Diffusion of ionic tracers in the Callovo-Oxfordian clay-rock using the Donnan equilibrium model and the formation factor - Archive ouverte HAL Access content directly
Journal Articles Geochimica et Cosmochimica Acta Year : 2009

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

(1, 2, 3) , (1, 3) , (4)
1
2
3
4

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
Fichier principal
Vignette du fichier
W5984-MS-di.pdf (593.62 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

insu-00447360 , version 1 (08-03-2021)

Identifiers

Cite

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, 2009, 73 (10), pp.2712-2726. ⟨10.1016/j.gca.2009.01.035⟩. ⟨insu-00447360⟩
97 View
65 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More