Evaluation of Gibbs free energy for the transfer of a highly hydrophilic ion from an acidic aqueous solution to an organic solution based on ion pair extraction |
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Authors: | Yumi YoshidaZenko Yoshida Hisao AoyagiYoshihiro Kitatsuji Akihiro UeharaSorin Kihara |
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Affiliation: | a Department of Chemistry, Kyoto Institute of Technology, Matsugasaki, Sakyoku, Kyoto 606-8585, Japan b Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan |
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Abstract: | A method to determine the standard Gibbs free energy for the transfer, ΔG°tr, of a highly hydrophilic metal ion from an aqueous solution, W, in the presence of high concentration of H+ to an organic solution, O, was proposed based on the theoretical consideration of the distribution process of ions between W and O. The usefulness of the proposed method was verified experimentally by comparing ΔG°tr of Mg2+ determined by the method with that obtained by voltammetry for the ion transfer at the W|O interface. The O examined were nitrobenzene (NB) and 1,2-dichloroethane (DCE). By applying the proposed method, ΔG°tr of NpO2+, UO22+, NpO22+ and PuO22+ from an acidic W to NB were determined. |
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Keywords: | Standard Gibbs free energy for ion transfer Ion pair extraction Aqueous nitrobenzene or 1,2-dichloroethane interface Actinide ions |
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