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首页> 外文期刊>Environmental Science & Technology >Polyhalogenated Carbazoles in Sediments of Lake Michigan: A New Discovery
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Polyhalogenated Carbazoles in Sediments of Lake Michigan: A New Discovery

机译：密歇根湖沉积物中的多卤代咔唑：一个新发现

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摘要

Previously unknown halogenated compounds were detected during the analysis of halogenated flame retardants in two sediment cores collected from Lake Michigan. Gas chromatography coupled with high- or low-resolution mass spectrometry (MS) was used to determine the chemical structures for a total of 15 novel polyhalogenated carbazoles (PHCs) with the general molecular formula C_(12)H_(9-x-y-z)NCl_xBr_yI_z. On the basis of the mass spectra generated by electron impact (EI) and electron capture negative ionization (ECNI) MS, eight PHCs were tentatively identified as polybrominated carbazoles, while the others were mixed halogenated carbazoles containing, in addition to bromine, either chlorine or iodine or both. Patterns of halogen substitution of PHCs included Br_2 to Br_5, ClBr_2, ClBr_3, ClBr_4, CIBr_3I, Br_4I, and Br_3I_2, 3,6-Dibromocarbazole and 1,3,6,8-tetrabromocarbazole were also found among the PHCs. Profiles of the concentration versus depth of sediment at the two sites showed various patterns among polybrominated carbazoles. The abundance of mixed halogenated carbazoles peaked at depths of 12-16 cm, remained at relatively constant levels in deeper sediment, but declined markedly in more recently deposited sediments. This is the first study discovering the seven mixed halogenated carbazoles in the environment. Detailed methods for their detection and identification are provided.
机译：在分析从密歇根湖收集的两个沉积物岩心中的卤化阻燃剂时，检测到了以前未知的卤化化合物。气相色谱仪结合高分辨率或低分辨率质谱（MS）用于确定总共15种分子式为C_（12）H_（9-x-y-z）NCl_xBr_yI_z的新型多卤代咔唑（PHC）的化学结构。根据电子轰击（EI）和电子捕获负离子化（ECNI）MS产生的质谱图，初步确定了8种PHC为多溴咔唑，而其他为混合的卤化咔唑，除溴外还含有氯或碘或两者兼有。 PHCs的卤素取代模式包括Br_2至Br_5，ClBr_2，ClBr_3，ClBr_4，CIBr_3I，Br_4I和Br_3I_2，在这些PHCs中也发现了3,6-二溴咔唑和1,3,6,8-四溴咔唑。这两个位置的浓度与沉积物深度的关系曲线显示了多溴咔唑之间的各种模式。混合卤代咔唑的丰度在12-16 cm的深度处达到峰值，在较深的沉积物中保持相对恒定的水平，但在较新沉积的沉积物中则明显下降。这是首次发现环境中七种混合卤代咔唑的研究。提供了检测和识别它们的详细方法。

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  • 来源
    《Environmental Science & Technology》 |2014年第21期|12807-12815|共9页
  • 作者

    Jiehong Guo; Da Chen; Dave Potter; Karl J. Rockne; Neil C. Sturchio; John P. Giesy; An Li;

  • 作者单位

    School of Public Health, University of Illinois at Chicago, Chicago, Illinois 60612, United States;

    Cooperative Wildlife Research Laboratory and Department of Zoology, Southern Illinois University, Carbondale, Illinois 62901, United States;

    Research Division, Wellington Laboratories, Guelph, Ontario N1G 3M5, Canada;

    Department of Civil and Materials Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States;

    Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, Illinois 60607, United States;

    Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5B3, Canada;

    School of Public Health, University of Illinois at Chicago, Chicago, Illinois 60612, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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