增效磷在液相中的光化学降解研究

Photodegradation of SV_1 in Various Solvents

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 .11h,在紫外灯下 ,半衰期分别为 3.59、3.55、6 .0 1h;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 8.2 5、53.32、990 .14h;增效磷在水中光解迅速 ,高压汞灯下的光解半衰期为 0 .33h;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 - 32 2 .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。

The photodegradation of SV 1 in various sovlents under three different light sources was studied. In n hexane, methanol, acetone, acetonitrile and aqueous solutions, the photolytic rates of SV 1 were rapid, The half lives of SV 1 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 SV 1 in acetone is slow. The photolysis of SV 1 in water could be restrained by acetone. The photoquench rate was found distinctly related to quantity of acetone. The photolytic mechanism was also discussed.