The solubility of (UO 2 ) 3 (PO 4 ) 2 · 4H 2 O(s) and the formation of U(VI) phosphate complexes: Their influence in uranium speciation in natural waters

Details The solubility of (UO 2 ) 3 (PO 4 ) 2 · 4H 2 O(s) and the formation of U(VI) phosphate complexes: Their influence in uranium speciation in natural waters The solubility of (UO 2 ) 3 (PO 4 ) 2 · 4H 2 O(s) and the formation of U(VI) phosphate complexes: Their influence in uranium speciation in natural waters

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.4135s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 12, pp.4135-4145

Computer Science

7

Scientific paper

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)-H 3 PO 4 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: (UO 2 ) 3 (PO 4 ) 2 · 4H 2 O(s) Analysis of these data indicates the formation of the predominant species UO 2 HPO 4 (aq) and UO 2 PO - 4 in the pH range 4-9. Their formation constants as well as the solubility constant of (UO 2 ) 3 (PO 4 ) 2 · 4H 2 O(s) have been determined. From the same experiments we have established the equilibrium constant of the hydroxide complex UO 2 (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 [ PO 3- 4 ] T /[ CO 2- 3 ] T is greater than 10 -1 .

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