Solute transport properties of compacted Ca-bentonite used in FEBEX project

Garcı́a-Gutiérrez, Miguel; Missana, Tiziana; Mingarro, M.; Samper, Javier; Dai, Zhenxue; Molinero, Jorge

doi:10.1016/s0169-7722(00)00143-1

Cited by 55 publications

(20 citation statements)

References 2 publications

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“…The Gauss-Newton-Levenberg-Marquardt method has been used to minimize the objective function in (5) using the inverse code INVERSE-CORE 2D (Dai and Samper, 1999;. This code can estimate flow and transport parameters and provides statistical measures of goodness-of-fit as well as parameter uncertainties by computing the covariance and correlation matrices, the eigenvalues and approximate confidence intervals (García-Gutiérrez et al, 2001;Dai and Samper, 2004;Samper et al, 2006b).…”

Section: Inverse Problem Of Solute Transport and Sorptionmentioning

confidence: 99%

Normalized sensitivities and parameter identifiability of in situ diffusion experiments on Callovo–Oxfordian clay at Bure site

Samper

Dewonck

Zheng

et al. 2008

Physics and Chemistry of the Earth, Parts A/B/C

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Section: Inverse Problem Of Solute Transport and Sorptionmentioning

confidence: 99%

Normalized sensitivities and parameter identifiability of in situ diffusion experiments on Callovo–Oxfordian clay at Bure site

Samper

Dewonck

Zheng

et al. 2008

Physics and Chemistry of the Earth, Parts A/B/C

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“…Although not a few diffusion data for Se species have been obtained under aerobic and anaerobic conditions, e.g. ; [5][6][7][8] where selenite and selenate species are dominant, data obtained under reducing conditions are limited. 9,10) In particular, D e data for Se(-II) species are scarce.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Modeling Study on Diffusion of Selenium under Variable Bentonite Content and Porewater Salinity

Iida

Yamaguchi

Tanaka

2011

Journal of Nuclear Science and Technology

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Effective diffusion coefficients of selenium through bentonite/sand mixtures were obtained by the through-diffusion method under reducing conditions where selenium was dissolved as HSe À and Se 4 2À . Experiments were carried out under variable bentonite content and porewater salinity. Bentonite contents in bentonite/sand mixtures varied from 20 to 70 wt%. The salinities of experimental solutions varied from 0.05 to 0.5 mol dm À3 , simulating brackish groundwater and seawater. Effective diffusion coefficients were also obtained under anaerobic conditions where the dominant selenium species was determined to be SeO 3 2À . The effective diffusion coefficients of selenium species decreased with increasing bentonite content and with decreasing salinity. This tendency is primarily due to anion exclusion that was caused by the negative surface charge of montmorillonite. A diffusion model for anionic species was developed based on the electric double layer theory and the pore diffusion model, to evaluate the diffusion behaviors of HSe À , Se 4 2À , and SeO 3 2À in bentonite porewater. In this model, pores in bentonite/sand mixtures are assumed to consist of two types of space; one is the space between mineral particles and the other is the space between layers of montmorillonite. The scope of application of this model is limited to less than or equal to 1,600 kg m À3 in dry density. The effective diffusion coefficients of selenium species predicted using this model showed good agreement with experimentally measured ones.

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“…Smectite clays, in particular montmorillonite, are investigated in several countries for their potential use as backfill materials in disposal sites of high-activity radioactive wastes [1][2][3][4]. However, the complexity of the system, its high degree of structural heterogeneity, renders the full interpretation of experimental results rather difficult.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies show a significant difference between diffusion on microscopic scale (motion of the species in the interlayer space) [2,[5][6][7][8] and apparent macroscopic diffusion [4,9,10]. Diffusion on the microscopic scale, obtained from both neutron-scattering studies and microscopic simulations, relates mainly to diffusion between individual clay sheets.…”

Section: Introductionmentioning

confidence: 99%

Study of individual Na-montmorillonite particles size, morphology, and apparent charge

Cadène

Durand-Vidal

Turq

et al. 2005

Journal of Colloid and Interface Science

142

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Solute transport properties of compacted Ca-bentonite used in FEBEX project

Cited by 55 publications

References 2 publications

Normalized sensitivities and parameter identifiability of in situ diffusion experiments on Callovo–Oxfordian clay at Bure site

Normalized sensitivities and parameter identifiability of in situ diffusion experiments on Callovo–Oxfordian clay at Bure site

Experimental and Modeling Study on Diffusion of Selenium under Variable Bentonite Content and Porewater Salinity

Study of individual Na-montmorillonite particles size, morphology, and apparent charge

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