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Feasibility of Dispersive Liquid–Liquid Microextraction for Molybdenum Determination in Lamb Meat by MIP OES

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Abstract

The dispersive liquid–liquid microextraction (DLLME) was evaluated as a strategy to improve the MIP OES sensitivity for molybdenum determination in lamb meat. Initially, the dispersive (methanol) and extracting (tetrachloromethane) solvents were selected based on a mixture design. The best results were achieved with methanol and carbon tetrachloride as dispersive and extracting solvent, respectively. The operational parameters, such as pH, volume of dispersive and extractant solvents, and complexing agent concentration (8-hydroxyquinoline) were optimized using a Box-Behnken design. The optimal conditions were established as pH 3.8, 90 μL of carbon tetrachloride, 480 μL of methanol, and 1.09 mmol L-1 of 8-hydroxyquinoline. Besides, the use of external gas module control (EGCM) was explored to minimize the matrix effects caused by the organic solvent introduction. The accuracy of the proposed method was estimated employing a certificate reference material (bovine liver, NIST 1577c) and the obtained recovery was 92%. The limit of detection was found to be 0.20 μg g-1, and the enrichment factor was 4.5. The DLLME-MIP OES was applied for six samples of lamb meat, and the results compared to ICP-MS presented no statistical difference. Therefore, the proposed method showed satisfactory accuracy and suitable sensitivity.

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Acknowledgments

This is a contribution of the National Institute of Advanced Analytical Science and Technology (INCTAA).

Funding

This study was funded by the Fundação de Amparo a Pesquisa do Estado de São Paulo - Fapesp (grant number 2018/26145-9), Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq (grants number 153125/2016-0, 141315/2017-2, and 308178/2018-1), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brazil (Finance Code 001).

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Correspondence to Ana Rita A. Nogueira.

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Ana Beatriz Santos Silva declares that she has no conflict of interest. Ívero Pita de Sá declares that he has no conflict of interest. Julymar Marcano de Higuera declares that she has no conflict of interest. Ana Rita de Araujo Nogueira declares that she has no conflict of interest.

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Silva, A.B.S., Sá, Í.P., Higuera, J.M. et al. Feasibility of Dispersive Liquid–Liquid Microextraction for Molybdenum Determination in Lamb Meat by MIP OES. Food Anal. Methods 14, 496–502 (2021). https://doi.org/10.1007/s12161-020-01898-x

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  • DOI: https://doi.org/10.1007/s12161-020-01898-x

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