The complexation of plutonium(IV) with sulfate at variable temperatures from 25o C to 55o C has been investigated by solvent extraction method. A NaBrO3 as holding oxidant was used to maintain plutonium in the Pu(IV) oxidation state throughout the experiments. The distribution ratio of Pu(IV) between the organic and aqueous phases was found to decrease as the concentrations of sulfate were increased. Stability constants of the 1:1 and 1:2 Pu(IV)-HSO4- complexes, dominant in the aqueous phase under the experimental conditions, were calculated from the effect of [HSO4-] on the distribution ratio. The enthalpy and entropy of complexation were calculated from the stability constants at different temperatures by using the Van’t Hoff equation.
Revised: December 27, 2007 |
Published: October 1, 2007
Citation
Xia Y., J.I. Friese, D.A. Moore, P.P. Bachelor, and L. Rao. 2007.Complexation of Plutonium (IV) with Sulfate at Variable Temperatures.Journal of Radioanalytical and Nuclear Chemistry 274, no. 1:79-86.PNNL-SA-50625.doi:10.1007/s10967-006-6907-z