醚磺隆在南方三种土壤中的吸附行为

The Adsorption Behavior of Cinosulfuron in Different Soils

采用批量平衡法,研究了除草剂醚磺隆在3种土壤中的吸附行为,探讨了温度和离子强度等因素对吸附的影响。结果表明,醚磺隆在3种土壤中的吸附均为线性吸附,吸附常数Kd为9.883～15.901mL·g-1,且在试验浓度范围内,土壤对醚磺隆的吸附能力随温度的升高和离子强度的增大而增强。

The adsorption of cinosulfuron by three soils and the effects of temperature and ionic strength on the adsorption of cinosulfuron were studied. The results indicated that the sorption equilibration time of cinosulfuron on three soils was 12 h. Adsorption isoterms of cinosulfuron on the three soils were described by Freundlich, Langmuir and linear equation, respectively, but the linear equation showed a better fitness to the adsorption isoterms of cinosulfuron, with the adsorption coefficients Kd being 9.883～15.901 mL·g^-1. The adsorption capability for cinosulfuron on three soils increased with the increase of temperature and ionic strength. Adsorption free energy （AG） of the studied soil was 5.67 kJ .mol 1, showing that the adsorption largely resulted from the physical adsorption. These results implied that cinosulfuron would not pollute groundwater