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The Dependence of Ionic Diffusion on the Moisture Content of Nonadsorbing Porous Media¹

ABSTRACT

The dependence of the self diffusion coefficient of Rb⁸⁶Cl on the moisture content of packings of 75 and 200µ glass beads was measured. The ordinary diffusion equation was assumed to apply. Diffusion coefficient measurements were made by a transient method. The results indicated a very rapid decrease of diffusivity as the moisture content was decreased. The results are discussed in relation to the path length and moisture content of the medium. An electrical method was used to evaluate the effective path length.

¹ Contribution from the Department of Agronomy, University of Illinois. Published with the approval of the Director of the Illinois Agr. Exp. Sta., Urbana, Ill. Presented before Div. I, Soil Science Society of America, Nov. 13, 1956, at Cincinnati, Ohio.

² Associate Professor of Soil Physics and Assistant in Agronomy, respectively.

Received for publication October 18, 1957. Accepted for publication January 30, 1958.