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Cadmium soil sorption at low concentrations: III. Prediction and observation of mobility

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Abstract

The applicability of relative solute velocity equations (based on Freundlich isotherm and linear isotherm) for prediction of migration of low concentrations of Cd under intermittent flow conditions was studied by means of eleven small laboratory soil columns monitored for 600 days in terms of Cd breakthrough curves. The predicted Cd velocities (based on previously reported batch experimental results) agreed well with the column observations. The soils studied showed only slightly curvelinear equilibrium isotherms and the use of the Freundlich isotherm based equation in preference for the linear distribution based equation was not justified in this case. The use of the relative solute velocity equations for intermittent flow conditions requires that the relative solute velocity is interpreted as a relative Darcy-velocity and that the water saturated porosity is employed in the equations. The observed relative Cd velocities were 0.0015 to 0.002 indicating a very limited mobility.

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  1. Department of Environmental Engineering, Technical University of Denmark, Bldg. 115, DK-2800, Lyngby, Denmark

    Thomas H. Christensen

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  1. Thomas H. Christensen
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Christensen, T.H. Cadmium soil sorption at low concentrations: III. Prediction and observation of mobility. Water Air Soil Pollut 26, 255–264 (1985). https://doi.org/10.1007/BF00294135

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  • DOI: https://doi.org/10.1007/BF00294135

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