accuracy was confirmed by the analysis of a certified reference material of non-fat milk powder furnished by the National Institute of Standard and Technology. The proposed method was applied for the determination of Ca and Mg in yogurt, cow milk and milk powder samples. The samples were also analyzed after complete acid digestion and Ca and Mg determination by HR-CS FAAS. No statistical difference was observed between the results obtained by both of the procedures performed.
Description: Texto completo: Acesso Restrito.p. 231–233.
URI: http://www.repositorio.ufba.br/ri/handle/ri/5287
ISSN: 0026-265X
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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