Effects of surfactants on the behavior of diazinon in different soils
表面活性剂对二嗪磷在不同土壤中吸附迁移的影响

The effects of three different surfactants (SDBS, Tween-80 and CTAB) on the adsorption and mobility of diazinon were studied in nine soil types, using batch equilibrium experiments and soil thin layer chromatography. The soils had different physical properties and included the six representational soil types in Hunan province. SDBS significantly reduced the adsorption and accelerated the mobility of diazinon in a variety of soils. The adsorption coefficient (Kd) was negatively correlated with the concentration of SDBS while the mobility factors (Rf) were positively correlated with the SDBS concentration. Tween-80 and CTAB had similar effects on the adsorption and mobility of diazinon from 0.1CMC to 2CMC (CTAB 0.80~87.43mg·L-1). In both cases, the Kd and Rf showed positive correlation and negative correlations with the surfactant concentration, respectively. However, the opposite trend appeared from 2CMC to 5CMC (CTAB 87.43~191.60mg·L-1).