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Electrical Conductivity of Na—Montmorillonite Suspensions

Published online by Cambridge University Press:  01 July 2024

I. Shainberg  and
Rachel Levy
I. Shainberg
Affiliation:
Institute of Soils and Water. A.R.O., Volcani Center, Bet Dagan, Israel
Rachel Levy
Affiliation:
Institute of Soils and Water. A.R.O., Volcani Center, Bet Dagan, Israel
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Abstract

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The electrical conductivity of Na-montmorillonite suspensions in various salt and clay concentrations was measured. The weight conductance of the clay suspension was found to decrease with increase in clay concentration between 0 and approximately 0·5 g clay/100 ml, then rose to a plateau at 6–10 g clay/100 ml. The weight conductance of the clay suspensions also increased with an increase in the salt solution concentration. If the model of two resistors in parallel is used in interpreting the experimental data, these changes can be attributed to an increase in the mobility of the adsorbed Na ions. It is proposed that the two resistors in series model is more realistic in describing the conductivity of the suspensions. This model predicts the observed weight conductance changes of the suspensions, while the mobility of the adsorbed ions remains constant. A constant mobility of the adsorbed Na ions in clay-water systems of low to medium salt and clay concentrations also is predicted by the diffuse double layer.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 3 , June 1975 , pp. 205 - 210
Copyright
Copyright © 1975, The Clay Minerals Society

Footnotes

*

Contribution from the Institute of Soils and Water, A.R.O., Volcani Center, Bet Dagan, Israel. 1974 Series, No. 123-E. Part of the work was done at the Agronomy Department, Purdue University, West Lafayette, Indiana, U.S.A.

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