Conclusions
In this study, the influence of pH on transport and fate of three sulfonamide antibiotics was investigated in combination with the batch sorption tests and the soil column experiments. The batch sorption experiments showed Freundlich sorption isotherm can describe their adsorption behaviors under different pH.The batch experiments also revealed that increasing sorption potential was observed with decreasing pH for the all sulfonamides, since neutral and positive species being able to electrostatically bind to surface of soil mineral were abundant under acidic conditions. The dependency is one of important factors for interpretation of transport and fate of the veterinary antibiotics in soil-water system. Among the testing sulfonamides,