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实验室条件下,利用高效液相色谱研究了联苯肼酯在不同初始浓度,温度,pH值,自然水体中的水解动态特性.结果表明:25℃时,联苯肼酯在初始质量浓度为5,10,15,20 mg/L时的质量半衰期分别是70.01,100.46,177.73,330.07d,符合一级动力学方程模型.在初始质量浓度为10mg/L,温度为25,35,45,55,65℃时,水解半衰期分别是100.46,16.66,5.43,1.27,0.74d,温度效应系数Q为1.709~6.029;联苯肼酯水解活化能与温度呈负相关,活化熵的绝对值与温度呈正相关;在25℃,初始质量浓度为10mg/L,pH值为3.0,5.0,7.0,9.0,11.0的缓冲溶液中,水解半衰期分别是53.32,55.01,12.40,6.81,0.51d;在25℃,初始质量浓度为10mg/L,在河水,湖水,自来水,河水灭菌4种自然水体中的半衰期分别是30.40,33.81,17.73,10.36d.温度和pH值对联苯肼酯的水解反应影响较大,在高温、碱性环境下易水解.常温(25℃)下,联苯肼酯在水体中的滞留期较长,建议对其使用和残留情况进行跟踪与监测.
Under the laboratory conditions, the kinetic properties of bifenazate ester hydrolysis in natural water at different initial concentrations, temperatures and pH values were studied by high performance liquid chromatography.The results showed that when the initial concentration of bifenazate ester was 25 ℃, The half-lives of 5, 10, 15 and 20 mg / L were 70.01, 100.46, 177.73 and 330.07 d, respectively, which were consistent with the first-order kinetic equation model.At the initial concentration of 10 mg / L and the temperature of 25, 35, 45, 55,65 ℃, the half life of hydrolysis was 100.46,16.66,5.43,1.27,0.74d, the temperature effect coefficient Q was 1.709 ~ 6.029; hydrolysis activity of bifenazate ester was negatively correlated with temperature, the absolute value of activation entropy and temperature The half-lives of hydrolysis were 53.32,55.01,12.40,6.81,0.51d respectively at 25 ℃, initial concentration of 10mg / L, pH values of 3.0, 5.0, 7.0, 9.0 and 11.0. , The initial concentration of 10mg / L, in river water, lake water, tap water, river water sterilization of four kinds of natural water, respectively, the half-life of 30.40,33.81,17.73,10.36d temperature and pH value of the hydrolysis of Bifenazide ester than Large, easy to hydrolyze under high temperature and alkaline environment.Under normal temperature (25 ℃), the residence time of bifenazate in water is longer, and it is suggested that its use and residue Situation tracking and monitoring.