Diffusion in Saturated Soil. II: Results for Compacted Clay
Publication: Journal of Geotechnical Engineering
Volume 117, Issue 3
Abstract
The effective diffusion coefficients, of three anions ( and three cations and diffusing in two compacted clay soils, kaolinite and Lufkin clay, are measured. The ions are contained in a simulated waste leachate. The effects of molding water content and method of compaction on the measured values are evaluated for kaolinite. The calculated values varied between and and, based on the results for chloride diffusion in kaolinite, are relatively insensitive to molding water content and compaction method. The measured values for and in kaolinite are in excellent agreement with previous studies, but the values for the cations are relatively high. High values for the cations are attributed to nonlinear adsorption behavior at relatively high concentrations and to the possibility of chemical precipitation of the heavy metal species ( and Also, values determined from reservoir concentrations typically are higher than values determined from soil concentration profiles.
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Copyright © 1991 ASCE.
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Published online: Mar 1, 1991
Published in print: Mar 1991
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