摘要
光敏剂亚甲兰、核黄素及玫瑰红 B可加速氯氰菊酯 (CPM)的光解作用。这些物质的敏化作用主要通过激发基态氧为单线态氧来实现。光敏剂和氧均是敏化光降解不可缺少的条件。 1 / Kexptl与 [A]的关系证实了单线态氧氧化机理。在亚甲兰、核黄素存在下氯氰菊酯 KA 分别为 6.49× 1 0 6L·mol-1· s-1和 2 .2 7× 1 0 6L· mol-1· s-1。氯氰菊酯的光解速率在一定范围内 ,随光敏剂浓度的增加而增加 ,过量的光敏剂将减少体系的透光率而导致氯氰菊酯光解速率降低。单线态氧探针性物质即竞争反应的引入将明显降低氯氰菊酯的光解速率 ,同时 。
The mechanism of sensitized photolysis of cypermethrin is 1O 2 exited from 3O 2 by the addition of sensitizers. The relationship between 1/ K exptl and [CPM] confirms the mechanism of singlet oxygen. Values of K A of CPM with the exist of methylene and riboflavin is 6.49×10 -6 L·mol -1 ·s -1 and 2.27×10 -6 L·mol -1 ·s -1 , respectively. Concentration of sensitizer, probe reagent of 1O 2 and solvent with different polarity can effect the sensitized photolysis of CPM.
出处
《分析科学学报》
CAS
CSCD
2000年第6期450-455,共6页
Journal of Analytical Science
