Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones
The diffusion and adsorption behaviors of sodium and cesium were investigated in the Callovo-Oxfordian claystones (France) under unsaturated conditions. Through-, out-, and in-diffusion laboratory experiments were performed on intact and compacted samples. These samples were partially saturated usin...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2017/1683979 |
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| author | Sébastien Savoye Serge Lefevre Agnès Fayette Jean-Charles Robinet |
| author_facet | Sébastien Savoye Serge Lefevre Agnès Fayette Jean-Charles Robinet |
| author_sort | Sébastien Savoye |
| collection | DOAJ |
| description | The diffusion and adsorption behaviors of sodium and cesium were investigated in the Callovo-Oxfordian claystones (France) under unsaturated conditions. Through-, out-, and in-diffusion laboratory experiments were performed on intact and compacted samples. These samples were partially saturated using an osmotic method for imposed suction up to 9 MPa. This specific technique enabled us to obtain water saturation degree ranging from 81% to 100% for intact samples and from 70% to 100% for compacted materials. The results showed a very low impact of water saturation on the extent of adsorption for 22Na and cesium, onto intact and compacted materials. Such observations suggest that the saturation degrees were not low enough to limit the access of cations to adsorption sites on clay surfaces. At full saturation, enhanced diffusion for 22Na and cesium was clearly evidenced onto intact and compacted samples. Under unsaturated conditions, the diffusion behavior for Cs and 22Na was not only slower but also distinct as compared to fully saturated samples. For the intact rock and under suction of 1.9 MPa, the Cs diffusivity was reduced by a factor of 17, whereas for sodium, it was reduced by a factor of 5. Explanation was then proposed to explain such a difference. |
| format | Article |
| id | doaj-art-e24469e0938347748ea190f8ed9da398 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
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| series | Geofluids |
| spelling | doaj-art-e24469e0938347748ea190f8ed9da3982025-02-03T01:24:30ZengWileyGeofluids1468-81151468-81232017-01-01201710.1155/2017/16839791683979Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian ClaystonesSébastien Savoye0Serge Lefevre1Agnès Fayette2Jean-Charles Robinet3DEN-Service d’Etude du Comportement des Radionucléides (SECR), CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceDEN-Service d’Etude du Comportement des Radionucléides (SECR), CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceDEN-Service d’Etude du Comportement des Radionucléides (SECR), CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceR&D Division, Transfer Unit, Andra, 92298 Châtenay-Malabry, FranceThe diffusion and adsorption behaviors of sodium and cesium were investigated in the Callovo-Oxfordian claystones (France) under unsaturated conditions. Through-, out-, and in-diffusion laboratory experiments were performed on intact and compacted samples. These samples were partially saturated using an osmotic method for imposed suction up to 9 MPa. This specific technique enabled us to obtain water saturation degree ranging from 81% to 100% for intact samples and from 70% to 100% for compacted materials. The results showed a very low impact of water saturation on the extent of adsorption for 22Na and cesium, onto intact and compacted materials. Such observations suggest that the saturation degrees were not low enough to limit the access of cations to adsorption sites on clay surfaces. At full saturation, enhanced diffusion for 22Na and cesium was clearly evidenced onto intact and compacted samples. Under unsaturated conditions, the diffusion behavior for Cs and 22Na was not only slower but also distinct as compared to fully saturated samples. For the intact rock and under suction of 1.9 MPa, the Cs diffusivity was reduced by a factor of 17, whereas for sodium, it was reduced by a factor of 5. Explanation was then proposed to explain such a difference.http://dx.doi.org/10.1155/2017/1683979 |
| spellingShingle | Sébastien Savoye Serge Lefevre Agnès Fayette Jean-Charles Robinet Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones Geofluids |
| title | Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones |
| title_full | Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones |
| title_fullStr | Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones |
| title_full_unstemmed | Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones |
| title_short | Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones |
| title_sort | effect of water saturation on the diffusion adsorption of 22na and cesium onto the callovo oxfordian claystones |
| url | http://dx.doi.org/10.1155/2017/1683979 |
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