期刊
TALANTA
卷 68, 期 4, 页码 1083-1088出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2005.07.010
关键词
multivariate optimization; Doehlert matrix; iron; zinc; manganese; 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 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. (c) 2005 Elsevier B.V. All rights reserved.
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