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Monosegmented Flow Analysis Exploiting Aqueous Two-phase Systems for the Determination of Cobalt

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Abstract

An environmentally safe procedure has been developed for the extraction, separation and determination of metal ions using a monosegmented flow analysis technique that exploits an aqueous two-phase system (ATPS-MSFA). The ATPS-MSFA method was applied for the determination of cobalt, based on the reaction between Co(II) and KSCN, which produces a metallic complex that spontaneously partitions to the top phase of the ATPS composed of poly(ethylene oxide), ammonium sulfate and water. The linear range was 5.00 to 500 μmol kg−1 (R = 0.9998; n = 13) with a coefficient of variation equal to 1.14% (n = 7). The method yielded a limit of detection and a limit of quantification of 2.17 and 7.24 μmol kg−1, respectively. The ATPS-MSFA method was applied to the determination of cobalt in a nickel-cadmium battery sample and the results were validity with flame atomic absorption spectrometry using addition standard.

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Authors and Affiliations

  1. Grupo de Química Verde Coloidal e Macromolecular, Departamento de Química, Centro de Ciências Exatas e Tecnológicas, Universidade Federal de Viçosa, Av. P.H. Rolfs s/n, 36560-000, Viçosa, MG, Brazil

    Guilherme Dias Rodrigues, Leandro Rodrigues de Lemos, Luis Henrique Mendes da Silva & Maria C. Hespanhol da Silva

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  1. Guilherme Dias Rodrigues
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  2. Leandro Rodrigues de Lemos
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  3. Luis Henrique Mendes da Silva
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  4. Maria C. Hespanhol da Silva
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Correspondence to Maria C. Hespanhol da Silva.

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Rodrigues, G.D., de Lemos, L.R., da Silva, L.H.M. et al. Monosegmented Flow Analysis Exploiting Aqueous Two-phase Systems for the Determination of Cobalt. ANAL. SCI. 28, 1213–1218 (2012). https://doi.org/10.2116/analsci.28.1213

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  • DOI: https://doi.org/10.2116/analsci.28.1213

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