甲基对硫磷对三种拟除虫菊酯杀虫剂的光敏降解研究

本文以高压汞灯和自然阳光为光源，研究了甲基对硫磷对氧氰菊酯、溴氰菊酯和氰茂菊酯在玻片表面光致降解的影响。结果表明：甲基对硫磷与三种拟除虫菊酯农药混合照光处理后，可使拟除虫菊酯农药的光解速度加快。氯氰菊酯、氰戊菊酯和溴氰菊酯的光解半衰期，在高压汞灯下比其单独照光分别缩短１２．１８、８．４６和７．３３倍，在阳光下则分别缩短４．７３，２．６５，和４．４６倍。甲基对硫磷对三种拟除虫菊酯农药表现出显著的光敏

THE PHOTOSENSITIVE EFFECTS OF PARATHION-METHYL ON THE PHOTODEGRADATION OF THREE PYRETHROID INSECTICIDES

The effects of parathion-methyl on photolytic rates of cypermethrin, deltamethrin, and fenvalerate on glass were studied with 150W high pressure mercury lamp or under sunlight. The results showed that by mixing with parathion-methyl, the photolytic rates of three pyrethroids were accelerated significantly; and the half-life of cypermethrin, fenvalerate, and deltamethrin were shortened by 12. 18, 8. 46, and 7. 53 times respectively under high pressure mercury lamp,and by 4. 73. 2. 56,and 4. 56 times respectively under sunlight. There was significant positive correlation between the dosage of parathion-methyl and the photosensitive efficiency.