Ultrasonic Degradation of Chlorobenzene、Hydroquinone and Their Mixtures Shen Zhuangzhi Cheng Jianzheng Wu Shengju Doctor,Wuhan Institute of Physics and Mathematics,The Chinese Academy of Sciences,Wuhan 430071,China.Degradation effects of organic matter on chlorobenzene、hydroquinone and their mixtures are researched by ultrasound. In addition,effects of solution pH on their are considered,too.The results show that hydrophobic、high-volatile chlorobenzene is easy to degrade,and have no effect of pH of solution on it.Hydrophilic、novolatile hydroquinone is not easy to degrade,and have effect of pH of solution on it markedly.Their mixture dealed show degradation of novolatile hydroquinone is prevented because of existence of volatile chlorobenzene.ultrasonic degradation; chlorobenzene; hydroquinone; pH