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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