【摘要】 以地表水为研究对象,对甲基叔丁基醚(MTBE)在水中的消失动态、水解行为及影响因素进行了研究。水解作用研究结果表明:MTBE水解速率受温度和pH的影响。在pH分别为3.29,7.24,9.15的3种缓冲溶液中,25℃时的水解半衰期分别为69.59,81.26,165.8 d;15℃时的水解半衰期分别为107.5,114.6,183.4 d。在相同温度条件下,MTBE在酸性溶液中的水解速率比在中性和碱性溶液中更快。在pH分别为3.29,7.24,9.15的溶液中,水解过程的活化能Ea分别为76.2,74.1,72.0 kJ/mol,说明在不同pH条件下,MTBE的水解反应历程是相同的。模拟水体试验结果表明:MTBE在水中消失动态符合一级反应动力学模式,在室内培养条件下的消失半衰期为25.1~86.5 d,预示了MTBE在环境中的稳定性。更多还原

【Abstract】 Disappearing process,hydrolyzation and affecting factors of MTBE in surface water were studied.The result of hydrolyzation showed that the hydrolyzation process of MTBE in water accorded with the first order reaction kinetics model c=c0e-kt.When the temperature was 25℃,the hydrolyzation half-life of MTBE was 69.59,81.26 and 165.8 d respectively,and the pH was 3.29,7.24 and 9.15.So under the same temperature,when water was acidic,the hydrolyzation speed of MTBE was high.The activation energy was 76.2,74.1 and 72.0 kJ/mol respectively when pH was 3.29,7.24 and 9.15.This indicated that the same reaction had happened under different pH.The result of imitating the water experiment showed that the disappearing process of MTBE in water accorded with the first order reaction kinetics model.The result of the indoor experiment showed that the disappearance half-life of MTBE was from 25.1 to 86.5 d,which implied the stability of MTBE in environment.更多还原