MOBILITY OF HEAVY METALS AS AFFECTED BY SOME INSECTICIDES THROUGH SOILS, SATURATED WITH DIFFERENT CATIONSSAMIULLAH KHAN AND JMBIR SINGHAbstract The influence of certain insecticides such as endosulfan, dichlorvos and monocrotophos on the mobility of some heavy metals like Cr, Fe, Cu and Ni in soils saturated with different cations e.g. Na4, K', Mg and Ca were measured (in terms of Rf-values) by using soil thin layer chromatography. The mobility order being Cr > Fe > Cu > Ni. The mobility is found to be influenced by the nature and quantity of insecticides application. At lower doses of the insecticides, the mobility of the metals is found to increase and there after a sharp decrease is noticed with the increasing doses of their application. The mobility in various saturated cations systems followed the order of tiaSoil > K-Soil > Mg-Soil > Ca-Soil. The results have been explained on the basis of chemical behaviour of insecticides and metal cations involved in the soil system.
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