Obtaining reliable thermodynamic data for Pu(V) is difficult because of its redox and/or disproportionation reactions in most aqueous systems. The known stability of Pu(V) in PuO2(am) suspensions in slightly acidic to near neutral conditions was used to study the solubility of PuO2(am) in 0.4 and 4.0 M NaCl or NaClO4 solutions ranging in pcH+ values from 4 to 9 as a function of time. The close agreement between the observed solubility and the predicted solubility using Pitzer ion-interaction parameters of Np(V) with Cl- or ClO4- for Pu(V) indicates that Pu(V), as expected, behaves in an analogous fashion to Np(V) and confirms the value of using Np(V) data to model Pu(V) behavior.
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