Abstract：In order to investigate the migration characteristics of sulfonamide antibiotics in soil, sulfadiazine (SDZ) was used as a model component, and quartz sand (QS) was used as a medium to obtain iron oxide coated sand (IOCS). The effects of iron content and ionic strength on the migration of SDZ in IOCS were studied through column experiments, and the obtained results were simulated by Hydrus-1D software. The results of column experiments showed that the migration of SDZ was inhabited with an increase in the iron content on the surface of IOCS. The more the iron content, the higher the roughness, and the more the positive charge is carried through, which is beneficial to the adsorption of SDZ. An increase in the ionic strength promoted the migration of SDZ in QS and IOCS, which is mainly controlled by electrostatic interaction, surface complexation, and competitive adsorption. The migration process of SDZ under different iron contents and ionic strength can be better simulated by non-equilibrium one-site sorption model (OSM) in Hydrus-1D. The fitted curve is in agreement with the measured curve, where R2>0.97 and RMSE<0.032. The adsorption distribution coefficient, kF increased with an increase in iron content and decreased with an increase in ionic strength. The retardation factor, Rd showed the same trend as kF. The adsorption characteristic parameter β>1, and the first-order kinetic rate constant α were observed to be small.
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ZHANG Hui, LIN Qing, XU Shao-hui. Characteristics of sulfadiazine migration in iron oxide coated sand and a comparison with simulation results. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4712-4721.
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