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Diffusion of uranium in compacted sodium bentonite |
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| Authors: | Arto Muurinen |
| Institution: | aTechnical Research Centre of Finland, Reactor Laboratory, Otakaari 3 A, SF-02150, Espoo Finland |
| Abstract: | Sorption and diffusion of uranium in sodium bentonite MX-80 were measured in aerobic conditions. The batch method was used for the sorption measurements and the steady state method for the diffusion measurements. Clear sorption was noticed only when high uranium concentrations were used so that the pH of the solution decreased. The diffusivities of uranium were strongly dependent on the compaction of bentonite so that in the highly compacted samples the diffusion was very restricted. Uranium shows both features of ion-exclusion and sorption. Further studies are, however, needed to explain the diffusion mechanisms of uranium. |
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