Abstract
Diffusion transport of 36Cl was examined in seven soils under unsaturated conditions in tubes packed with two portions of each soil having different 36Cl activity concentrations. Apparent diffusion coefficients ( D a) derived from diffusion profiles varied within a narrow range (from 3×10 −10 to 7×10 −10 m 2 s −1) confirming the minor effect of soil properties on the diffusion of a non-reactive radionuclide like 36Cl. Instead, packing conditions had a major effect. Solid–liquid distribution coefficients ( K d) derived from D a (0.02–0.2 L kg −1) were systematically lower than those obtained from batch experiments (0.6–1.0 L kg −1), but with a similar variation pattern among soils. The low values of K d (Cl) confirmed an almost negligible radiochloride–soil interaction.
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