Hostname: page-component-84b7d79bbc-fnpn6 Total loading time: 0 Render date: 2024-07-31T20:22:42.688Z Has data issue: false hasContentIssue false
  • English
  • Français

Diffusion Mecflanisms of Srrontium and Cesium in Compacrtd Sodium Bentonite

Published online by Cambridge University Press:  28 February 2011

Armo Muurinen ,
Pirkkd Penitä-Hiltunen  and
Juba Rantanen
Armo Muurinen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory Otakaari 3 A, SF-02150 Espoo, Finland
Pirkkd Penitä-Hiltunen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory Otakaari 3 A, SF-02150 Espoo, Finland
Juba Rantanen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory Otakaari 3 A, SF-02150 Espoo, Finland
Get access

Abstract

In this research the diffusion of strontium and cesium through bento- nite slabs in stationary state has been measured. The measurement gives directly the transport through the sample and the corresponding effective diffusivity. The apparent diffusivity, diffusivity of the sorbed ions as well as the sorption factors can also be evaluated on the basis of the same diffusion measurement. The sorption on the coxmpacted bentonite has also been measured in a special sorption test where a radioactive tracer has been allowed to diffuse into compacted bentonite until equilibrium was reached.

The measured effective diffusivities were clearly higher than they would be in the case of pure pore diffusion. The effective diffusivities also increase with K and the apparent diffusivities are almost independent on KD. This supports the theory that also the sorbed ions diffuse in their own phase. The sorption factors of the compacted bentonite correspond to the values of the batch experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 803
Copyright
Copyright © Materials Research Society 1987

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

1. Neretnieks, I., Diffusivities of some dissolved constituents in campacted wet bentonite clay -MX8O and the impact on radionuclide migration in the buffer, KBS-TR-82-27, Stockholm 1982.Google Scholar
2. Torstenfelt, B., Allard, B., Anderson, K., Kipatsi, H., Eliasson, L., Olofsson, U., Persson, H., Radionuclide diffusion and mobilities in compacted bentonite, KBS-TR-83-34, Stockholm 1983.Google Scholar
3. Eriksen, T.E., Jacobsson, A., Diffusion in clay - Experimental techniques and theoretical models, KBS-TR-84-05, Stockholm 1984.Google Scholar
4. Soudek, A., Jahnke, F.M., Ion-Exchange Equilibration and Diffusion in Engineered Backfill, NUREG/CP-0052, CONF-8308126---, 1984, pp. 172–203.Google Scholar
5. Jahnke, F.M., Badhe, C.J., Electrolyte Diffusion in Ccupacted Montmorillonite E~ngineered Barriers. Proceeding of the International Symposium on Coupled Processes Affecting the Performance of a Nuclear Waste Repository, September 18-20, 1985.Google Scholar
6. Basmusson, A., Neretnieks, I., Surface migration in sorption processs, KBS-TR-83-87, Stockholm 1983.Google Scholar
7. Muurinen, A., Rantanen, J., Pettild-Hiltunen, P., In Scientific Basis for Nuclear Waste Manegement IX, (Publishers Choice Book Mfg. Co., 1986) pp. 617–624.Google Scholar
8. Crank, J., The mathematics of diffusion. Oxford University Press, London 1956.Google Scholar
9. SKBF/KBS, Final Storage of Spent Nuclear Fuel - KBS-3, Part IV, Stockholm, 1983, p. 20:12.Google Scholar