Abstract
Abstract Adsorption chracteristics of soils like cation exchange capacity , oxides of Al and Fe, free calcium carbonate, etc, were correlated to the sorption of copper, manganese and zinc in 27 mineral soils. The sorption of these element was followed for 50 days. None of the soil adsorption characteristics studied was significantly correlated to the sorption of Cu and Zn. The soil saturated paste pH and soil suspension pH were strongly correlated to Cu and Zn sorption. The sorption of manganese was significantly correlated to soil adsorption characteristics in the initial stages of this experiment. With the passage of time, the sorption of Mn gradually became mare independent of these parameters. The cation exchange capacity of soils was poorly correlated to Cu, Mn and Zn sorption. The results of this experiment suggest that the guidelines for determining the safe sludge load on soils, which are mainly based on cation exchange capacity, should be revised
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