Abstract
The role of temperature on the distribution of Am3+ and UO2 2+ was investigated in the extraction systems involving TBP and DOSO as the neutral oxodonors and picrate as the organophilic counter anion. The inner-sphere water molecules and their substitution by the oxodonor molecules appeared to influence the extraction constants of these metal ions. The conditional extraction constants for Am3+ were found to be larger (about 3 order of magnitude) than those for UO2 2+. From the thermodynamics data it appeared that both TBP as well as DOSO bind Am3+ ion through outer-sphere coordination. In presence of 1M NaCl, though the interaction with TBP remains unaltered DOSO tend to form an inner-sphere complex. On the other hand, UO2 2+ forms inner-sphere complexes with DOSO and outer-sphere complex with TBP in the absence of salt. In the presence of 1M NaCl, both TBP and DOSO form inner-sphere complexes. The effect of ionic strength on metal ion extraction was also investigated.
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P. K. Mohapatra, V. K. Manchanda, Talanta, to be published.
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For Part I see Ref. 9.
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Mohapatra, P.K., Manchanda, V.K. The unusual extraction behavior of americium(III) and dioxouranium(VI) from picric acid medium using neutral oxodonors II. A thermodynamic study. J Radioanal Nucl Chem 240, 159–164 (1999). https://doi.org/10.1007/BF02349149
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DOI: https://doi.org/10.1007/BF02349149