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首页> 外文期刊>Environmental Science & Technology >Identification of Per- and Polyfluoroalkyl Substances in the Cape Fear River by High Resolution Mass Spectrometry and Nontargeted Screening
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Identification of Per- and Polyfluoroalkyl Substances in the Cape Fear River by High Resolution Mass Spectrometry and Nontargeted Screening

机译：通过高分辨率质谱和非靶向筛选鉴定海角恐惧河中的每种和多氟烷基物质

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摘要

Ongoing chemical development in response to regulation of historical perfluorinated compounds, (i.e., perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS)) has resulted in a proliferation of novel per- and polyfluorinated species. Screening and monitoring for these emerging chemicals benefit from a nontargeted approach due to a lack of necessary standards and a paucity of information about the replacement chemistries. In this paper, we apply nontargeted screening to the Cape Fear River of North Carolina, a fluorochemically impacted watershed. The continued presence of perfluorinated ether acids was confirmed, with a total of 37 unique chemical formulas comprising 58 isomers detected. Structural determination was carried out by LC-MS/MS to determine isomeric structures Ion Abundance where possible. Novel structures determined included perfluorinated ether acid species containing two acidic sites, polyfluorinated ether acids containing a single hydrogenation, and previously unreported perfluorinated ether acids. Compounds identified by an initial nontargeted screen were monitored over repeated sampling to track long-term reductions in PFAS content during emission source control. Hierarchical clustering of the time course data was used to associate groups of chemicals based on their trends over time. Six clusters were identified and showed some similarity in chemical class; they are believed to represent the byproducts of different fluorochemical production lines.
机译：持续的化学发育响应历史全氟化化合物的调节，（即全氟辛酸（PFOA）和全氟辛磺酸（PFOS））导致新的每种和多氟化物质的增殖。由于缺乏必要的标准和有关替代化学信息的信息，这些新兴化学品的筛选和监测受益于不可用的方法。在这篇论文中，我们将Nontargeted筛查应用于北卡罗来纳州的恐惧河，氟化物影响的流域。确认全氟化醚酸的持续存在，总共37种独特的化学式，其中检测到58个异构体。通过LC-MS / MS进行结构测定以在可能的情况下确定异构结构离子丰度。确定的新型结构包括含有两个酸性位点的全氟化醚酸盐，含有单氢化的多氟醚酸，以及预先报告的全氟化醚酸。通过重复采样监测由初始不靶向筛网鉴定的化合物，以跟踪发射源控制期间PFAS含量的长期减少。时间课程数据的分层聚类用于基于随着时间的推移基于其趋势与化学品组联系起来。鉴定了六个集群，并在化学类别上显示了一些相似之处;他们被认为代表不同含氟化合物生产线的副产品。

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  • 来源
    《Environmental Science & Technology》 |2019年第9期|4717-4727|共11页
  • 作者

    McCord James; Strynar Mark;

  • 作者单位

    US EPA Natl Exposure Res Lab Oak Ridge Inst Sci & Educ Durham NC 27711 USA;

    US EPA Natl Exposure Res Lab Durham NC 27711 USA;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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