Multivariate technique for optimization of digestion procedure by focussed microwave system for determination of Mn, Zn and Fe in food samples using FAAS

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 cond...

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Bibliographic Details
Published in:Talanta (Oxford) 2006-02, Vol.68 (4), p.1083-1088
Main Authors: Santelli, Ricardo Erthal, Bezerra, Marcos de Almeida, de SantAna, Otoniel Domingos, Cassella, Ricardo Jorgensen, Ferreira, Sérgio Luis Costa
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Doehlert matrix
Exact sciences and technology
FAAS
Iron
Manganese
Multivariate optimization
Spectrometric and optical methods
Zinc
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Summary: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—HNO 3 + H 2O 2) 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 H 2O 2 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.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2005.07.010