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以５００Ｗ中压汞灯为光源，对２１种苯甲腈类化合物在水溶液中的光化学降解（下简称光解）进行了研究。结果表明，该类化合物的光解符合一级动力学反应方程，半衰期均小于３５ｍｉｎ。实验证明存在基态电荷转移络合物（ＣｈａｒｇｅＴｒａｎｓｆｅｒＣｏｍｐｌｅｘ，下简称ＣＴＣ），并认为是引起光氧化反应的重要因素。苯环上斥电子取代基、腐殖酸、一些无机盐、酸性或碱性介质、温度等均能加快反应，但吸电子取代基会减慢反应、本文还以日光为光源对几种苯甲腈类化合物在天然水中进行了光解研究，表明光解速率较慢，推测反应主要是水中可溶解有机物（下简称ＤＯＭ）的光敏化所致。
The photochemical degradation of 21 benzonitrile compounds in aqueous solution was studied with 500W medium pressure mercury lamp as light source. The results show that the photodegradation of these compounds conforms to the first-order kinetic reaction equation, and the half-lives are all less than 35min. Experiments show that there is a ground state charge transfer complex (ChargeTransferComplex, referred to as CTC), and that is an important factor in photo-oxidation. Phenanthrene on the electronic repellent substituents, humic acid, some inorganic salts, acidic or alkaline media, temperature, etc. can speed up the reaction, but the electron-withdrawing substituent will slow down the reaction, The photolysis of nitriles in natural water shows that the rate of photodegradation is slow, presumably due to the photosensitization of water-soluble organic compounds (DOM).