SORPTION PROCESSES IN SOILS AS INFLUENCED BY PORE WATER VELOCITY

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Abstract
The adsorption of ions onto surfaces of soil particles was apparently a 3-step mechanism, namely, diffusion of ions from the bulk solution in the soil pores to a subsurface layer around the soil particles, diffusion across the subsurface layer and finally a surface reaction. Diffusion across the subsurface layer was assumed to be at a constant rate. Adsorption onto the surfaces of soil particles was described by a kinetic reaction at the surface. Based on the assumption that, for adsorbing surfaces that obey the Freundlich isotherm, the activation energies of adsorption and desorption relate to the test of adsorption in a linear manner, the surface reaction process was described mathematically, .**GRAPHIC**. as was the lateral diffusion from the bulk solution to the surfaces of soil particles.
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