摘要：AbstractAround two millennia ago agrochemicals were introduced to enhance crop quality and quantity. Later on these pesticides were found to cause undesired environmental effects mainly contamination of water bodies and soil. Therefore it became necessary to study and understand the environmental behavior of pesticides. In the present study adsorption and desorption of benzoylphenylurea insecticide, Chlorfluazuron was investigated for 4 different types of soils (clay, Sandy clay loam, Sandy loam and Sandy clay). These 4 types of soils were collected from 10 different agricultural areas of Pakistan. The physiochemical properties of selected soil samples were analyzed according to standard test method (STM), and then their sorption study was investigated through batch equilibrium method involving UV–Visible spectrophotometer and HPLC techniques. The sorption data was fitted well into the Freundlich and linear equation. The Freundlich adsorption coefficients (Kf ads) ranged from 3.9 to 9.05 µg ml−1and distribution adsorption coefficients (Kd ads) ranged from 4.7 to 12.0 µg ml−1suggesting that chlorfluazuron was weakly adsorbed on the tested soils. The Freundlich desorption coefficients (Kf des) varied from 1.23 to 8.9 µg ml−1, and distribution desorption coefficients (Kd des) ranged from 4.09 to 9.2 µg ml−1indicating that chlorfluazuron tend to be leached from soils thus there is significant potential for surface and groundwater contamination of tested soil samples with chlorfluazuron. These results were further confirmed by leachability/mobility index KOM, which classified chlorfluazuron in highly mobile group of pesticides.
