麦草畏除草剂厌氧降解可生化性测定

苯环由¹⁴C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¹⁴C标记的CO₂产生;第16天,转化率达91%,出现一种主要的中间代谢产物,有CH₄产生;第27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0.11%.在降解27d中,主要中间代谢产物是3,6-二氯水杨酸,占麦草畏总量的92.04%.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,提供了重要的参考依据.

Degradation of the Herbicide Dicamba under Strictly Anaerobic Conditions

Degradation of the herbicide dicamba was assayed under methane-producing condition using a coastal wetland soil as an inoculum Benzene ring ¹⁴C 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 CO₂ (0.74%) and CH₄ (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