摘要
选择黑土和褐土两种典型东北地区土壤为吸附体,采用批平衡实验的方法,研究了四环素类抗生素(TCs)——土霉素(OTC)和金霉素(CTC)在褐土和黑土的吸附和解吸行为。结果表明:OTC和CTC都表现出较强的吸附性,且TCs在黑土上的吸附效果优于褐土。TCs在褐土和黑土上的吸附等温线均能较好地与Freundlich和Langmuir吸附方程相拟合,且Freundlich方程(R^2=0.994)拟合效果优于Langmuir方程(R^2=0.989)。四环素类抗生素的吸附过程是一个由迅速扩散和缓慢扩散组成的双速过程。CTC在褐土和黑土中属于"L型"等温吸附线;OTC在褐土和黑土中属于"S型"等温吸附线,表现出"协同吸附"的特点。OTC在黑土中吸附速率最快,解吸性最好,所以在黑土中具有更强的迁移性,对环境存在着更大的潜在威胁。
Choosing two typical northeast soil -- cinnamon soil and black soil as tetracycline antibiotics adsorbents, using OECD Guideline batch equilibrium method to study adsorption-desorption behavior and thermodynamics behavior of two kinds of tetracycline antibiotics （OTC and CTC） in cinnamon soil and black soil. The results show that OTC and CTC exhibited high adsorption rates. By comparing the size of adsorption quantity, TCs in black soil is better than that of in cinnamon soil. Tetracycline antibiotics adsorption isotherms in cinnamon soil and black soil are consistent with the Freundlich equation model and Langmuir equation model. The Freundlich equation is superior to the Langmuir equation. The adsorption process of antibiotics is a double speed process that has fast diffusion and slow diffusion. Tetracycline antibiotics adsorption isotherms resemble the linear curves according to adsorption strength （l/n）. Oxytetracycline in soil belongs to ＂S＂ type, isothermal adsorption and adsorption of chlortetracycline ＂L＂ isothermal adsorption. OTC has the bigger adsorption in the two soils and the faster desorption rate. Along with the antibiotic substances gradually accumulated in the soil environment, the harm of soil ecological to environment would grow.
出处
《地球环境学报》
2015年第5期317-322,共6页
Journal of Earth Environment
关键词
四环素类抗生素
吸附
解吸
褐土
黑土
tetracycline antibiotics
adsorption
desorption
cinnamon soil
black soil
作者简介
李鑫，E-mail：1ixin366@qq．com
