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    谢晴

    • 高级工程师    
    • 主要任职:无
    • 性别:女
    • 毕业院校:大连理工大学
    • 学位:博士
    • 在职信息:在职
    • 所在单位:环境学院
    • 学科:环境工程
    • 办公地点:环境楼A315
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    Phototransformation of 2,3-Dibromopropyl-2,4,6-tribromophenyl ether (DPTE) in Natural Waters: Important Roles of Dissolved Organic Matter and Chloride Ion

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    论文类型:期刊论文

    第一作者:Zhang, Ya-nan

    通讯作者:Chen, JW (reprint author), Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn MOE, Dalian 116024, Peoples R China.

    合写作者:Wang, Jieqiong,Chen, Jingwen,Zhou, Chengzhi,Xie, Qing

    发表时间:2018-09-18

    发表刊物:ENVIRONMENTAL SCIENCE & TECHNOLOGY

    收录刊物:PubMed、SCIE

    卷号:52

    期号:18

    页面范围:10490-10499

    ISSN号:0013-936X

    摘要:Novel brominated flame retardants (NBFRs) have become ubiquitous emerging organic pollutants. However, little is known about their transformation in natural waters. In this study, aquatic photochemical behavior of a representative NBFR, 2,3-dibromopropyl-2,4,6-tribromophenyl ether (DPTE), was investigated by simulated sunlight irradiation experiment. Results show that DPTE can undergo direct photolysis (apparent quantum yield 0.008 +/- 0.001) and hydroxyl radical (center dot OH) initiated oxidation (second order reaction rate constant 2.4 x 10(9) M-1 s(-1)). Dissolved organic matter (DOM) promotes the photo degradation due to generation of excited triplet DOM and center dot OH. Two chlorinated intermediates were identified in the photo degradation of DPTE in seawaters. Density functional theory calculation showed that center dot Cl or center dot Cl-2(-) addition reactions on C-Br sites of the phenyl group and H-abstraction reactions from the propyl group are main reaction pathways of DPTE with the chlorine radicals. The center dot Cl or center dot Cl-2(-) addition proceeds via a replacement mechanism to form chlorinated intermediates. Environmental half-lives of DPTE relevant with photodegradation are estimated to be 6.5-1153.9 days in waters of the Yellow River estuarine region. This study provides valuable insights into the phototransformation behavior of DPTE in natural waters, which is helpful for persistence assessment of the NBFRs.