Hostname: page-component-7479d7b7d-jwnkl Total loading time: 0 Render date: 2024-07-08T11:56:33.206Z Has data issue: false hasContentIssue false
  • English
  • Français

The Solubility of Unirradiated UO2 In Both Perchlorate And Chloride Test Solutions. Influence of the Ionic Medium

Published online by Cambridge University Press:  28 February 2011

M. E. Torrero ,
I. Casas ,
M. Aguilar ,
J. De Pablo ,
J. Gimenez  and
J. Bruno
M. E. Torrero
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
I. Casas
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
M. Aguilar
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
J. De Pablo
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
J. Gimenez
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
J. Bruno
Affiliation:
MBT, Tecnología Ambiental, 08290 Cerdanyola, Spain.
Get access

Abstract

The solubility of a crystalline unirradiated UO2 (s) has been studied under reducing conditions at 25°C in three different ionic media: 0.008 mol dm–3 NaCIO4, 1 and 5 mol dm-3 NaCl+. The species responsible for the solubility in perchlorate medium are U(OH)3 and U(OH)4, with the stability constants log β13 = -0.4(±0.2) and log β14 = -5.7(±0.1), respectively. The solubility in both1! and 5 M chloride media is explained at pH values higher than 6 by the species U(OH)4 with log β14 = -5.5(±0.2) while at lower pH values an abnormal behaviour is observed, with higher uranium concentrations in solution and a proton independent solubility for pH values lower than 4. The XPS observations of the reacted solids do not show the presence of solid surface phases other than uranium dioxide, with an upper oxidation state of UO2.1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 212: Symposium P – Scientific Basis for Nuclear Waste Management XIV , 1990 , 229
Copyright
Copyright © Materials Research Society 1991

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1- Bruno, J. and Sandino, A., Radiochimica Acta 44 /45, 17 (1987)Google Scholar
2- Bruno, J., Casas, I., Lagerman, B. and Munoz, M., Mat. Res. Soc. Symp. Proc. 84, 153 (1987)Google Scholar
3- Rai, D., Felmy, A.R. and Ryan, J.L., Inorg. Chem. 29, 260 (1990)CrossRefGoogle Scholar
4- Parks, G.A. and Pohl, D.C., Geochim. et Cosmochim. Acta 52, 863 (1988)Google Scholar
5- Tremaine, P.R., Chen, J.D., Wallace, G.J. And Boivin, W.A., Journal of Solution Chemistry 10, 3 (1981)Google Scholar
6- Forsyth, R.S., Werme, L.O. and Bruno, J., Journal of Nuclear Materials 138, 1 (1986)Google Scholar
7- Lieser, K.H., Muhlenweg, U. and Sipos-Galiba, I., Radiochimica Acta 39, 35 (1985)Google Scholar
8- Lieser, K.H., Bauscher, Ch. and Nakashima, T., Radiochimica Acta 42, 191 (1987)Google Scholar
9- Magirus, S., Carnall, W.T. and Kim, J.I., Radiochimica Acta 38, 29 (1985)Google Scholar
10- KFK-INE Presentation, Spent Fuel Workshop'90, Hecla Island, Canada, September 1990.Google Scholar
11- Robbins, J.C., Can. Inst. Min. Metall. Bull. 71, 61 (1978)Google Scholar
12- Allen, G.C., Tucker, P.M. and Tyler, J.W., J.Phys.Chem 86, 224 (1982)Google Scholar
13- Sunder, S., Shoesmith, D.W., Bailey, M.G., Stanchell, F.W. and McIntyre, N.S., J.Electroanal. Chem. 130, 163 (1981)Google Scholar
14- Shoesmith, D.W., Sunder, S., Bailey, M.G., Wallace, G.J. and Stanchell, F.W., Applic. of Surf. Sci. 20, 39 (1984)Google Scholar
15- Sunder, S., Boyer, G.D. and Miller, N.H., J. Nuclear Material. In pressGoogle Scholar
16- Bruno, J., Casas, I. and Puigdomenech, I., Radiochim. Acta 44 /45, 11 (1988)CrossRefGoogle Scholar
17- Bruno, J., Casas, I. and Puigdomenech, I.. Geochim. et Cosmochim. Acta. In pressGoogle Scholar
18- Bruno, J., Ferri, D., Grenthe, I. and Salvatore, F., Acta Chem. Scand. A 40, 428 (1986)CrossRefGoogle Scholar
19- Robinson, R.A. and Stokes, R.H., Electrolyte Solutions.(Butterworths, London, 1965)Google Scholar
20- Lemire, R.J. and Tremaine, P.R., J. Chem. Eng. Data 25, 361 (1980)Google Scholar
21- Bruno, J. and Puigdomenech, I., Mat. Res. Soc. Symp. Proc. 127, 887 (1989)Google Scholar
22- Schindler, P., Equilibrium Concepts in Natural Water Systems, Advances in Chemistry Series 67, American Chemical Society. (W.Stumm, Washington DC, 197)Google Scholar
23- Bruno, J., Acta Chem. Scand. 43, 99 (1989)Google Scholar