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首页> 外文期刊>Environmental Science & Technology >Generation of Perfluoroalkyl Acids from Aerobic Biotransformation of Quaternary Ammonium Polyfluoroalkyl Surfactants
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Generation of Perfluoroalkyl Acids from Aerobic Biotransformation of Quaternary Ammonium Polyfluoroalkyl Surfactants

机译：季铵多氟烷基表面活性剂的需氧生物转化产生全氟烷基酸

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摘要

The aerobic biotransformation over 180 days of two cationic quaternary ammonium compounds (QACs) with perfluoroalkyl chains was determined in soil microcosms, and biotransformation pathways were proposed. This is the first time that polyfluoroalkyl cationic surfactants used in aqueous film-forming foam (AFFF) formulations were studied for their environmental fete. The biotransformation of perfluoroocta-neamido quaternary ammonium salt (PFOAAmS) was characterized by a DT_(50) value (time necessary to consume half of the initial mass) of 142 days and significant generation of perfluoroalkyl carboxylic acid (PFOA) at a yield of 30 mol % by day 180. The biotransformation of perfluorooctane sulfon-amide quaternary ammonium salt (PFOSAmS) was very slow with unobservable change of the spiked mass; yet the generation of perfluorooctanesulfonate (PFOS) at a yield of 0.3 mol % confirmed the biotransformation of PFOSAmS. Three novel biotransformation intermediates were identified for PFOAAmS and three products including perfluorooctane sulfonamide (FOSA) for PFOSAmS through high-resolution mass spectrometry (MS) analysis and t-MS~2 fragmentation. The significantly slower PFOSAmS biotransformation is hypothesized to be due to its stronger sorption to soil owing to a longer perfluoroalkyl chain and a bulkier sulfonyl group, when compared to PFOAAmS. This study has demonstrated that despite overall high stability of QACs and their biocide nature, the ones with perfluoroalkyl chains can be substantially biotransformed into perfluoroalkyl acids in aerobic soil.
机译：在土壤微观世界中确定了两种带有全氟烷基链的阳离子季铵化合物（QAC）在180天的有氧生物转化，并提出了生物转化途径。这是首次研究了用于水性成膜泡沫（AFFF）配方中的多氟烷基阳离子表面活性剂的环保性能。全氟辛基-氨基季铵盐（PFOAAmS）的生物转化的特征是142天的DT_（50）值（消耗一半初始质量所需的时间）和大量生成的全氟烷基羧酸（PFOA），产率为30到第180天时，mol％。全氟辛烷磺酰胺季铵盐（PFOSAmS）的生物转化非常缓慢，而加标质量的变化却不可观察。然而，全氟辛烷磺酸盐（PFOS）的产生（产率为0.3 mol％）证实了PFOSAmS的生物转化。通过高分辨率质谱（MS）分析和t-MS〜2断裂，鉴定了三种用于PFOAAmS的新型生物转化中间体和三种产品，包括用于PFOSAmS的全氟辛烷磺酰胺（FOSA）。据推测，与PFOAAmS相比，PFOSAmS的生物转化明显较慢，这是由于其更长的全氟烷基链和更大的磺酰基基团对土壤的更强吸附。这项研究表明，尽管QAC具有很高的稳定性和杀生物剂的性质，但是带有全氟烷基链的QAC基本上可以在需氧土壤中生物转化为全氟烷基酸。

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  • 来源
    《Environmental Science & Technology》 |2016年第18期|9923-9932|共10页
  • 作者

    Sandra Mejia-Avendano; Sung Vo Duy; Sebastien Sauve; Jinxia Liu;

  • 作者单位

    Department of Civil Engineering, McGill University, Montreal, Quebec H3A 0C3, Canada;

    Department of Chemistry, Universite de Montreal, Montreal H3C 3J7, Canada;

    Department of Chemistry, Universite de Montreal, Montreal H3C 3J7, Canada;

    Department of Civil Engineering, McGill University, Montreal, Quebec H3A 0C3, 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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