The effect of water/cosolvent flux, organic matter, pH and cosolvents (acetone and methanol) on the movement of three pesticides (carbofuran, chlorpyrifos and endosulphan) in three different types of soils (sandy loam, loam and silt loam) has been studied by using soil thin-layer chromatographic technique. The movement of the pesticides was expressed in term of frontal RP, RP, RB and RM values. In pure water and cosolvent systems the flux! penetrability was increased by reducing the plate angle. Movement of pesticides was higher in sandy loam soil followed by loam and silt loam soils. Removal of organic matter from the soils increases the movement of pesticides. Similarly with the increase in the volume fractions of both the cosolvents, the movement increases. The movement of pesticides in soils was discussed on the basis of their solubilities in water and cosolvents, polarity, adsorption and solute-solvent interactions.
TLC, movement, pesticides, sail, flux
