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A New Simple and Fast Method for Determination of Cobalt in Vitamin B12 and Water Samples Using Dispersive Liquid-Liquid Microextraction and Digital Image Analysis

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Abstract

In this work, a simple and fast method for the determination of cobalt in vitamin B12 and water samples was developed. The procedure is based on the preconcentration of the element using dispersive liquid-liquid microextraction (DLLME) and subsequent detection by digital image colorimetry. DLLME was performed with trichloroethylene (extraction solvent) and ethanol (dispersive solvent). The element was extracted in the form of its complex with 2-(2-thiazolylazo)-p-cresol (TAC). The optimal working conditions were obtained through univariate optimization. The variables studied were pH, the volume of extraction solvent, and the volume of dispersive solvent. Under optimal conditions, the method presented a limit of detection of 0.9 μg L−1 and precision (relative standard deviation) of 4.0%, for 25.0 μg L−1 cobalt solutions. The procedure was applied to the determination of cobalt in vitamin B12 and water samples. The method presents a simple, fast, and low-cost procedure, presenting itself as an excellent alternative to the determination of cobalt in the samples analyzed.

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Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. The authors also received financial support from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (311419/2018-6) and the Fundação de Amparo à Pesquisa do Estado da Bahia.

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Authors and Affiliations

  1. Laboratório de Química Analítica, Universidade Estadual do Sudoeste da Bahia, Campus de Jequié, Jequie, Bahia, 45208-091, Brazil

    Valfredo Azevedo Lemos, Ivanilson Vieira Souza Junior, Luana Bastos Santos & Jeferson Alves Barreto

  2. Programa de Pós-Graduação em Química, Universidade Federal da Bahia, Campus Universitário de Ondina, Salvador, Bahia, 40170-280, Brazil

    Valfredo Azevedo Lemos, Luana Bastos Santos & Sérgio Luís Costa Ferreira

  3. Departamento de Química Analítica, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Niteroi, Rio de Janeiro, 24020-141, Brazil

    Jeferson Alves Barreto

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  1. Valfredo Azevedo Lemos
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  2. Ivanilson Vieira Souza Junior
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  3. Luana Bastos Santos
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  4. Jeferson Alves Barreto
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  5. Sérgio Luís Costa Ferreira
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Correspondence to Valfredo Azevedo Lemos.

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Lemos, V.A., Junior, I.V.S., Santos, L.B. et al. A New Simple and Fast Method for Determination of Cobalt in Vitamin B12 and Water Samples Using Dispersive Liquid-Liquid Microextraction and Digital Image Analysis. Water Air Soil Pollut 231, 334 (2020). https://doi.org/10.1007/s11270-020-04680-1

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