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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

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

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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.

References

Brown, D. S. and Miller, R. J., (1971) Bentonite instability and its influence on activation energy measurements Soil Sci. Soc. Am. Proc. 35 205–207.CrossRefGoogle Scholar
Cremers, A. and Laudelout, H., (1965) On the “isoconductivity value” of clay gels Soil Sci. 100 298–299.CrossRefGoogle Scholar
Cremers, A. and Laudelout, H., (1966) Surface mobilities of cations in clays Soil Sci. Soe. Am. Proc. 30 570–576.CrossRefGoogle Scholar
Cremers, A. Van Loon, J. and Laudelout, H., (1966) Geometry effects for specific electrical conductance in clays and soils Proc. 14th Nat. Conf. Clays and Clay Minerals 149–162.CrossRefGoogle Scholar
Dakshinamurti, C., (1960) Study on the conductivity of clay systems Soil Sci. 90 302–306.CrossRefGoogle Scholar
Davey, B. G. and Low, P. F., (1968) Clay-water interaction as affected by hydrous aluminum oxide films Trans. 9th Int. Cong. Soil Sci. 1 607–616.Google Scholar
Fripiat, J. J. Jali, A. Poncelet, G. and Andre, J., (1965) Thermodynamic properties of adsorbed water molecules and electrical conduction in montmorillonites and silicates J. Phys. Chem. 69 2185–2197.CrossRefGoogle Scholar
Gast, R. G., (1963) Relative effects of tortuosity, electrostatic attraction and increased viscosity of water on self diffusion rates of cations in bentonite water systems Proc. Int. Clay Conf. 1 251–259.Google Scholar
Gast, R. G., (1966) Applicability of models to predict rates of cation movement in clays Soil Sci. Soc. Am. Proc. 30 48–52.CrossRefGoogle Scholar
Gast, R. G. and Spalding, , (1966) Demonstration of quantitative relationship between activity and diffusion coefficients of Na ion in bentonite-water systems 1 331–339.Google Scholar
Jorgensen, P. and Low, P. F., (1970) Conductance studies of Na-montmorillonite water systems Israel J. Chem. 8 325–333.CrossRefGoogle Scholar
Letey, J. and Klute, A., (1960) Apparent mobility of potassium and chloride ions in soil and clay pastes Soil Sci. 90 259–265.CrossRefGoogle Scholar
Low, P. F., (1958) The apparent mobilities of exchangeable alkali metal cations in bentonite water systems Soil Sci. Soc. Am. Proc. 22 395–398.CrossRefGoogle Scholar
Low, P. F., (1968) Observations on activity and diffusion coefficients in Na-montmorillonite Israel J. Chem. 6 325–336.CrossRefGoogle Scholar
Meredith, R. E. and Tobias, C. W., (1962) Conduction in heterogeneous systems Advances in Electrochemistry and Electrochemical Engineering. 2 15–47.Google Scholar
Sauer, M. C. Jr. Southwick, P. F. Spiegler, K. S. and Wyllie, M. R. J., (1955) Electrical conductance of porous plugs: Ion exchange resin-solution systems Ind. Eng. Chem. 47 2187–2193.CrossRefGoogle Scholar
Shainberg, I. and Kemper, W. D., (1966) Conductance of adsorbed alkali cations in aqueous and alcoholic bentonite pastes Soil Sci. Soc. Am. Proc. 30 700–706.CrossRefGoogle Scholar
Shainberg, I. and Kemper, W. D., (1966) Hydration status of adsorbed cations Soil Sci. Soc. Am. Proc. 30 707–713.CrossRefGoogle Scholar
Shainberg, I. and Kaiserman, A., (1967) Electrochemical potential of NaCl in Na—montmorillonite suspensions Soil Sci. 104 410–415.CrossRefGoogle Scholar
Shainberg, I., (1973) Rate and mechanism of Na-montmorillonite hydrolysis in suspensions Soil Sci. Soc. Am. Proc. 37 689–694.CrossRefGoogle Scholar
Spiegler, K. S. Yoest, R. L. and Wyllie, M. R., (1956) Electric potential across porous plugs and membranes: Ion exchange resin-solution systems Disc. Faraday Soc. 21 174–185.CrossRefGoogle Scholar
van Olphen, H., (1957) Surface conductance of various ion forms of bentonite in water and the electrical double layer J. Phys. Chem. 61 1276–1280.CrossRefGoogle Scholar
van Olphen, H. and Waxman, M. H., (1958) Surface conductance of sodium bentonite in water Proc. 5th Nat. Conf. Clays and Clay Minerals 61–80.Google Scholar
Waxman, M. H. and Smits, L. J. M., (1968) Electrical conductivities in oil-bearing shaly sands Soc. Petrol. Engng. J. 243 107–122.CrossRefGoogle Scholar