Issue 11, 1984

Studies on metal carbonate equilibria. Part 10. A solubility study of the complex formation in the uranium(VI)–water–carbon dioxide (g) system at 25 °C

Abstract

The complex formation in the system UVI–H2O–CO2(g) was studied by measuring the solubility of UO2(CO3)(s) as a function of the CO2 pressure and the hydrogen-ion concentration. The measurements were made at 25 °C, by using two different ionic media, 0.5 and 3 mol dm–3 NaClO4, respectively. The equilibrium constants for the following reactions were determined. Interaction UO2(CO3)(s) UO22++ CO32– Ks,o UO22++tCO32– UO2(CO3)t, t= 1–3 βt,1 3UO22++ 6CO32–[(UO2)3(CO3)6]6–β6,3 coefficients ε(i,j) for the various uranium species with ClO4(or Na+) were determined by using the Brønsted, Guggenheim, Scatchard specific ion-interaction theory. By using these and equilibrium data from the literature, we propose the following set of ‘best’ estimates of equilibrium constants, referred to the pure water reference state: log Ks,o=–14.4 ± 0.1, log β1,1= 9.5 ± 0.2, log β2,1= 16.6 ± 0.2, log β3,1= 21.3 ± 0.2, and log β6,3= 53.4 ± 0.8.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1984, 2439-2443

Studies on metal carbonate equilibria. Part 10. A solubility study of the complex formation in the uranium(VI)–water–carbon dioxide (g) system at 25 °C

I. Grenthe, D. Ferri, F. Salvatore and G. Riccio, J. Chem. Soc., Dalton Trans., 1984, 2439 DOI: 10.1039/DT9840002439

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