Regularities of extraction of uranyl thenoyltrifluoroacetonate into a number of solvents

The extraction equilibria were investigated of the thenoyltrifluoroacetone (TTA) chelate of uranyl ion between aqueous perchlorate medium and thirteen organic solvents. The extracted species was shown to be UO₂A₂. The solubility parameter of the chelate was estimated from the partition data and it was confirmed that the relationship lgP _M=n lgP _HA+const. holds for the present system. When the extraction constant (K _ex) is considered in relation to the distribution coefficients, theK _ex values are expected to be constant under certain conditions for all of the solvents; the lgK _ex values were found to be constant (lgK _ex=−2.85±0.17).