Abstract
The solubility behaviour of uranium(VI) has been studied in a number of waters representative of the pore waters to be expected in candidate repository backfill concretes and also in solutions of calcium and sodium hydroxides. The sorption of uranium has been studied on one of these candidates, a Portland cement with a slag filler. The same cement has been hydrothermally treated to simulate the temperature conditions in the repository and the product used for comparative studies.
The paper describes the experimental measurements and the results. The aqueous concentration of uranium over the uranates formed in the presence of sodium and calcium hydroxides was constant above pH 7 at 3 x 10-6 M. In the concrete pore waters the solubility of uranium was equal to or lower than this value. The distribution coefficient, Rd, for the sorption of uranium onto the slag cement was 2.5 x 10* ml g-1, and was increased by a factor two after hydrothermal treatment.
Similar content being viewed by others
References
Preliminary Environmental and Radiological Assessment and Preliminary Safety Report. UK Nirex Ltd, Nirex Report No.71 (1989)
D E Billington, D A Lever and S J Wisbey, in “Safety Assessment of Radioactive Waste Repositories”, OECD, Paris (1989).
J Paquette and R J Lemire, Nucl. Sci. Eng. 79, 26–48 (1981).
R J Lemire. Atomic Energy of Canada Ltd, Report AECL-9549, (1988).
S M Sharland, P W Tasker and C J Tweed. UKAEA Report AERE-R12442 (1986).
F T Ewart, R M Howse, H P Thomason, S J Williams and J E Cross in “Scientific Basis for Waste Management IX”, Ed. L Werme, Publ. Elsevier, New York (1986).
M J Cooper and D P Hodgkinson. UKAEA Report NSS/R101 (1987).
S Bayliss, F T Ewart, R M Howse, R McCrohon, P Oliver, J L Smith-Briggs and H P Thomason. UKAEA Report NSS/R124 (1989).
D Rai Radiochim. Acta 35 97 (1984).
S Bayliss, F T Ewart, R M Howse, J L Smith-Briggs, H P Thomason and H A Willmott, in “Scientific Basis for Nuclear Waste Management XI”, Ed. M J Apted and R E Westerman, Publ. MRS, Pittsburgh, PA.(1987)
S Bayliss, F T Ewart, R M Howse, S A Lane, N J Pilkington, J L Smith-Briggs and S J Williams, in “Scientific Basis for Nuclear Waste Management XII”, Ed. W Lutze and R C Ewing, Publ. MRS, Pittsburgh, PA.(1988)
M J Angus and F P Glasser in “Scientific Basis for Nuclear Waste Managment IX”, Ed L O. Werme, Publ. MRS Pittsburgh, PA. (1986).
Brown,P.L., HaworthA, Sharland,S.M., Tweed,C.J.: HARPHRQ: An Extension to the Geochemical Modelling Code PHREEQE. UKAEA Report NSS/R188, (1989).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Brownsword, M., Buchan, A.B., Ewart, F.T. et al. The Solubility and Sorption of Uranium (VI) in a Cementitious Repository. MRS Online Proceedings Library 176, 577 (1989). https://doi.org/10.1557/PROC-176-577
Published:
DOI: https://doi.org/10.1557/PROC-176-577