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Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures

Published online by Cambridge University Press:  27 March 2012

Aku Itälä  and
Arto Muurinen
Aku Itälä
Affiliation:
VTT Technical Research Centre of Finland, Otakaari 3 K, Espoo, FI-02044 VTT, Finland
Arto Muurinen
Affiliation:
VTT Technical Research Centre of Finland, Otakaari 3 K, Espoo, FI-02044 VTT, Finland
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Abstract

The Finnish spent nuclear fuel disposal is based on the Swedish KBS-3 concept in crystalline bedrock. The concept aims at long-term isolation and containment of spent fuel in copper canisters surrounded by bentonite buffer which mostly consists of montmorillonite. For the long-term modelling of the chemical processes in the buffer, the cation-exchange selectivity coefficients have to be known at different temperatures. In this work, the cation-exchange selectivity coefficients and cation-exchange isotherms were determined in batch experiments for montmorillonite at three different temperatures (25 °C, 50 °C and 75 °C). Five different ratios of NaClO4/Ca(ClO4)2 were used in the experimental solutions. After equilibration the solution and montmorillonite were separated and the solution analysed to get the desired exchange parameters. The experiments were modelled with a computational model capable of taking into account the physicochemical processes that take place in the experiment.

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Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-p35
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

1. Pastina, B. and Hellä, P.. Expected evolution of a spent nuclear fuel repository at Olkiluoto. (Posiva Oy, Olkiluoto, Finland, 2006, Posiva Report 2006-05) p. 405.Google Scholar
2. Karnland, O., Olsson, S., Nilsson, U., Mineralogy and sealing properties of various bentonites and smectite-rich clay materials. (Swedish Nuclear Fuel and Waste Management Company, Stockholm, Sweden, 2006) p. 117.Google Scholar
3. TKS-2009. Nuclear Waste Management at Olkiluoto and Loviisa Power Plants. Review of Current Status and Future Plans for 2010-2012. (Posiva Oy, Finland, 2010) p. 563.Google Scholar
4. Tributh, H. and Lagaly, G.A., “Aufbereitung und Identifizierung von Boden- und Lagerstättentonen. I. Aufbereitung der Proben im Labor“. (GIT-Fachzeitzschrift für das Laboratorium 30, 1986) pp. 524–529.Google Scholar
5. Bergaya, F., Theng, B.K.G., Lagaly, G., Handbook of Clay Science. (Elsevier, Oxford, United Kingdom, 2006) p. 1125.Google Scholar
6. Hester, R.E. and Plane, R.A., Inorg. Chem. 3, 769–770 (1964).10.1021/ic50015a037Google Scholar
7. Maes, A., Peigneur, P., and Cremers, A., Proc. Int. Clay Conf. 1975, 319–329.Google Scholar
8. Sposito, G., The thermodynamics of soil solution. (Oxford Univ. Press, Oxford, U.K., 1981) p. 223.Google Scholar
9. Sposito, G., Holtzclaw, K.M., Charlet, L., Jouany, C., and Page, A.L., Soil Sci. Soc. Am. J. 47, 51–56 (1983).10.2136/sssaj1983.03615995004700010010xGoogle Scholar
10. Meier, L., Kahr, G.. Clays and Clay Minerals, Vol. 47, No. 3, 368–388, 1999.10.1346/CCMN.1999.0470315Google Scholar
11. Donnan, F. G., Z. Elektrochemie 17, 572 (1911).Google Scholar
12. Appelo, C. A. J., Postma, D., Geochemistry, groundwater and pollution, 2 nd ed. (A.A. Balkema Publishers, Leiden, Netherlands, 2007) p. 649.Google Scholar
13. Davies, C.W., Ion association. (Butterworth & Co. (Publishers) Ltd. London, 1962) p. 190.Google Scholar
14. Robinson, R.A., Stokes, R.H., Electrolyte solution. The measurement and interpretation of concuctance, chemical potential and diffusion in solution of simple electrolytes , 2 nd ed. (London Butterworths Scientific Publications, 1959) p. 559.Google Scholar
15. Bradbury, M.H., Baeyens, B., Porewater chemistry in compacted re-saturated MX-80 bentonite: Physico-chemical characterisation and geochemical modelling . (PSI Berich Nr. 02-10, Villigen, 2002) p. 42.Google Scholar
16. Bruggenwert, M.G.M., Kamphorst, A., in Developments in Soil Science, edited by Bolt, G.H. (Elsevier Ltd, 1979, Vol. 5, Part B) pp. 141–203.Google Scholar