Etude de l'influence de la rétention chimique sur la diffusion d'espèces anioniques dans les milieux argileux compacts :

Abstract : Anionic radioisotopes are of particular importance within the framework of the calculated health risk associated with high-level and long-lived intermediate-level underground radioactive waste disposal. Therefore, the objective of this work is the construction of a transport model coupled with chemistry in order to quantify the behaviour of anionic solutes in the Callovo-Oxfordian (COx) argillites, the argillaceous host rock of the ANDRA Meuse/Haute-Marne underground laboratory. An experimental methodology was defined to characterize this migration, several experimental methods being implemented: batch experiments, laboratory columns and through-diffusion cells. The study of the diffusion of the non-sorbing anionic tracer 36Cl- highlighted the fact that, due to anionic exclusion, anions only had access to a part of the porosity. The retention of 35SO42- and 125I- on COx argillites was then characterized, quantified by batch experiments and confirmed by other experimental methods. Nevertheless, their migration was less retarded than expected by a model based on batch experiments and on 36Cl- diffusive data. This difference was explained by anion exclusion which reduced sorption site accessibility. Thus, the intensity of this phenomenon has to be considered to model anion migration in compacted clays
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Frédéric Bazer-Bachi. Etude de l'influence de la rétention chimique sur la diffusion d'espèces anioniques dans les milieux argileux compacts :. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL111N⟩. ⟨tel-01752510⟩

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