噁草酮在液相中的光化学降解研究

Photodegradation of Oxadiazon in Various Solvents

以高压汞灯为光源 ,研究了草酮在环己烷、甲醇、乙腈、丙酮及水溶液中的光化学降解。结果表明 :在环己烷、甲醇、乙腈、水中 ,草酮光降解效应显著 ,其半衰期分别为 4 .4 5、15 .34、5 7.5 8、5 4.6 9min;草酮在丙酮溶剂中降解缓慢 ,半衰期为 2 93.83min;丙酮对草酮在水中的光解有显著的光敏作用 ,光敏效应与丙酮的量显著相关 ,光敏效率最高达 95 .84 %。

Under the high pressure mercury lamp,the photodegradation of oxadiazon in different solvents was studied. In cyclohexane, methanol, actonitrile and distilled water, the photolytic rate was rapid, the half life of oxadiazon was 4.45, 15.34, 57.58 and 54.69 min. But the photolytic rate in acetone was slow; its half life was 293.83 min. The photolysis of oxadiazon in water could be activated by acetone. The photoactive rate was found distinctly related to quantity of acetone.