摘要
常温条件下 ,用 4 0 0W高压汞灯和太阳光分别照射处理异丙草胺水溶液 ,考察光照和初始浓度对异丙草胺在水溶液中光降解的影响 .研究表明 ,太阳光照射下 ,异丙草胺的光解反应符合一级动力学规律 ,降解速率相对很小 ,在石英试管中 1h的光解率只有 5 5 % ;汞灯照射条件下异丙草胺的光解过程可用双室降解模式来描述 ,1h时的光解率可达 80 9% ;异丙草胺的初始浓度越大 ,其光解率越小 ,降解产物的生成影响异丙草胺本身的光解进程 .运用GC MS技术鉴定出异丙草胺的主要光解产物有 6种 ,光解过程中苯环保持完好 ,并推测了异丙草胺的光解反应机理 .
Propisochlor in water was irradiated at room temperature by a 400W high pressure mercury lamp and sunlight, respectively. Influence of light and initiative concentration of propisochlor on the photolysis were studied. The results showed that under the irradiation of sunlight the photolysis fitted first order kinetics with only 5.5% degradation after one hour's irradiation in the quartz tube, that was a slow rate; while under the irradiation of high pressure mercury lamp the photolysis can be described by a double-chamber model, in which the degradation rate can reach 80.9% after 1h. The higher the initiative concentration of propisochlor was, the slower the photolysis rate became, and the photolysis of propisochlor was influenced by the increasing photo-products. The six main photodegradation products were identified using GC-MS method. The aromatic ring was proved to be intact during the process. And the photolysis mechanism was then assumed on the basis of the photo-products detected.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2003年第5期125-130,共6页
Environmental Science
基金
国家重点基础研究计划前期研究项目(2 0 0 1CCB0 0 70 0 )
关键词
除草剂
异丙草胺
光解动力学
反应机理
herbicide
propisochlor
photolysis
mechanism of reaction
Beynon Table
