文献类型：期刊文献

英文题名：Adsorption and degradation of sulfadiazine and sulfamethoxazole in an agricultural soil system under an anaerobic condition: Kinetics and environmental risks

作者：Shen, Genxiang[1,2];Zhang, Yu[2];Hu, Shuangqing[1];Zhang, Hongchang[1];Yuan, Zhejun[3];Zhang, Wei[2]

机构：[1]Shanghai Acad Environm Sci, Shanghai 200233, Peoples R China;[2]East China Univ Sci & Technol, Sch Resource & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[3]Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China

年份：2018

卷号：194

起止页码：266

外文期刊名：CHEMOSPHERE

收录：;EI(收录号：20174904508222);WOS:【SCI-EXPANDED(收录号:WOS:000423890700029)】；

基金：This research was supported by projects of the National Water Pollution Control and Treatment Science and Technology Major Project (2017ZX07207002), the Shanghai Science and Technology Committee (16DZ1204700), and the National Natural Science Foundation of China (21737005, 41371467).

语种：英文

外文关键词：Sulfadiazine; Sulfamethoxazole; Soil; Adsorption; Degradation; Anaerobic environment

摘要：Sulfonamides, one of the commonest antibiotics, were widely used on humans and livestock to control pathema and bacterial infections resulting in further environmental risks. The present study evaluated the adsorption and degradation of sulfadiazine (SDZ) and sulfamethoxazole (SMX) in an agricultural soil system under an anaerobic condition. Low sorption coefficients (K-d, 1.22 L kg(-1) for SDZ and 1.23 L kg(-1) for SMX) obtained from Freundlich isotherms experiment indicated that poor sorption of both antibiotics may pose a high risk to environment due to their high mobility and possibility of entering surface and ground water. Degradation occurred at a lower rate under the anaerobic environment, where both two antibiotics had higher persistence in sterile and non-sterile soils with degradation ratio <75% and DT50 > 20 d. Additionally, the addition of manure slightly increased degradation rates of SDZ and SMX, but there were no significant differences between single and repeated manure application at a later stage (p > 0.05), which suggested that the degradation was affected by both biotic and abiotic factors. Degradation rates would be slower at a higher concentration, indicating that degradation kinetics of SDZ and SMX were dependent on initial concentrations. During the degradation period, the antibiotics removal may change temperature, pH, sulfate and nitrate in soil, which suggested that the variation of antibiotics concentrations was related to the changes of soil physicochemical properties. An equation was proposed to elucidate the link between adsorption and degradation under different conditions, and to predict potential environmental risks of antibiotics. (C) 2017 Elsevier Ltd. All rights reserved.