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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/12783

Title: Multivariate technique for optimization of digestion procedure by focussed microwave system for determination of Mn, Zn and Fe in food samples using FAAS
Other Titles: Talanta
Authors: Bezerra, Marcos de Almeida
Ferreira, Sergio Luis Costa
Santelli, Ricardo Erthal
SantAna, Otoniel Domingos de
Cassella, Ricardo Jorgensen
Keywords: Multivariate optimization;Doehlert matrix;Iron;Zinc;Manganese;FAAS
Issue Date: 2006
Abstract: This article describes the development by response surface methodology (RSM) of a procedure for iron, zinc and manganese determination by flame atomic absorption spectrometry (FAAS) in food samples after digestion employing a focussed microwave system. A Doehlert matrix was used to find optimal conditions for the procedure through response surface study. Three variables (irradiation power and time and composition of oxidant solution—HNO3 + H2O2) were regarded as factors in the optimization study. The working conditions were established as a compromise between optimum values found for each analyte taking into consideration the robustness of the procedure. These values were 12 min, 260 W and 42% (v/v) for irradiation time, irradiation power and percent of H2O2 in solution, respectively. The accuracy of the optimized procedure was evaluated by analysis of certified reference materials and by comparison with a well-established closed vessel microwave dissolution methodology.
URI: http://www.repositorio.ufba.br/ri/handle/ri/12783
ISSN: 0039-9140
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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