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Published in Soil Sci Soc Am J 30:438-442 (1966)
© 1966 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Electrochemical Determination of Diffusion Coefficients in Clay-Water Systems1

Raphael S. Mokady and Philip F. Low2

ABSTRACT

Pastes containing different concentrations of MCl (M = Li or Na) were prepared by mixing MCl olutions with M-montmorillonites. The pastes were used in pairs in which the members differed only in NaCl activity. Initially, a Ag-AgCl electrode and an M-sensitive glass electrode were inserted into each paste and the emf between them was measured. Then the members of each pair were brought into contact with Ag-AgCl electrodes inserted in them. The emf's between the latter electrodes were also measured. From the two kinds of emf measurements the transference numbers of the ions in the different pairs were calculated. These transference numbers, along with the measured electrical conductances of the pastes, were used to calculate the ionic mobilities. Finally, the calculated ionic mobilities and the known ionic concentrations were inserted in the Nernst equation to calculate the diffusion coefficients of the respective salts

NOTES

1 Journal paper no. 2708, Purdue University Agr. Exp. Sta. Lafayette, Ind., Contribution from the Department of Agronomyl This research was supported by grants from the Div. of Agr. Development, Tennessee Valley Authority and the International Atomic Energy Agency.

2 Post-doctoral Fellow and Professor of Agronomy, respectively. The first-named author is now at the Soil Science Laboratory, Israel Institute of Technology, Haifa, Israel.

Received for publication January 14, 1966. Accepted for publication March 4, 1966.






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