摘要
高压汞灯下不同物质对水中的苯噻草胺光化学降解的影响研究表明,NO2-和NO3-对苯噻草胺的光解有猝灭作用,其中NO3-在10∶1的添加浓度(质量浓度)下猝灭作用最明显,照光15 min猝灭率达53.3%;卤素离子对苯噻草胺光解有重原子猝灭效应,作用最强的是添加10∶1的I-(质量浓度),照光15min猝灭率达76.9%;4种表面活性剂随添加浓度的增大对苯噻草胺光解的阻滞作用增强,除农乳404在较低添加浓度下(质量浓度比1∶5和1∶1)对苯噻草胺的光解表现出微弱的敏化效应外,其余均表现为猝灭作用;4种除草剂(杀草丹、苄嘧磺隆、甲草胺和绿磺隆)中,只有苄嘧磺隆在低添加浓度(质量浓度比1∶10)时对苯噻草胺有光敏化作用,照光25 min光敏率为18.2%,其余除草剂各添加浓度下均对苯噻草胺表现出光猝灭作用;充氮气10 min,苯噻草胺的光解半衰期由不充氮气的7.14 min缩短为6.70 min.
The study with high-pressure mercury lamp illuminating showed that after illuminated for 15 min, NO2^- and NO3^- quenched the photolysis of mefenacet, and NO3^- with a concentration ratio 10：1 （mass） had the most obvious effect, its quenching rate being up to 53.3 %. Halogen ions inhibited the photolysis of mefenacet by ＂weight atom effect＂, When the concentration ratio of I^- was 10： 1, the quenching rate was 76,9 % after illuminated for 15 min. Surfactants Nongm 500, Nongru 404, Nongru 601 and Nongru 603 had different effects on the photodegradation of mefenacet. At concentration ratios 1 ： 5 and 1 ： 1, only Nongru 404 showed a weak photosensitive effect, while in the other cases, all the four surfactants had photoquenching effects. Among the four herbicides benthiocarb, bensulfuron, alachlor and chlorsulfumn, only bensulfuron at low concentration ratio （ 1 ： 10） accelerated the photolysis of mefenacet, with a photosensitive proportion of 18.2 % after illuminated for 25 min. Aerified N2 could accelerate the photolysis of mefenacet, and the half-life was shortened from 7.14 rain to 6.70 min without aerifying N2.
出处
《应用生态学报》
CAS
CSCD
北大核心
2006年第1期155-158,共4页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(20277001)
安徽省优秀青年科技基金(04041067)资助项目
关键词
苯噻草胺
光解
影响因子
Mefenacet, Photodegradation, Affecting factor,
