氧四环素在典型土壤中的吸附/解吸行为及其吸附态生物有效性研究  

Adsorption and desorption of oxytetracycline on typical soils and soil-adsorbed oxytetracycline's bioavailability

作　　者：彭凤姣[1] 应光国[1] 周丽君[1] 刘有胜[1] 潘长桂[1] 梁燕秋[1] 

机构地区：[1]中国科学院,广州地球化学研究所,有机地球化学国家重点实验室,广东广州510640

出　　处：《地球化学》2015年第1期71-78,共8页Geochimica

基　　金：中国科学院重要方向创新项目(KZCX2-EW-108);环保公益项目(201309031)

摘　　要：采用批平衡实验方法,研究了氧四环素(oxytetracycline,OTC)在褐土、红壤与森林土壤中的吸附/解吸行为,同时以大肠埃希菌(Escherichia coli ATCC 25922,E.coli ATCC 25922)作为实验菌株,研究了土壤吸附态的氧四环素的生物活性。结果表明,Freundlich和Langmuir模型均可以对OTC在三种土壤中的吸附和解吸曲线数据进行良好的拟合,OTC在褐土中的吸附/解吸等温线呈线性,而在红壤与森林土壤中的吸附/解吸等温线呈非线性,且Langmuir方程拟合效果优于Freundlich方程。OTC在三种土壤上的解吸过程均存在明显的滞后性。土壤吸附态抗生素对细菌生长的抑制作用表明,OTC与土壤发生吸附作用之后,依然具有生物有效性。This study investigated the adsorption and desorption of OTC in three different soils by using batch equilibrium tests, and assessed the biological activity of soil-adsorbed OTC by using E.coli ATCC 25922 as the experimental strain. The results showed that the data of adsorption and desorption for OTC on all soils were well fitted with both Freundlich and Langmuir models. Both adsorption and desorption isotherms of OTC on the Cinnamon soil were linear, while those for the Forest soil and Red soil were nonlinear. The Langmuir model gave better fitting than Freundlich model for all three soils. An adsorption-desorption hysteresis phenomenon was observed in all the three soils. The bioavailability experiments with E. coli showed that the adsorbed OTC was still active against bacteria.

关 键 词：氧四环素 土壤 吸附 解吸 生物有效性 

分 类 号：P593[天文地球—地球化学]