Organic phosphates, phosphonates, phosphinates and phosphine oxides are compared as solvents for uranium and plutonium nitrates. Distribution coefficients for U(VI) and Pu(IV) and (VI) indicate a large difference in solvent strength among these groups of compounds. The introduction of an electronegative group greatly reduces the solvent strength. The P-0 stretching frequency can be correlated with solvent strength for these compounds. Some solid complexes of the organophosphorus compounds with uranyl nitrate have been isolated.

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Appendix A -Thermal Behavior of and Evolved.Gases from 2 and 10 Mass% TOC Mixtures of Acetate, Citrate, EDTA, and HEDTA and Equimolar Sodium Nitrate and Nitrite as Measured by DSC, TGA, ARC, and IR . . . .

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Tributyl Phosphate and Its Diluent Systems One factor which makes tributyl phosphate one of the most important solvents for processing nuclear fuels is its chemical stability. However, degradation reactions give butyl acid phosphates which may react with metal ions being separated (2) and must, therefore, be kept at low concentrations. Because radiation damage may lead to similar products, radiolysis, not only of pure