文献类型：期刊文献

英文题名：Degradation kinetics and mechanism of sulfadiazine and sulfamethoxazole in an agricultural soil system with manure application

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

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

年份：2017

卷号：607

起止页码：1348

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20172903960527);WOS:【SCI-EXPANDED(收录号:WOS:000408755300134)】；

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), the National Natural Science Foundation of China (41371467), the Shanghai Pujiang Program (15PJD013), and the National Key Research and Development Program (2016YFD0800405).

语种：英文

外文关键词：Sulfadiazine; Sulfamethoxazole; Soil; Manure; Degradation pathways

摘要：Recently, under the application of waste-water, manure and biosolids, antibiotics have been used massively in agriculture resulted in antibiotic resistance and potential environmental risks. In the present study, the removal of sulfadiazine (SDZ) and sulfamethoxazole (SMX) in an agricultural soil system was explored. All the experiments were conducted under different incubation conditions for 49 days. The experimental results indicated that all the degradation processes could effectively follow a first-order kinetic model. Based on the analyses of these two antibiotics, SDZ had a higher reaction rate and a shorter DT50 value. Additionally, there were no marked differences in DT50 values at varying initial concentrations under the same conditions (p > 0.05). Compared with the non-sterile soil, the degradation rates of SMX and SDZ were slower (<70%), and the associated DT50 values (>21 days) were higher in the sterile soil. Because the biodegradation played a major role, it may be effective for the removal of these contaminants from the soils. The processes of SDZ and SMX degradations were slightly accelerated by applying manure (<20%). There were different accelerating effects on the removal of SDZ and SMX in soils by manure Single-and Repeated-application, which may be related to the amount of manure during the degradation processes, and different methods of adding manure could only affect the degradation rate. The major intermediate products were derived from the hydroxylation, sulfonamide S-N bond cleavage and aniline moiety oxidation. Therefore, the present study inferred that possible degradation pathways of SDZ and SMX were hydroxylation of the benzene ring, oxidation of the amine group at the benzene ring, ring open and S-N bond cleavage. Results revealed that more attention should be paid to the transformation products because they could be more toxic than the parent compounds. (C) 2017 Elsevier B.V. All rights reserved.