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Ionic Diffusion Coefficients as Predicted by Conductometric Techniques¹

ABSTRACT

Ion diffusion coefficients were determined for Na, Ca, and Cl in three soils under various moisture regimes. The Nernst-Einstein equation was used in conjunction with bulk soil specific electrical conductivity data to obtain the diffusion coefficient values. The conductivity data were measured in special cells designed to control both solution composition and moisture content. The contribution of both the solution and the surface phases to the total diffusivity of each ion was estimated. The ion diffusion coefficient values were corrected for the nonideality of system. Anion repulsion corrections were also made to account for the surface contribution to Cl diffusion.

¹ Journal paper no. 3320 of the Utah State Agric. Exp. Stn., Utah State Univ., Logan, UT 84322.

² Professor, Dep. of Soil Science and Biometeorology, Utah State Univ., former Graduate Assistant, and Assistant Professor, Dep. of Soil Science and Biometeorology, Utah State Univ., respectively.

Received for publication September 5, 1986.

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