Talanta

Autor: Bezerra, Marcos de Almeida, Ferreira, Sergio Luis Costa, Santelli, Ricardo Erthal, SantAna, Otoniel Domingos de, Cassella, Ricardo Jorgensen
Jazyk: angličtina
Rok vydání: 2006
Předmět:
Zdroj: Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA
ISSN: 0039-9140
DOI: 10.1016/j.talanta.2005.07.010
Popis: Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2013-08-29T17:36:58Z No. of bitstreams: 1 1-s2.0-S003991400500425X-main.pdf: 130367 bytes, checksum: bd1be907f807836b6186956ddc42a799 (MD5) Made available in DSpace on 2013-08-29T17:36:59Z (GMT). No. of bitstreams: 1 1-s2.0-S003991400500425X-main.pdf: 130367 bytes, checksum: bd1be907f807836b6186956ddc42a799 (MD5) Previous issue date: 2006 Texto completo: acesso restrito.p.1083–1088 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.
Databáze: OpenAIRE
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