Abstract
The influence of the polarity of diluents on the extraction of plutonium (IV) complexes from nitric acid solution with tri-n-butylphosphate, di-n-butylphosphate, thenoyltrifluoroacetone, tetra-n-butylammoniumnitrate and methylisobutylketone has been examined. Diluents such as carbon tetrachloride, chloroform, benzene, cyclohexane, n-heptane, bromoform and dibromoethane have been used singly and in mixtures. Evidence is presented for the importance of the dipole moment of the diluent in the extraction process in connection both with the structure of the organic phase and dipole-dipole interaction promoting solvation of the Pu-complex. Maxima exist in the extraction of Pu-TBAN complexes to phases containing mixtures of polar diluents with non-polar diluents and in particular with benzene.
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