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.
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