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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/5822

Title: Application of multivariate optimization in the development of an ultrasound-assisted extraction procedure for multielemental determination in bean seeds samples using ICP OES
Other Titles: Microchemical Journal
Authors: Santos, Wagna Piler Carvalho
Castro, Jacira Teixeira
Bezerra, Marcos de Almeida
Fernandes, Andréa Pires
Ferreira, Sergio Luis Costa
Korn, Maria das Graças Andrade
Keywords: Box–Behnken design;Mixture design;Ultra-sonic extraction;Bean;Elemental composition;ICP OES
Issue Date: 2009
Abstract: In this paper, multivariate optimization was applied for the development of an ultrasound-assisted multielemental extraction procedure for analysis of bean samples by inductively coupled plasma optical emission spectrometry. For this procedure, powdered samples were treated with an acid mixture and submitted to ultrasound energy for extracting the target elements (Ba, Ca, Cu, Fe, K, Mg, Mn, Sr and Zn). Centroid simplex mixture design was used for optimize the acid proportions (nitric, acetic and chloride acid)and Box Behnken design was applied for optimize the process variables (particle size, final concentration of extracting solution and sonication time) after mixture optimization. Iron had not presented quantitative extractions and it was excluded from final samples analysis. The developed method presents the follow limits of quantification in μg g−1: Ba (0.90); Ca (5.2); Cu (4.0); K (0.90); Mg (1.4); Mn (0.22); Sr (0.25) and Zn (4.0). Accuracy was accessed by comparison of determined concentration with the values obtained by the microwave digestion procedure. The proposed method was applied toward the determination of elemental composition in bean samples collected in the country zone from Jequié city located on the Bahia State, Brazil.The trace elements content ranged from 0.21 to 3.04, 3.84 to 10.8, 0.60 to 5.23, 31.0 to 46.5 and 10.8 to 19.6 μg g−1 Ba, Cu, Sr, Zn, Mn, respectively. The major elements content ranged from 0.0418 to 0.0877, 0.109 to 0.153 and 1.30 to 1.56% (w/w) Ca, Mg and K, respectively.
Description: Acesso restrito: Texto completo. p. 153-158
URI: http://www.repositorio.ufba.br/ri/handle/ri/5822
ISSN: 0026-265X
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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