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    Selectivity in the Coextraction of Cation and Anion by Electrochemically Modulated Liquid-Liquid Extraction

    Access Status
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    Authors
    Berduque, A.
    Arrigan, Damien
    Date
    2006
    Type
    Journal Article
    
    Metadata
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    Citation
    Berduque, A. and Arrigan, D. 2006. Selectivity in the Coextraction of Cation and Anion by Electrochemically Modulated Liquid-Liquid Extraction. Analytical Chemistry. 78 (8): pp. 2717-2725.
    Source Title
    Analytical Chemistry
    DOI
    10.1021/ac0521192
    ISSN
    0003-2700
    URI
    http://hdl.handle.net/20.500.11937/22822
    Collection
    • Curtin Research Publications
    Abstract

    Electrochemistry at the interface between two immiscible electrolyte solutions has been presented as a method of electrochemically modulated liquid-liquid extraction, where ions in a mixture can be selectively partitioned as a function of the applied interfacial potential difference. In this study, a mixture comprising 4-octylbenzenesulfonate (4-OBSA-) and tetraethylammonium (TEA+) ions was evaluated. The application of negative potential differences enabled the selective extraction of 4-OBSAinto the organic phase, and more positive potential differences enabled the selective extraction of TEA+. However, intermediate potentials lead to the coextraction of both ions into the organic phase, with apparent selectivity for TEA+ over 4-OBSA-. An increased concentration of either ion in the mixture inhibited the extraction response of the other ion, but the order of the extraction at these intermediate potentials was always TEA+ followed by 4-OBSA-. The reasons for the selectivity for the cation over the anion are discussed.

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