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首页> 外文期刊>Environmental Science & Technology >Spatial and Temporal Trends of Polyhalogenated Carbazoles in Sediments of Upper Great Lakes: Insights into Their Origin
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Spatial and Temporal Trends of Polyhalogenated Carbazoles in Sediments of Upper Great Lakes: Insights into Their Origin

机译：大湖上游沉积物中多卤代咔唑的时空趋势：其成因的认识

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摘要

Polyhalogenated carba2oles (PHCZs) have been in-creasingly detected in the environment. Their similarities in chemical structure with legacy pollutants and their potential toxicity have caused increasing concern. In this work, 112 Ponar grab and 28 core sediment samples were collected from Lakes Michigan, Superior, and Huron, and a total of 26 PHCZs were analyzed along with unsubstituted carbazole using gas chromatography coupled with single- or triple-quadrupole mass spectrometry. Our results show that the total accumulation of PHCZs in the sediments of the upper Great Lakes is >3000 tonnes, orders of magnitude greater than those of polychlorinated biphenyls (PCBs) and decabromodiphenyl ether (BDE209). The 27 individual analytes differ in spatial distribution and temporal trend. Our results showed that PHCZs with substitution patterns of -Br_(2_5_, -Cl_(1_2_Br_(2_4), or having iodine, were more abundant in sediment of Lake Michigan deposited before 1900 than those deposited more recently, implying a natural origin. Some "emerging" PHCZs have been increasingly deposited into the sediment in recent decades, and deserve further environmental monitoring and researdi. Other PHCZs with low halogen substitution may form from in situ dehalogenation of PHCZs having more halogens. Anthropogenic sources of PHCZs may exist, particularly for the emeiging and low molecular mass congeners.
机译：在环境中越来越多地检测到多卤代碳环（PHCZ）。它们在化学结构上与遗留污染物的相似性及其潜在毒性已引起越来越多的关注。在这项工作中，从密歇根湖，苏必利尔湖和休伦湖收集了112个Ponar捕获物和28个核心沉积物样品，并使用气相色谱与单或三重四极杆质谱联用分析了总共26种PHCZ和未取代的咔唑。我们的结果表明，大湖区上游沉积物中的PHCZ总量> 3000吨，比多氯联苯（PCB）和十溴二苯醚（BDE209）的数量级大。 27种单独的分析物在空间分布和时间趋势上有所不同。我们的结果表明，在1900年之前沉积的密歇根湖沉积物中，具有-Br_（2_5 _，-Cl_（1_2_Br_（2_4）或具有碘的取代模式的PHCZs较新沉积的PHCZs更为丰富，这暗示着自然起源。近几十年来，越来越多的新兴“ PHCZ”被沉积到沉积物中，值得进一步的环境监测和研究。其他低卤素取代度的PHCZ可能是由卤素含量更高的PHCZ原位脱卤形成的。可能存在人为来源的PHCZ，特别是对于新兴和低分子量同类物。

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  • 来源
    《Environmental Science & Technology》 |2017年第1期|89-97|共9页
  • 作者

    Jiehong Guo; Zhuona Li; Prabha Ranasinghe; Solidea Bonina; Soheil Hosseini; Margaret B. Corcoran; Colin Smalley; Karl J. Rockne; Neil C. Sturchio; John P. Giesy; and An Li;

  • 作者单位

    Sdiool of Public Health,;

    Sdiool of Public Health,;

    Sdiool of Public Health,;

    Sdiool of Public Health,;

    Department of Civil and Materials Engineering, and;

    Department of Earth and Environmental Sciences, 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 Civil and Materials Engineering, and;

    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 5C5, Canada;

    Sdiool of Public Health,;

  • 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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