Phase diagram of uranyl acetate-water-tri-n-butyl phosphate system in the region of high salt concentrations

The results of investigations into mutual solubility in the system of uranyl acetate-water-tributyl phosphate (the range of high salt concentrations) at 25 deg C are presented. The phase diagram of the system in the solubility range is shown to differ sharply from the most of diagrams of the known systems of salt-water-tributyl phosphate. An attempt is made to associate the unusual character of the solubility isotherm with change of the role of water in extraction and dissolution processes at transition from halogenoacetates to uranyl acetate. Based on IR spectroscopic data the conclusion is made on uranyl acetate solvation in the organic phase only with one molecule of tributyl phosphate, but not two molecules, as it was considered earlier