CONTRIBUTION OF ADSORBED STRONTIUM TO ITS SELF-DIFFUSION IN A MOISTURE-SATURATED SOIL

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Abstract
The self-diffusion coefficient of the Sr++ ion in a moisture-saturated soil was measured by following the diffusion of Sr89 into the soil from a well-stirred solution. The soil was in the strontium form and its pores were filled with solutions of SrCl2 of known strength. The plot of (self-diffusion coefficient times total concentration) against the soil solution concentration gives a straight line, to a 1st approximation, from which the relative contributions to the diffusion of ions in the liquid and on the solid can be deduced. Results show that the mobility of ions on the solid is very low and hence very few of these ions can be in a diffuse double layer.

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