摘要
采用室内模拟试验方法,研究了虱螨脲在3种土壤中的降解、吸附和移动特性。结果表明:25℃下,虱螨脲在江西红壤中的降解半衰期为101d,属于中等降解农药;在太湖水稻土和东北黑土中的降解半衰期分别为74.5d和55.5d,属于较易降解农药。土壤有机质含量是影响虱螨脲降解速率的主要因素;3种土壤对虱螨脲具有较强的吸附性,且土壤有机质含量越高,对虱螨脲的吸附性越强;3种土壤对虱螨脲的吸附自由能变化均小于40kJ·mol-1,属于物理吸附;虱螨脲在土壤中不易移动,正常条件下不会造成地下水的污染。
The degradation, adsorption and migration behavior of lufenuron in three soils were studied in laboratory. The results showed that the degradation half-lives of lufenuron in Jiangxi red soil, Taihu Lake rice soil and Northeast black soil were 101, 74.5 d and 55.5 d, respectively, suggesting that lufenuron was degraded slowly in three soils, and was most slowly degraded in Tiangxi red soil. The effect of soil organic matter content on degradation of lufenuron was the main factor. Lufenuron was easy to be adsorbed by soils, and adsorption of lufenuron was primarily related to soil organic carbon increased. The lufenuron adsorption by soils belonged to physical adsorption with charges of free energy less than 40 kJ·mol^-1. Lufenuron was not easy to migrate in soils and could not cause the pollution of ground water under the normal condition.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第6期1121-1125,共5页
Journal of Agro-Environment Science
关键词
虱螨脲
土壤降解
吸附性
移动性
lufenuron
degradation in soil
adsorption
migration
