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Coupling Phenomena in Saturated Homo-ionic Montmorillonite: II. Theoretical¹

ABSTRACT

A theory is presented for the formulation of flux equations which describe the transport of water, salt, and electric charge through clays. This theory is based on thermodynamic principles. Model considerations lead to analytical expressions for the transport coefficients. These model calculations are based on electric double layer theory and produce a symmetric matrix of coefficients.

The difference with former theories and model calculations is that the analysis is for electrodes which are reversible to the anions instead of the cations. The impact of this difference on the magnitude of some of the coefficients and on some of the physico-chemical responses of the system is formidable.

¹ Contribution from the Dep. of Land Resource Science, Univ. of Guelph, Guelph, Ontario, Canada. The authors acknowledge support from the National Research Council of Canada.

² Professional Associate and Professor, respectively.

Received for publication August 12, 1975. Accepted for publication August 2, 1976.