Sorption and movement of pesticides related to physical-chemical properties of "cerrados" soils from the state of São Paulo

Abstract

By using radiometric techniques, sorption and movement of the insecticides aldrin, DDT, lindane, malathion, parathion and the fungicide carbendazim were determined in laboratory in seven soils from the "cerrado" of the State of São Paulo. Aldrin and DDT were more sorbed by all soils. Soil thin-layer chromatography experiments showed that aldrin and DDT exhibited also the lowest R_f indicating that they are less mobile. The relationship between sorption of pesticide and physical-chemical characteristics of soils was determined by linear correlation analysis. These studies demonstrated significant correlation between sorption coefficient of aldrin, lindane, malathion, parathion and the organic matter content of soils. High significant correlation was also found between sorption coefficient of aldrin, malathion, parathion and clay content.