Mobiliteit van cadmium in de bodem

<p>The adsorption of cadmium by twelve Dutch soils was investigated under widely varying circumstances. The adsorption can be described with the Freundlich equation; the parameters of this equation can be predicted using the properties of the soil (pH, organic carbon and clay content).</p><p>The adsorption appeared to be sensitive to the ionic strength , complexation, pH, type of anion which is present and competition of calcium ions in the solution. An emperical equation describing the adsorptive factors mentioned before was derived.</p><p>The competition of other heavy metals (Cu, Pb, Zn) appears to be considerable, especially at high metal contents.</p><p>Using the estimated parameters the emperical equation gives a good prediction of the adsorption of cadmium by widely differing soils under varying circumstances.</p><p>Because of the large influence of the solid phase composition and the environmental conditions on the adsorptive behaviour of cadmium one has to be very careful with basing a regulation for cadmium on the total cadmium content of the soil.