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Multivariate technique for optimization of digestion procedure by focussed microwave system for determination of Mn, Zn and Fe in food samples using FAAS |
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| Authors: | Santelli Ricardo Erthal Bezerra Marcos de Almeida de Santana Otoniel Domingos Cassella Ricardo Jorgensen Ferreira Sérgio Luis Costa |
| Affiliation: | a Universidade Federal Fluminense, Instituto de Química, Outeiro São João Batista, s/n Niterói, 24020-150 Rio de Janeiro, Brazil b Universidade Federal da Bahia, Instituto de Química, Grupo de Pesquisa em Química Analítica, Campus Universitário de Ondina, Salvador, 40170-290 Bahia, Brazil c Universidade Estadual do Sudoeste da Bahia, Departamento de Química e Exatas, Campus de Jequié, Jequié, 45200-190 Bahia, Brazil |
| 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. |
| Keywords: | Multivariate optimization Doehlert matrix Iron Zinc Manganese FAAS |
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