Solubility of (UO2)3(PO4)2.4H2O in H+-Na+-OH--H2PO-4-HPO2-4-PO3-4-H2O and its Comparison to the Analogous PuO2+2 System
ABSTRACT-The objectives of this study were to address uncertainties in the solubility product of (UO₂)₃(PO₄)₂ · 4H₂O(c) and in the phosphate complexes of U(VI), and more importantly to develop needed thermodynamic data for the Pu(VI)-phosphate system in order to ascertain the extent to which U(VI) and Pu(VI) behave in an analogous fashion. Thus studies were conducted on (UO₂)₃(PO₄)₂ · 4H₂O(c) and (PuO₂)₃(PO₄)₂ · 4H₂O(lc) solubilities for long equilibration periods (up to 870 days) in a wide range of pH values (2.5 to 10.5) at fixed phosphate concentrations of 0.001 and 0.01 M, and in a range of phosphate concentrations (0.0001 to 1.0 M) at fixed pH values of about 3.5. A combination of techniques (XRD, DTA/TG, XAS, and thermodynamic analyses) was used to characterize the reaction products...
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15016891
- Report Number(s):
- PNNL-SA-43126; JSLCAG; KP1301020; TRN: US0503697
- Journal Information:
- Journal of Solution Chemistry, Vol. 34, Issue 4; ISSN 0095-9782
- Country of Publication:
- United States
- Language:
- English
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