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Applicability of Models to Predict Rates of Cation Movement in Clays¹

ABSTRACT

Results of electrical conductance and diffusion measurements in dilute bentonite pastes show significant changes in Na⁺ and Sr²⁺ ion mobility on increasing solution or clay concentration. Any useful model to predict rates of cation movement in those systems must allow for these changes in mobility. A three-component model does provide for these changes and appears promising to predict rates of cation movement in systems where the geometry is not affected by varying the electrolyte levels or the nature of the cation species. The use of two-component models to predict rates of cation movement in such systems requires the capability to predict the mobility of exchangeable cations (those cations on the clay) by some independent measurement or fundamental property of the system. Exchangeable cation mobility did not vary in Na- and Sr-kaolinite systems with increasing electrolyte levels. Two-component models could be used to predict rates of cation movement in these systems provided the geometry factor and mobility of exchangeable cations is known.

¹ Published with the permission of the Director of the University of Tennessee Agricultural Experiment Station, Knoxville. The work was done at the Agricultural Research Laboratory of the University of Tennessee, Oak Ridge, Tenn., which is operated by the Tennessee Agricultural Experiment Station for the US Atomic Energy Commission under Contract No. AT-40-1-GEN-242.

² Associate Professor, Univ. of Tennessee.

Received for publication June 1, 1965. Accepted for publication October 28, 1965.