Abstract
The partition coefficients of europium and thorium extracted from 4 M NaN 3 into 5% (by volume) TBP in a number of diluents have been determined. Using the values of the partition coefficients and of the activity of TBP in the same diluents activity coefficients of the metal complexes in the organic phase have been calculated. It has been shown that both the activity coefficient of the complex in the organic phase and the activity of TBP are related to the solubility parameter of the diluent used. The influence of diluent on the partition coefficient is relatively small since both the activity of TBP and the activity coefficient of the complex change into the same direction with diluent.
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