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Influence of initial iodide concentration on the iodide uptake by the argillite of Tournemire

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Bibliographic Details
Title: Influence of initial iodide concentration on the iodide uptake by the argillite of Tournemire
Authors: Wittebroodt, Charles, Savoye, S., Gouze, P., Michelot, J.L.
Contributors: Aigle, Gm, CCSD, Deleted User
Source: Physics and Chemistry of the Earth, Parts A/B/C. 33:943-948
Publisher Information: Elsevier BV, 2008.
Publication Year: 2008
Subject Terms: sorption, argillite, [PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], diffusion, argillaceous rocks, pore-water, opalinus clay, 01 natural sciences, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment, [SDE.MCG] Environmental Sciences/Global Changes, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, [SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], iodide, 0105 earth and related environmental sciences
Description: Among the radionuclides that can migrate from radioactive wastes buried within consolidated argillaceous rocks, 129I poses a particular problem due to its high mobility in geomedia and its very long half-life of 1.6 107 years. Previous studies carried out on such rocks showed the existence of a low iodide retardation regarding the other anion species. The purpose of the present study was two-fold. It was hoped (1) to confirm this retardation by means of radial diffusion experiments and (2) to estimate the influence of the initial iodide concentrations towards the iodide uptake. The results obtained from in-diffusion stage show that (1) no iodide uptake occurs at high initial concentrations and (2) an uptake at low initial concentrations cannot be clearly evidenced. Finally, the most singular behaviour of iodide was highlighted for all the initial iodide concentrations, from the out-diffusion stage, during which some amount of iodide, available for out-diffusion, were not involved in the diffusion process. Although the origin of such phenomenon remains unclear, a kinetic effect for the iodide uptake was proposed, assuming that the period of 55days (corresponding to the in-diffusion stage duration) would be necessary for inducing the iodide uptake. This kinetic effect, already shown elsewhere by (Descostes, M., Blin, V., Bazer-Bachi, F., Meier, P., Grenut, B., Radwan, J., Schlegel, M.L., Buschaert, S., Coelho, D, Tevissen, E. Diffusion of anionic species in Callovo-Oxfordian argillites and Oxfordian limestones. In press for Appl. Geochem.) on similar materials, needs to be deepened.
Document Type: Article
Conference object
Language: English
ISSN: 1474-7065
DOI: 10.1016/j.pce.2008.05.020
Access URL: https://www.sciencedirect.com/science/article/pii/S1474706508001034
https://hal.archives-ouvertes.fr/hal-00412393
https://ui.adsabs.harvard.edu/abs/2008PCE....33..943W/abstract
https://hal.science/hal-00412132v1
Rights: Elsevier TDM
Accession Number: edsair.doi.dedup.....e5753f5c1b281ae1ea0d8f4ab6b5ce8a
Database: OpenAIRE
Description
Abstract:Among the radionuclides that can migrate from radioactive wastes buried within consolidated argillaceous rocks, 129I poses a particular problem due to its high mobility in geomedia and its very long half-life of 1.6 107 years. Previous studies carried out on such rocks showed the existence of a low iodide retardation regarding the other anion species. The purpose of the present study was two-fold. It was hoped (1) to confirm this retardation by means of radial diffusion experiments and (2) to estimate the influence of the initial iodide concentrations towards the iodide uptake. The results obtained from in-diffusion stage show that (1) no iodide uptake occurs at high initial concentrations and (2) an uptake at low initial concentrations cannot be clearly evidenced. Finally, the most singular behaviour of iodide was highlighted for all the initial iodide concentrations, from the out-diffusion stage, during which some amount of iodide, available for out-diffusion, were not involved in the diffusion process. Although the origin of such phenomenon remains unclear, a kinetic effect for the iodide uptake was proposed, assuming that the period of 55days (corresponding to the in-diffusion stage duration) would be necessary for inducing the iodide uptake. This kinetic effect, already shown elsewhere by (Descostes, M., Blin, V., Bazer-Bachi, F., Meier, P., Grenut, B., Radwan, J., Schlegel, M.L., Buschaert, S., Coelho, D, Tevissen, E. Diffusion of anionic species in Callovo-Oxfordian argillites and Oxfordian limestones. In press for Appl. Geochem.) on similar materials, needs to be deepened.
ISSN:14747065
DOI:10.1016/j.pce.2008.05.020