NDLI: Solubility of (UO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O in H$^{+}$-Na$^{+}$-OH$^{−}$-H$_{2}$PO$^{−}$$_{4}$-HPO$^{2−}$$_{4}$-PO$^{3−}$$_{4}$-H$_{2}$O and Its Comparison to the Analogous PuO$^{2 +}$$

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Solubility of (UO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O in H$^{+}$-Na$^{+}$-OH$^{−}$-H$_{2}$PO$^{−}$$_{4}$-HPO$^{2−}$$_{4}$-PO$^{3−}$$_{4}$-H$_{2}$O and Its Comparison to the Analogous PuO$^{2 +}$$_{2}$ System

Journal of Solution Chemistry : Volume 34, Issue 3, March 2005

Journal of Solution Chemistry : Volume 34, Issue 2, February 2005

Journal of Solution Chemistry : Volume 34, Issue 1, January 2005

Journal of Solution Chemistry : Volume 33

Journal of Solution Chemistry : Volume 32

Journal of Solution Chemistry : Volume 31

Journal of Solution Chemistry : Volume 30

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Journal of Solution Chemistry : Volume 26

Solubility of (UO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O in H$^{+}$-Na$^{+}$-OH$^{−}$-H$_{2}$PO$^{−}$$_{4}$-HPO$^{2−}$$_{4}$-PO$^{3−}$$_{4}$-H$_{2}$O and Its Comparison to the Analogous PuO$^{2 +}$$_{2}$ System

Content Provider	Springer Nature Link
Author	Rai, Dhanpat Xia, Yuanxian Rao, Linfeng Hess, Nancy J. Felmy, Andrew R. Moore, Dean A. McCready, David E.
Copyright Year	2005
Abstract	The objectives of this study were to address uncertainties in the solubility product of (UO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O(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 (UO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O(c) and (PuO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O(am) 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 (0.0001–1.0 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. The U(VI)-phosphate data for the most part agree closely with thermodynamic data presented in Guillaumont et al.,$^{(1)}$ although we cannot verify the existence of several U(VI) hydrolyses and phosphate species and we find the reported value for formation constant of UO$_{2}$PO$^{−}$$_{4}$ is in error by more than two orders of magnitude. A comprehensive thermodynamic model for (PuO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O(am) solubility in the H$^{+}$-Na$^{+}$-OH$^{−}$-Cl$^{−}$-H$_{2}$PO$^{−}$$_{4}$-HPO$^{2−}$$_{4}$-PO$^{3−}$$_{4}$-H$_{2}$O system, previously unavailable, is presented and the data shows that the U(VI)-phosphate system is an excellent analog for the Pu(VI)-phosphate system.
Starting Page	469
Ending Page	498
Page Count	30
File Format	PDF
ISSN	00959782
Journal	Journal of Solution Chemistry
Volume Number	34
Issue Number	4
e-ISSN	15728927
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2005-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermodynamic data solubility product (PuO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O(am) (UO$_{2}$)$_{3}$(PO$_{4}$)$_{2}$⋅4H$_{2}$O(c) U(VI) phosphate complexes Pu(VI) phosphate complexes Inorganic Chemistry Physical Chemistry Industrial Chemistry/Chemical Engineering Geochemistry Oceanography Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Biochemistry Molecular Biology Biophysics Physical and Theoretical Chemistry

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