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The Determination of the Solubility of Amorphous UO2 (Sn and the Mononuclear Hydrolysis Constants of Uranium(IV) at 25° C.

Published online by Cambridge University Press:  28 February 2011

Jordi Bruno ,
Ignasi Casas ,
Bo Lagerman  and
Maria Munoz
Jordi Bruno
Affiliation:
Deparment of Inorganic Chemistry, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
Ignasi Casas
Affiliation:
Deparment of Inorganic Chemistry, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
Bo Lagerman
Affiliation:
Deparment of Inorganic Chemistry, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
Maria Munoz
Affiliation:
Deparment of Inorganic Chemistry, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

We have measured the solubility 8f amorphous UO2in a wide pH range (2 to 10.5), in 0.5 M NaClO, at T=25 C. The species responsible for the solubility are U(OH) + and U'0H)h, with the stability constants lo:1,3=-1.1± 0.1 and log, 4 =- 5.4_.O. 2, respectively. No evidence for U(OH) is f6und up to pH=10.5. The same model explains satisfactorily the solubility data obtained by Parks and Pohl(5) at T=1000 C., in the pH range 1 to 10. The measured solubility of amorphous UO2 (s) in the pH_ýange 6 to 10.5, under reducing conditions, is rather high,. U(IV) =5 10 mols/l. This is in good agreement with previous data of Gayer and Leider(6) and Galkin and Stepanov(9).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 153
Copyright
Copyright © Materials Research Society 1987

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References

1 - Final Storage of Spent Nuclear Fuel-KBS 3. SKBS/KBS, Stockholm 1983.Google Scholar
2 - Bruno, J., Ferri, D., Grenthe, I. and Salvatore, F., Acta Chem. Scand. In pressGoogle Scholar
3 - Prasud, P.B., Ferri, H.L., Grenthe, I. and Salvatore, F., Econ. Geol. 57, 137 (1962)Google Scholar
4 - Prasud, R., Beasley, H.L. and Milligan, W.O., J. Electromicroscopy (tokio) 16, 101 (1967)Google Scholar
5 - Parks, G.A. and Pohl, D.C.. Hydrotermal Solubility of Uraninite, Report DOE/ER 12016-1, Dec. 1985 Google Scholar
6 - Gayer, K.M. and Leider, H., Can. J. Chem. 35, 5 (1957)Google Scholar
7 - Nikolaeva, N.M. and Pirozhov, A.V., Izv. Sib. Otd. Akad. Nauk. SSSR, Ser. Khim. Nauk., 82 (1987)Google Scholar
8 - Ryan, J.L. and Rai, D., Polyhedron, 2(9), 947 (1983)Google Scholar
9 - Galkin, N.P. and Stepanova, M.A., Soviet Aromic Energy 8, 231 (1961)Google Scholar
10 - Baes, C.F. and Mesmer, R.E., The Hydrolysis of Cations. (Wiley, New York, 1976)Google Scholar
11 - Bruno, J., Casas, I. Grenthe, I. and Lagerman, B.. “The complex formation equilibria in the Th(IV)-H20-CO2 (g) system in 3.0 M NaClO4 at 25°C”. To be published.Google Scholar
12 - Gran, G., Analyst 77, 661 (1952)Google Scholar
13 - Bruno, J., Grenthe, I. and Lagerman, B. in Scientific Basis for Nuclear Waste Management IX, ed. Werme, L.O.. (Mat. Research Soc. Symp. Proceed.) vol. 5 p.299 Google Scholar
14 - Adler, H.H.. Review paper on concepts of uranium-ore formation in reducting enviroments. U.S. Atom. Ener. Comm. Washingtom D.C. IAEA-SM-183/43, p. 141 Google Scholar
15 - Chris, C.M. and Cobble, J.W., J. Am. Chem. Soc. 86, 5385 and 5390 (1964)Google Scholar
16 - Lemire, R.J. and Tremaine, P.R., J. Chem. Eng. Data 25, 361 (1980)Google Scholar
17 - Bruno, J., Casas, I., Grenthe, I. and Lagerman, B., “The complex formation equilibria in the U(IV)-H20-C02 (g) system in 3.0 M NaClO4 at 25°C”. To be published.Google Scholar