Browsing by Subject "Solvent extraction"

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    Variation of stability constants of thorium and uranium oxalate complexes with ionic strength
    (De Gruyter Oldenbourg, 1994) Erten, H. N.; Mohammed, A. K.; Choppin, G. R.
    The extraction of Th(IV) and UO!+ by a solution of TTA and HDEHP, respectively in toluene has been used to obtain stability constants of their oxalate complexes at 298 Κ in 1, 3, 5, 7 and 9 Μ ionic strength (NaC104) solutions. The complexes formed were the MOx, MHOx, MOx2 and M(HOx)2 (M = Th, U02) species. The values were analyzed by the Specific Interaction Theory and agreed to / < 3 Μ but required an additional term for fitting at / > 3 M.
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    ItemOpen Access
    Variation of stability constants of thorium citrate complexes with ionic strength
    (De Gruyter Oldenbourg, 1996) Choppin, G. R.; Erten, H. N.; Xia, Yuan-Xia
    Citrate is among the organic anions which are expected to be present in the wastes planned for deposition in the WIPP repository. In this study, a solvent extraction method has been used to measure the stability constants of Th(IV) with citrate anions in aqueous solutions with (a) NaClO4 and (b) NaCI as the back-ground electrolytes. The ionic strengths were varied up to 5 m (NaCl) and 14 m (NaClO4). The data from the NaClO4 solutions at varying pH values were used to calculate thermodynamic stability constants through the use of Specific Ion Interaction Theory (SIT).