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Article Dans Une Revue Physics and Chemistry of the Earth. Parts A/B/C Année : 2006

Characterization of iodide retention on Callovo-Oxfordian argillites and its influence on iodide migration

Résumé

Iodine-129 is commonly considered to belong to the largest contributors to the calculated impact on health associated with the longterm nuclear underground waste disposal. Its behaviour in Callovo-Oxfordian argillites, an argillaceous host rock studied by ANDRA, therefore must be fully characterized. Investigated cores have been extracted from a place outside the Meuse/Haute Marne underground laboratory. Thus, batch and through-diffusion experiments were performed to investigate iodide sorption and transport, on two different test samples. Batch experiments give evidence of a kinetically limited slight retention of iodide at low total iodine concentration. This sorption, dependent on the oxic/anoxic conditions, has been modelled with an initial quick reaction and a long-term steady loss of iodide from the solution. Through-diffusion experiments have confirmed this retention but to a lower extent than observed in batch experiments and differences were found between both samples. These differences have been explained by anionic exclusion, which potentially blocks sorption site access.

Dates et versions

hal-00284063 , version 1 (02-06-2008)

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F. Bazer-Bachi, E. Tevissen, M. Descotes, B. Grenut, P. Meier, et al.. Characterization of iodide retention on Callovo-Oxfordian argillites and its influence on iodide migration. Physics and Chemistry of the Earth. Parts A/B/C, 2006, 31 (Issue 10-14), pp.497-654. ⟨10.1016/j.pce.2006.04.015⟩. ⟨hal-00284063⟩
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