研究论文
莫汉宏,安凤春,杨克武,刘晔.单甲脒水解动力学研究[J].环境科学学报,1995,15(3):310-315
单甲脒水解动力学研究
- HYDROLYTIC DYNAMICS OF PESTICIDE N'-(2,4-DIMETHYLPHkNYL)-N-METHYLFORMAMIDINE IN AQUATIC ENVIRONMENT
- 基金项目：国家自然科学基金
- 作者
- 单位
- 莫汉宏
- 中国科学院生态环境研究中心,北京 100085
- 安凤春
- 中国科学院生态环境研究中心,北京 100085
- 杨克武
- 中国科学院生态环境研究中心,北京 100085
- 刘晔
- 中国科学院生态环境研究中心,北京 100085
- 摘要：报道了单甲脒水解反应动力学与单甲脒在模拟水生生态系统中降解的研究。结果表明,单甲脒属在水中不稳定的化合物,在pH≤5时稳定,在pH≥6时则发生明显的水解反应,水解反应速率随反应介质pH值的增大而加速。单甲脒水解反应半衰期可从15.92d(pH6)缩短至1.40d(pH9).实验获得单甲眯水解反应温度效应系数为2.9,活化能为78.74kJ/mol.单甲脒在模拟水生生态系统中的实验结果与在缓冲溶液体系中所得的结果相近,在26℃pH8.28和pH9.13的水中,单甲脒的降解半衰期分别为3.23d和1.41d.
- Abstract：The study on the hydrolytic dynamics of pesticide N'-(2,4-dimethylphenyl)-N-methylformamidine(DMA)in aquatic environment and on its degradation in simulatedaquatic ecosystem were reported. The results showed that the pesticide DMA was not stablein aqueous solution and was readily decomposed in alkaline water. It was stable at pH<5.Hydrolytic reaction of the compound occurred at pH>6 in aquatic environment.Hydrolyticrate of DMA increased with increasing of pH value in reaction medium. The half-lives of DMA at 25℃ were 15.92 d at pH 6, and 1.40 d at pH 9,respectively.The temperaturecoefficient of hydrolysis for DMA was 2.9.The activation energy of hydrolysis for DMAwas 78.74 kJmol-1. The degradation of DMA in simulated aquatic ecosystem was similarto that in buffer solution. The half-lives of DMA degradation at 26℃ in simulated aquatic e-cosystem were 3.23 d at pH 9.13 and 1.41 d at pH 8.28,respectively.
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