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Diffusion of ionic tracers in the Callovo-Oxfordian clay-rock using the Donnan equilibrium model and the formation factor

Abstract : The transient diffusion of cationic and anionic tracers through clay-rocks is usually modeled with parameters like porosity, tortuosity (and/or constrictivity), sorption coefficients, and anionic exclusion. Recently, a new pore scale model has been developed by Revil and Linde [Revil A. and Linde N. (2006) Chemico-electromechanical coupling in microporous media. J. Colloid Interface Sci. 302, 682–694]. This model is based on a volume-averaging approach of the Nernst–Planck equation. The influence of the electrical diffuse layer is accounted for by a generalized Donnan equilibrium model through the whole connected pore space that is valid for a multicomponent electrolyte. This new model can be used to determine the composition of the pore water of the Callovo-Oxfordian clay-rock, the osmotic efficiency of bentonite as a function of salinity, the osmotic pressure, and the streaming potential coupling coefficient of clay-rocks. This pore scale model is used here to model the transient diffusion of ionic tracers ( 22Na+, 36Cl
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https://hal-insu.archives-ouvertes.fr/insu-00447360
Contributor : Pascale Talour <>
Submitted on : Thursday, January 14, 2010 - 4:51:14 PM
Last modification on : Wednesday, October 14, 2020 - 4:06:18 AM

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D. Jougnot, A. Revil, Philippe Leroy. Diffusion of ionic tracers in the Callovo-Oxfordian clay-rock using the Donnan equilibrium model and the formation factor. Geochimica et Cosmochimica Acta, Elsevier, 2009, 73 (10), pp.2712-2726. ⟨10.1016/j.gca.2009.01.035⟩. ⟨insu-00447360⟩

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