Diffusion and sorption of Cs+, I− and HTO in samples of the argillaceous Wakkanai Formation from the Horonobe URL, Japan: Clay-based modeling approach

Tachi, Yukio; Yotsuji, Kenji; Seida, Yoshimi; Yui, Mikazu

doi:10.1016/j.gca.2011.08.039

Cited by 71 publications

(65 citation statements)

References 61 publications

(123 reference statements)

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“…This is in agreement with laboratory studies on montmorillonite, bentonite and other clay-rich rocks (e.g. Glaus et al 2010;Gimmi and Kosakowski 2011;Tachi et al 2011;Tachi and Yotsuji 2014). The comparably large values may be explained by the so-called surface diffusion of sorbed cations (including cations in the diffuse layer and in interlayers), which leads to an additional driving force for diffusion besides the pore-water gradient (e.g.…”

Section: Cation Diffusion Coefficientssupporting

confidence: 91%

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

et al. 2017

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Transport and retardation parameters of radionuclides, which are needed to perform a safety analysis for a deep geological repository for radioactive waste in a compacted claystone such as Opalinus Clay, must be based on a detailed understanding of the mobility of nuclides at different spatial scales (laboratory, field, geological unit). Thanks to steadily improving experimental designs, similar tracer compositions in different experiments and complementary small laboratory-scale diffusion tests, a unique and large database could be compiled. This paper presents the main findings of 20 years of diffusion and retention experiments at the Mont Terri rock laboratory and their impact on safety analysis.

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Section: Cation Diffusion Coefficientssupporting

confidence: 91%

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

et al. 2017

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“…This tendency was already fully documented in literature in the same Callovo-Oxfordian formation [7,14,16,17,32] but also in other argillaceous rocks [18,21,35]. Melkior et al [17] found that the respective diffusivity of alkaline cations in COx is the following: Cs > Rb > K > Na > Li, as found in the present study.…”

Section: Saturation Effect On Cation Diffusivitysupporting

confidence: 90%

Effect of Water Saturation on the Diffusion/Adsorption of ²²Na and Cesium onto the Callovo-Oxfordian Claystones

et al. 2017

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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 22 Na 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 22 Na and cesium was clearly evidenced onto intact and compacted samples. Under unsaturated conditions, the diffusion behavior for Cs and 22 Na 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.

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“…Tracer concentrations in both reservoirs were monitored continuously until the tracer concentration in the outlet reservoir reached a near linear increase. Multiple curve analysis was then applied to obtain reliable diffusion and sorption parameters ( Tachi et al, 2011). The pH of the solutions was monitored periodically and found to be stable at around 9.5 which is the same as the in-situ condition.…”

Section: Diffusion Experimentsmentioning

confidence: 99%

“…These effects have often been found to have a big impact on effective diffusivities (increased for cations and reduced for anions in comparison with neutral species), and to be strongly dependent on porewater salinity in compacted bentonites (e.g., Eriksen and Jansson, 1996;Glaus et al, 2007Glaus et al, , 2010Kato et al, 1995;Muurinen, 1994; Tachi et al, 2010Van Loon et al, 2007) and argillaceous rocks (e.g., Tachi et al, 2011;Van Loon et al, 2004). These findings cannot be explained by the traditional pore diffusion model, which only considers pore geometry (Van Brakel and Heertjes, 1974).…”

Section: Introductionmentioning

confidence: 99%

Matrix diffusion and sorption of Cs+, Na+, I– and HTO in granodiorite: Laboratory-scale results and their extrapolation to the in situ condition

Tachi

Ebina²,

Takeda³

et al. 2015

Journal of Contaminant Hydrology

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Diffusion and sorption of Cs+, I− and HTO in samples of the argillaceous Wakkanai Formation from the Horonobe URL, Japan: Clay-based modeling approach

Cited by 71 publications

References 61 publications

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

Effect of Water Saturation on the Diffusion/Adsorption of ²²Na and Cesium onto the Callovo-Oxfordian Claystones

Matrix diffusion and sorption of Cs+, Na+, I– and HTO in granodiorite: Laboratory-scale results and their extrapolation to the in situ condition

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Diffusion and sorption of Cs+, I− and HTO in samples of the argillaceous Wakkanai Formation from the Horonobe URL, Japan: Clay-based modeling approach

Cited by 71 publications

References 61 publications

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

Effect of Water Saturation on the Diffusion/Adsorption of 22Na and Cesium onto the Callovo-Oxfordian Claystones

Matrix diffusion and sorption of Cs+, Na+, I– and HTO in granodiorite: Laboratory-scale results and their extrapolation to the in situ condition

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Effect of Water Saturation on the Diffusion/Adsorption of ²²Na and Cesium onto the Callovo-Oxfordian Claystones