不同水环境条件下马拉硫磷的降解规律

Malathion Degradation Law in Different Aquatic Environment

[目的]研究马拉硫磷在不同水环境条件下的降解规律。[方法]在不同pH值、不同温度及不同水样条件下,采用高效液相色谱法检测水环境中马拉硫磷剩余浓度随时间的变化情况。[结果]马拉硫磷降解活化能EA为73.10 kJ/mol,降解速率随pH值增大而加快,随温度升高而加快,湿地原水中降解最快、灭菌湿地原水次之、灭菌超纯水中最慢,准一级反应动力学方程可以描述其在水环境中的降解规律。[结论]马拉硫磷的降解速率受pH值、温度和水样条件的影响,自然水体中马拉硫磷降解速率较快。

The malathion degradation law in different aquatic environment was researched.[Methods] Under different pH,different temperature and different water conditions,the variation of malation residual concentrations with time in different aquatic environment was detected by the high performance liquid chromatography（HPLC）.[Results] The malathion degradation activation energy（EA） is 73.10 kJ/mol,and its degradation rate is accelerated with pH increasing,and increased with temperature rising.Its degradation rate in wetland raw water is the fastest,and in sterilized wetland water is faster,and in sterilized ultrapure water is slow.The pseudo-first-order kinetics can be applied to describe the malathion degradation law in aquatic environment.[Conclusions] The pH,temperature and water quality have effect on malathion degradation rates,and malathion degrade fast in natural water.