The sorption/desorption behavior of carbamate pesticide——aldicarb in soil has been studied with the concentration range of 0—1800 mg/L by multiple cycles of adsorption/desorption experiments.Irreversible sorption of aldicarb was found In all 4 experiments The total sorption amount ( q total ) included two parts:reversible sorption amount ( q rev ) in the labile compartment and irreversible sorption amount ( q irr ) in the irreversibly sorbed compartment.The maximum irreversible adsorpti...