Influence of temperature on Pu(IV) extraction from nitric acid solutions into 30% TBP, considered within the framework of A.M. Rozen’s model and of a new (multireaction) model

Abstract

Published and newly obtained data on the influence of temperature on the extraction of Pu(IV) from nitric acid solutions into 30% TBP are analyzed. The analysis shows that both A.M. Rozen’s model and the new (multireaction) model insufficiently accurately describe the influence of temperature on the Pu(IV) extraction at HNO₃ concentrations in the aqueous phase of 1 M and lower, where Pu(IV) can undergo partial hydrolysis, and at HNO₃ concentrations of 4 M and higher. Changes are made in the system of equilibrium constants in both models.