麦草畏除草剂厌氧降解可生化性测定

Degradation of the Herbicide Dicamba under Strictly Anaerobic Conditions

苯环由14 C标记合成的麦草畏除草剂 ,厌氧降解反应至第 7天 ,转化率达 64 % ,有14 C标记的CO2 产生 ;第1 6天 ,转化率达 91 % ,出现一种主要的中间代谢产物 ,有CH4 产生 ;第 2 7天 ,转化率达 95% ,仍然只有一种主要的中间代谢产物 .麦草畏苯环的断裂量仅占总量的 2 96% ,转化成CO2 的为 0 74 % ,转化成CH4 的为 0 1 1 % .在降解 2 7d中 ,主要中间代谢产物是 3 ,6 二氯水杨酸 ,占麦草畏总量的 92 0 4 % .3 ,6 二氯水杨酸的苯环没有被打开 ,可生化性极低 ,仍然继续污染环境 .研究结果为控制麦草畏对人体健康危害 ,进行生物修复工程 。

Degradation of the herbicide dicamba was assayed under methane\|producing condition using a coastal wetland soil as an inoculum Benzene ring 14 C labeled dicamba was employed and degradative process proceeds through demethoxylation yielding 3,6 dichlorosalicylic acid as the predominant intermediate The data showed that the degradation rate of dicamba by the enrichment culture achieved 64%, 91% and 95% after 7, 16 and 27 days of incubation, respectively; only small quantities of CO 2 (0 74%) and CH 4 (0 11%) were recovered with insignificant radioactivity The benzene ring of dicamba was not cleavaged to a significant extent Future cleaning up of dicamba contaminated environment may require an effective bioremediation techniques