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Microwave-Assisted Digestion Using Diluted Nitric Acid for Multi-element Determination in Rice by ICP OES and ICP-MS

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Abstract

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 °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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Acknowledgments

The authors are grateful to the Fundação de Amparo a Pesquisa do Estado da Bahia (FAPESB, Brazil), the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil), Petróleo Brasileiro S. A. (PETROBRAS, Brazil), and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) for providing grants, fellowships, and financial support.

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal da Bahia, Campus de Ondina, Salvador, Bahia, 40170-115, Brazil

    Taiana B. Tarantino, Isa S. Barbosa, Leonardo S. G. Teixeira & Maria Graças A. Korn

  2. Departamento de Exatas e Tecnológicas, Universidade Estadual de Santa Cruz, Ilhéus, Bahia, Brazil

    Daniel de C. Lima

  3. Departamento de Ciências Exatas e da Terra, Universidade do Estado da Bahia, Salvador, BA, Brazil

    Madson de G. Pereira

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  1. Taiana B. Tarantino
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  2. Isa S. Barbosa
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  3. Daniel de C. Lima
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  4. Madson de G. Pereira
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  5. Leonardo S. G. Teixeira
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  6. Maria Graças A. Korn
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Correspondence to Maria Graças A. Korn.

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Taiana B. Tarantino declares that he has no conflict of interest. Isa S. Barbosa declares that he has no conflict of interest. Daniel de C. Lima declares that she has no conflict of interest. Madson de G. Pereira declares that he has no conflict of interest. Leonardo S. G. Teixeira declares that he has no conflict of interest. Maria Graças A. Korn declares that he has no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Tarantino, T.B., Barbosa, I.S., de C. Lima, D. et al. Microwave-Assisted Digestion Using Diluted Nitric Acid for Multi-element Determination in Rice by ICP OES and ICP-MS. Food Anal. Methods 10, 1007–1015 (2017). https://doi.org/10.1007/s12161-016-0658-4

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  • DOI: https://doi.org/10.1007/s12161-016-0658-4

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