水环境中头孢他啶降解行为规律探讨

Degradation Behavior of Ceftazidime in Aquatic Environment

利用高效液相色谱分析技术,研究了水环境中头孢他啶的降解行为规律,考察的影响因素包括温度、pH、水体类型、水体是否灭菌及光照等.结果表明,头孢他啶在试验条件下的降解过程符合一级动力学方程,半衰期为1.83 d.温度从5℃升高到45℃,头孢他啶降解速率加快了38.27倍;pH值从5升高到9,其降解速率加快了13.03倍;在污水中降解也较快.本研究为头孢他啶在水环境中的行为规律探讨和生态风险评价提供了基础数据.

The degradation behavior of ceftazidime in water was studied using high-performance liquid chromatography.Experiments were conducted under conditions with different temperature,pH,water samples,sterile non-sterile and light.The results show that the standard degradation kinetic process can be described by the first-order reaction（half-life = 1.83 d）.Increasing temperature（from 5 to 45 ℃） or pH（5 to 9） can accelerate degradation of ceftazidime（38.27 times for temperature and 13.03 times for pH,respectively）.The degradation rate of ceftazidime in wastewater is relatively high among the tested samples.This study provides some fundamental data for assessing the behavior and ecological risk of ceftazidime in aquatic environment.