摘要
为阐明布洛芬(IBP)在海水中的间接光降解机理,研究了4种不同来源的溶解有机物(DOM)以及溶液初始pH值、盐度、NO 3-和HCO 3-对IBP间接光降解的影响.结果表明,4种DOM均可促进IBP的间接光降解作用,降解过程符合准一级反应动力学,4种DOM对IBP间接光降解的促进效果从大到小为:腐殖酸(JKHA)>Suwannee河腐殖酸(SRHA)>Suwannee河富里酸(SRFA)>Suwannee河天然有机物(SRNOM).DOM主要通过产生活性自由基促进IBP的间接光降解过程,其中1O2和OH的作用较显著.在初始pH5~11的范围内,IBP的光降解速率先降低后增加,在pH5时最快.盐度、NO 3-和HCO 3-初始浓度的增加均会促进IBP的间接光降解.
To clarify the indirect photodegradation mechanism of IBP,the indirect photodegradation behaviors of IBP were investigated in the presence of four kinds of dissolved organic matter(DOM)and were also assessed in the presence of seawater components and conditions such as salinity,pH,nitrate and bicarbonate.Firstly,the indirect photodegradation of IBP could be accelerated by the four different sources of DOM and followed pseudo-first-order kinetics,the photodegradation rate constants of APAP were found to decrease in the following order:JKHA>SRHA>SRFA>SRNOM.DOM promoted the indirect 1 photodegradation of IBP through the formation of various reactive intermediates,OH and O 2 were the main contributors.Secondly,in the range of pH 5~11,the photodegradation rate of IBP was firstly decreased and then increased,the highest photodegradation rate of IBP was found at pH 5.0.Lastly,the photodegradation rate constants of IBP increased with increasing salinity,nitrate and bicarbonate.
作者
白莹
崔正国
苏荣国
曲克明
BAI Ying;CUI Zheng-guo;SU Rong-guo;QU Ke-ming(Laboratory for Marine Fisheries Science and Food Production Processes, Pilot National Laboratory for Marine Science and Technology (Qingdao), Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2019年第7期2831-2837,共7页
China Environmental Science
基金
中国博士后科学基金资助项目(2018M632750)
山东省支持青岛海洋科学与技术试点国家实验室重大科技专项(2018SDKJ05)
青岛市博士后研究人员应用研究项目资助(喹诺酮类抗生素的间接光降解机理研究-以莱州湾为例)
关键词
布洛芬
间接光降解
溶解有机物
活性自由基
ibuprofen
indirect photodegradation
dissolved organic matter
reactive intermediates
