增效磷在液相中的光化学降解研究

Photodegradation of SV1 in Various Solvents

摘要: 研究了增效磷在正己烷、甲醇、乙腈、丙酮及水溶液中以及在不同光源下的光化学降解, 结果表明: 在正己烷、甲醇、乙腈溶液中, 增效磷降解效应显著, 在汞灯下的半衰期分别为0. 98、1. 54、2. 11 h, 在紫外灯下, 半衰期分别为3. 59、3. 55、6. 01 h; 增效磷在丙酮溶剂中降解缓慢, 三种光源下的半衰期分别为8. 25、53. 32、990. 14 h; 增效磷在水中光解迅速, 高压汞灯下的光解半衰期为0. 33 h; 丙酮对增效磷在水中的光解有极显著的猝灭作用, 猝灭效率与丙酮的量具有显著的相关性, 猝灭效率最高达- 322. 34%。对反应体系的吸收光谱测定结果表明,增效磷在液相中的光解差异与吸收光谱的改变有一定程度的相关性。

Abstract: The photodegradation of SV1 in various sovlents under three different light sources was studied. In n hexane, methanol, acetone, acetonitrile and aqueous solutions, the photolytic rates of SV1 were rapid, The half lives of SV1 were 0.98 h, 1.56 h, 2.11 h and 0.33 h respectively under high pressure mercury lamp. It was found that the photolytic rate of SV1in acetone is slow. The photolysis of SV1 in water could be restrained by acetone. The photoquench rate was found distinctly related to quantity of acetone. The photolytic mechanism was also discussed.