Adsorption and desorption behaviors of triflumezopyrim in five soils

In order to study the adsorption-desorption characteristics of triflumezopyrim in soil, The adsorption- desorption behavior of triflumezopyrim in five soils was studied using batch equilibrium method, and the effects of the environmental factors such as temperature and pH on the adsorption properties of triflumezopyrim were studied. The results showed that the adsorption kinetics of triflumezopyrim in soil was in accordance with the Elovich kinetics model, and the adsorption and desorption isotherms could be well fitted by Freundlich models. The adsorption constants ranged from 1.886 to 7.626. The increase of temperature was more conducive to adsorption, and the adsorption of triflumezopyrim in soil was mainly physical adsorption. With the increase of pH value in the solution, the adsorption capacity of soils to triflumezopyrim decreased gradually. Except that in the clay loam soil in Nanning City(S4), it showed a desorption hysteresis of triflumezopyrim in the five different soils, which indicated that triflumezopyrim is not easy to accumulate in the soil for a long term and has certain migration characteristics.