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- W2062872699 abstract "Uranium is commonly associated in natural waters with O-containing ligands both in the aqueous and the solid phases. Phosphate is present in most of these systems; however, the thermodynamics of the U(VI)-H3PO4 system are poorly known, particularly in the pH range of interest 6 to 9. Hence, the effect of phosphate on the migration of uranium in natural waters is not well understood. We have investigated the solubility of a well-characterized U (VI)-phosphate phase in the pH range 3 to 9: (UO2)3(PO4)2 · 4H2O(s) Analysis of these data indicates the formation of the predominant species UO2HPO4(aq) and UO2PO−4 in the pH range 4–9. Their formation constants as well as the solubility constant of (UO2)3(PO4)2 · 4H2O(s) have been determined. From the same experiments we have established the equilibrium constant of the hydroxide complex UO2(OH)3−. A discussion of the hydrolysis of U (VI) is also reported. The effect of phosphate on the mobility of U in natural waters is assessed in the light of these new data. They indicate that in the pH range of most natural waters, 6 to 9, U (VI) will be associated to aqueous phosphate complexes when the total concentration ratio [PO3−4]T[CO2−3]T is greater than 10−1." @default.
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- W2062872699 date "1992-12-01" @default.
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- W2062872699 title "The solubility of (UO2)3(PO4)2 · 4H2O(s) and the formation of U(VI) phosphate complexes: Their influence in uranium speciation in natural waters" @default.
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- W2062872699 doi "https://doi.org/10.1016/0016-7037(92)90256-i" @default.
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