摘要
在水产养殖以及畜牧业中,磺胺类抗生素被广泛地使用,导致环境中存在着大量的抗生素化合物。运用室内土柱淋溶法,研究了典型磺胺类抗生素(磺胺二甲基嘧啶、磺胺甲恶唑)在不同初始质量分数下的迁移规律以及降解机制。结果表明:表层土在不同初始质量分数抗生素条件下,在供试土壤中均呈现出向下迁移的趋势,且土壤各层抗生素的滞留量也随着表层土抗生素质量分数的增加而增加。这2种抗生素通过开环、甲基羟基化、S—C键断裂、苯胺基团氧化等一系列反应过程转化为不同的降解产物,确定其降解路径。
In aquaculture and animal husbandry,sulfonamides are widely used,resulting in a large number of antibiotic compounds in the environment.The migration and degradation mechanism of typical sulfonamides(sulfamedimethazine,sulfamethoxazole)at different initial mass fractions were studied by soil column leaching method.The results showed that the surface soil showed a downward migration trend under different initial mass fractions of antibiotics,and the retention of antibiotics in each layer of soil also increased with the increase of the mass fraction of antibiotics in the surface soil.The two antibiotics were transformed into different degradation products through a series of reaction processes such as ring-opening,methyl hydroxylation,S—C bond breaking,aniline group oxidation,etc.
作者
李鑫
王海芳
LI Xin;WANG Haifang(School of Environmental and Safety Engineering,North University of China,Taiyuan Shanxi 030051,China)
出处
《当代化工》
CAS
2024年第2期422-429,共8页
Contemporary Chemical Industry
基金
国家科技重大专项课题(项目编号:2018YFC1801104)。
关键词
磺胺类药物
土壤降解
抗生素
迁移规律
降解路径
Sulfonamides
Soil degradation
Antibiotics
Migration rule
Degradation path
