摘要
抗生素污染会对水生态系统和人类健康产生风险,其在水环境中的主要迁移转化途径为吸附和降解,环境条件直接影响抗生素在水环境中的残留水平。为进一步确定抗生素在水环境中降解和吸附行为的影响因素,以喹诺酮类抗生素为例,在建立高效液相色谱-质谱法测试喹诺酮类抗生素的基础上,通过单一变量实验研究介质粒径、水环境pH和初始浓度对氧氟沙星和加替沙星降解和吸附行为的影响。结果表明:在颗粒粒径0.25~2 mm,介质粒径越小,抗生素降解效率越低,在入渗能力和透气性较好的粗颗粒介质中,更有利于抗生素的降解和吸附。氧氟沙星和加替沙星降解率最高的pH分别为7.38和7.73,天然水pH范围利于抗生素的降解自净;在细砂介质中的吸附过程符合Freundlich方程,初始浓度对细砂介质中抗生素去除率的影响较为显著,随着初始浓度的增加而增大,在初始浓度为60μg/L达到峰值,继而缓慢降低,过高或过低的初始浓度均不利于抗生素的吸附和降解。
The water ecosystem and human health were posed risks due to the pollution of antibiotics in the aqueous environment.There were two main migration and transformation pathways in the aqueous environment:adsorption and degradation.The residual level of antibiotics in the aqueous environment was affected by environmental conditions.To further determine the influencing factors of antibiotic degradation and adsorption behavior in water environment,a method for determination of quinolone antibiotics with high performance liquid chromatography mass spectrometry was developed as an example.The effects of grain size of sediments,pH of aqueous environment and initial concentration were studied through single variable experiments on the degradation and adsorption characteristics of Ofloxacin and Gatifloxacin antibiotics.The results indicated that as decreasing of grain size of silica sand in the particle size range of 0.25~2 mm,degradation efficiency decreases.The process of degradation and adsorption of antibiotics were more favorable in coarse medium with higher infiltration capacity and permeability.The pH values of Ofloxacin and Gatifloxacin with the highest degradation efficiency were 7.38 and 7.73,respectively,which within the natural water pH range.The adsorption process in fine sand media conformed to Freundlich isothermal adsorption equation and the initial concentration was of significant effect on removal efficiency in fine sand medium.The removal efficiency increased as the increasing of initial concentration and peaked in 60μg/L and declined since then.The process of adsorption and degradation of antibiotics were inhibited by excess high or low initial concentrations.
作者
孔慧敏
杨四福
迟宝明
程奕
KONG Hui-min;YANG Si-fu;CHI Bao-ming;CHENG Yi(Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Institute of Disaster Prevention,Sanhe 065201,China;Chengdu University of Technology,College of Environment and Civil Engineering,Chengdu 610059,China;Liangshan Yellow River Bureau,Dongping Lake Administration,Jining 272600,China)
出处
《科学技术与工程》
北大核心
2021年第3期1196-1201,共6页
Science Technology and Engineering
基金
中央高校基本科研业务费(ZY20150202)
防灾科技学院2019年教育研究与教学改革项目(JY2019B04)。
关键词
抗生素
水环境
降解
吸附
antibiotics
aqueous environment
degradation
absorption
