三氟苯嘧啶在5种土壤中的吸附与解吸附行为

为研究三氟苯嘧啶的吸附-解吸附特性，采用振荡平衡法研究了三氟苯嘧啶在采集于吉林通化、江苏扬州、江西萍乡、广西南宁和海南海口等地的5种土壤中的吸附-解吸附行为及其环境影响因素。结果表明:三氟苯嘧啶在土壤中的吸附动力学符合Elovich模型，吸附和解吸附等温线符合Freundlich模型，吸附常数在1.886~7.626。温度的升高更有利于吸附，土壤对三氟苯嘧啶的吸附主要是物理吸附；随着溶液中pH值的升高，土壤对三氟苯嘧啶的吸附能力逐渐下降。除广西南宁黏壤土外，三氟苯嘧啶在5种土壤中的解吸附过程中存在滞后现象，不易在土壤中长期积累，具有一定的迁移特性。

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.