ABSTRACT -The formation of a solid solution can significantly affect the solubility of a minor component. The objectives of this study were to determine the nature of U(IV) and Np(IV) solid solutions and their thermodynamic properties. For this purpose, co-precipitates of U(IV) and Np(IV) [(UxNp1-x )O2(am), with values for x of 0.95, 0.85, 0.50, 0.15, and 0.05] were prepared, characterized, and used to determine their solubility as a function of K2CO3 concentrations ranging from 1.0 m to 5.0 m in the presence of 0.01 m Na2S2O4 and 0.01 m KOH, and as a function of KHCO3 concentrations ranging from 0.1 m to 0.8 m in the presence of 0.01 m Na2S2O4. The solubility data show that the equilibrium in these systems is reached in
Revised: August 13, 2010 |
Published: March 15, 2004
Citation
Rai D., N.J. Hess, M. Yui, A.R. Felmy, and D.A. Moore. 2004.THERMODYNAMICS AND SOLUBILITY OF (UxNp1-x)O2(am) SOLID SOLUTION IN THE CARBONATE SYSTEM.Radiochimica Acta 92, no. 9-11:527-535.PNNL-SA-39912.doi:10.1524/ract.92.9.527.54995