期刊
FOOD ANALYTICAL METHODS
卷 10, 期 4, 页码 1007-1015出版社
SPRINGER
DOI: 10.1007/s12161-016-0658-4
关键词
Microwave-assisted digestion; Diluted acid; Multi-element determination; Multivariate analysis; Rice; ICP-MS; ICP OES
资金
- Fundacao de Amparo a Pesquisa do Estado da Bahia (FAPESB, Brazil)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, Brazil)
- Petroleo Brasileiro S. A. (PETROBRAS, Brazil)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES, Brazil)
In this work, microwave-assisted digestion using the diluted nitric acid procedure for trace elements determination in rice samples by inductively coupled plasma optical emission spectrometry (ICP OES) and inductively coupled plasma mass spectrometry (ICP-MS) was investigated in a multivariate way. The response surface methodology (RSM), based on the Box-Behnken design, was employed to obtain the optimum conditions of the significant parameters. The optimal conditions, for 250 mg of sample, could be obtained at a temperature of 200 A degrees C, digestion time of 20 min, and 4.5 mol L-1 for nitric acid concentration. The accuracy of the optimized method was evaluated by analysis of the rice flour certified reference materials (NIST SRM 1568a) and spike recoveries. The results showed good agreement with the reference values of the CRM samples. The analytical method was applied to the determination of Al, As, Ca, Cd, Cu, Fe, K, Mg, Mn, Mo, Se, and Zn in rice samples. Considering some critical parameters such as cost, green chemistry, and analyst safety, the proposed method has advantages compared to classical microwave-assisted digestion procedures based on concentrated acids.
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