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Soil Science Society of America Journal Abstract -

Applicability of Models to Predict Rates of Cation Movement in Clays1


This article in SSSAJ

  1. Vol. 30 No. 1, p. 48-52
    Received: June 1, 1965
    Accepted: Oct 28, 1965

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  1. R. G. Gast2



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.

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