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首页> 外文期刊>Environmental Science & Technology >Perfluorinated Carboxylic Acids in Directly Fluorinated High-Density Polyethylene Material
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Perfluorinated Carboxylic Acids in Directly Fluorinated High-Density Polyethylene Material

机译：直接氟化高密度聚乙烯材料中的全氟羧酸

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摘要

Perfluorinated carboiylk acids (PFCAs) are ubiquitous in the environment and have been detected in human blood worldwide. One potential route is direct exposure to PFCAs through contact with polymers that have been fluorinated through a process referred to as direct fluorination. PFCAs are hypothesized to be reaction byproducts of direct fluorination when trace amounts of oxygen are present The objective of this research was to investigate whether PFCAs could be measured in directly fluorinated high-density polyethylene (HDPE) bottles. PFCAs were quantified using Soxhlet extraction with methanol, followed by LC-MS/MS analysis. Total concentrations of PFCAs ranged from S.S ± 0.S3 to 113 ± 2.5 ng/bottle (1 L), with the short-chain PFCAs, perfluoropropanoic, perfluor-obutanoic, perfluoropentanoic, and perfluorohexanoic acids, being the dominant congeners observed. Relative PFCA concentrations varied depending on fluorination leveL Structural isomers were detected using 19F NMR and are hypothesized to have formed during the fluorination process; NMR data revealed the linear isomer typically comprised 55% of the examined sample. Internally branched, isopropyl branched, and t-butyl PFCA isomers of varying chain length were also identified. Electrochemical fluorination was previously thought to be the only source of branched PFCA isomers. The observation here of branched isomers suggests direct fluorination may be an additional source of exposure to these chemicals. The purpose of this study was to measure PFCAs in directly fluorinated material, serving as a previously unidentified source contributing to the environmental load of PFCAs, with potential for human exposure.
机译：全氟碳烷基酸（PFCA）在环境中无处不在，并且已在全世界的人类血液中被检测到。一种可能的途径是通过与已经通过称为直接氟化的方法氟化的聚合物接触而直接暴露于PFCA。假设存在痕量氧气时，PFCA是直接氟化的反应副产物。本研究的目的是研究是否可以在直接氟化的高密度聚乙烯（HDPE）瓶中测量PFCA。 PFCA使用甲醇索氏提取法进行定量，然后进行LC-MS / MS分析。 PFCA的总浓度范围为S.S±0.S3至113±2.5 ng /瓶（1 L），其中短链PFCA，全氟丙酸，全氟丁酸，全氟戊酸和全氟己酸是观察到的主要同源物。 PFCA的相对浓度因氟化水平而异。使用19F NMR检测到结构异构体，并假设其是在氟化过程中形成的。 NMR数据表明，线性异构体通常占所检查样品的55％。还鉴定了不同链长的内部支链，异丙基支链和叔丁基PFCA异构体。以前认为电化学氟化是支链PFCA异构体的唯一来源。在这里对支链异构体的观察表明，直接氟化可能是暴露于这些化学物质的另一个来源。这项研究的目的是测量直接氟化材料中的PFCA，它是以前无法确定的来源，对PFCA的环境负荷有潜在的影响，并且有可能被人体暴露。

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  • 来源
    《Environmental Science & Technology》 |2011年第19期|p.8053-8059|共7页
  • 作者

    Amy A. Rand; Scott A. Mabury;

  • 作者单位

    Department of Chemistry, University of Toronto, 80 St George Street, Toronto, Ontario MSS 3H6, Canada;

    Department of Chemistry, University of Toronto, 80 St George Street, Toronto, Ontario MSS 3H6, Canada;

  • 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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