论文部分内容阅读
为了解氯溴虫腈在土壤中的转化归趋,开展了其在土壤中的降解、吸附、迁移等环境行为研究。结果表明:氯溴虫腈在东北黑土、北京黄棕土、山西棕土中的降解半衰期分别为19.8d、24.8d和21.0d,属于易降解农药。氯溴虫腈在3种土壤中的吸附规律符合Freundlich吸附等温线方程,有机碳吸附常数(Koc)均大于20000。氯溴虫腈东北黑土和北京黄棕土中的Rf值分别为0.125和0.25,在山西棕土中山西棕土的R_f值为0.5。氯溴虫腈在北京黄棕土和东北黑土中表现为易土壤吸附,不易移动,在山西棕土中表现为易土壤吸附,中等移动。
In order to understand the transformation of chlorfenapyr in soil, the study of its degradation, adsorption and migration in soil has been carried out. The results showed that the degradation half-lives of chlorfenapyr in Northeast black soil, Beijing yellow brown soil and Shanxi brown soil were 19.8d, 24.8d and 21.0d, respectively, which belonged to easily biodegradable pesticides. The adsorption of chlorfenapyr in three soils accords with the Freundlich adsorption isotherm equation, and the adsorption coefficient of organic carbon (Koc) is more than 20000. The Rf values of chlorfenaprid in northeast black soil and Beijing yellow brown soil were 0.125 and 0.25, respectively, and the Rf value of west brown soil in Shanxi brown soil was 0.5. Chlorfenaprid in Beijing yellow brown earth and northeast black soil showed easy soil adsorption, not easy to move, in Shanxi brown soil showed easy soil adsorption, moderate migration.