Kinetic study on the sorption and degradation of antibiotics in the estuarine water: an evaluation based on single and m
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RESEARCH ARTICLE
Kinetic study on the sorption and degradation of antibiotics in the estuarine water: an evaluation based on single and multiple reactions Jia Li 1,2 & Min Cui 1 Received: 23 April 2020 / Accepted: 20 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract It is important to study the fate and transport of antibiotics in aquatic environments to reveal their pollution status. The premise behind fate and transport studies is to evaluate the reaction processes of the target antibiotics. However, available research on the environmental behaviors of antibiotics in certain natural waters, such as estuarine water, is scarce. In this study, single reactions such as sorption, biodegradation, and photolysis and multiple degradation reactions of sulfamethoxazole (SMX), trimethoprim (TMP), and ciprofloxacin (CIP) in the estuarine water were studied. The sorption rates of the target antibiotics in the estuarine water-sediment system were very fast, and the sorption amounts varied among sediments and antibiotics. Hydrolysis did not contribute to the degradation of the target antibiotics. Biodegradation had a low contribution to the degradation of the target antibiotics in the estuarine water. In comparison, photolysis was the dominant degradation process for SMX, TMP, and CIP. The rates of photolysis of the tested antibiotics in the estuarine water were greater than those in pure water; thereby, indicating photolysis of these antibiotics was more prone to occur in the estuarine water. In the multiple degradation experiments, it was found that there may be synergistic effects between the single degradation processes. Thus, the aqueous concentrations of antibiotics decreased rapidly by sorption after entering the estuarine water and then decreased relatively slowly by photolysis and biodegradation. This study provides information for evaluating the environmental behaviors of antibiotics in estuarine environments. Keywords Antibiotics . Kinetics . Sorption . Hydrolysis . Photolysis . Biodegradation . Estuarine water
Introduction Antibiotics are becoming increasingly essential in modern society owing to their superior efficiency in treating diseases and
Responsible Editor: Ester Heath Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10194-4) contains supplementary material, which is available to authorized users. * Jia Li [email protected] 1
School of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
2
Key Laboratory of Coastal Environmental Process and Ecology Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, China
promoting animal growth. With the global increase in demand for animal protein for human consumption, the global consumption of veterinary antibiotics is expected to increase by 67% from 2010 to 2030 (Van Boeckel et al. 2015). The extensive consumption of antibiotics
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