Effect of Soil Organic Matter on the Adsorption of Zn, Cu and Mn in Soils

Adsorption of Zn, CU and Mn has been studied in eight soils in presence and ab-sence of organic matter by Langmuir equation and exchange equation. Both the approaches were found to be there liable measures for describing the trace element adsorption. All the soils, in general, showed decrease in the adsorption maximum and selectivity coefficient values for the trace elements after removal of organic matter. Magnitude of reduction in the adsorption maximum and selectivity coefficient was the simple function Of level of organic matter content of the soil. Maximum reduction in adsorption capacities with destruction Of organic matter was obtained for copper and was followed by zinc and manganese in that sequence. Adsorption of trace element resulied in release of proton.