Studies on adsorption of carbaryl as influenced by soil organic mauer (SOM) and other soil characteristics

Adsorption of carbaryl (insecticide) has been studied OB soils (untreated) and soils tree of organic matter (O.M.). Freundlich and Langmuir equations are used to characterise the isotherms. Simple correlation analysis shows the significant influnence of organic matter on the adsorption of carbaryl by untreated soils. In case of O.M.-free soils, adsorption is found to be correlated with the clay content and specific surface area. The clay content of the soil (O^.-free) accounts for a very large proportion of the variation in adsorption (k value). Exothermic nature of adsorption illustrates its temperature-dependence. Evaluation of thermodynamic parameters indicates the physical nature of adsorption.