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Uptake of Poly- and Perfluoroalkyl Substances at the Air-Water Interface

机译：在空气-水界面吸收多氟烷基和全氟烷基物质

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摘要

Bench-scale experiments were performed to assess uptake of poly- and perfluoroalkyl substances (PFAS), both single compounds and mixtures, at the air-water interface. The focus was on evaluating uptake at field-relevant PFAS concentrations (<2 x 10(-4) mol m(-3) or 0.1 mg L-1), assessing the impacts of various PFAS mixtures, and quantifying the impacts of background NaCl concentrations. Both interfacial tension measurements and direct quantification of PFAS mass sorbed at the air-water interface in water films were used to evaluate PFAS interfacial partitioning. Results showed that a Freundlich-based model, rather than a Langmuir-based model, described perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) interfacial uptake. At lower and field-relevant PFOS and PFOA concentrations, the Langmuir-based model underpredicted interfacial uptake by up to several orders of magnitude. The interfacial partition coefficient, k(aw), increased as PFAS concentrations decreased. Results also showed that the interfacial tension and interfacial uptake of PFAS mixtures were (within a factor of 2) predicted based on the single solute systems assuming ideal dilute behavior. Furthermore, the addition of NaCl at concentrations of up to 0.01 M increased PFOS uptake by less than a factor of 2 at field-relevant PFOS concentrations. The results presented herein have important implications for PFAS migration in unsaturated soils as well as for remedial technologies that rely on PFAS interfacial sorption, particularly at field-relevant PFAS concentrations.
机译：进行了基准规模的实验，以评估空气-水界面处的多和全氟烷基物质（PFAS）（单一化合物和混合物）的吸收。重点是评估与田间相关的PFAS浓度（<2 x 10（-4）mol m（-3）或0.1 mg L-1）的吸收，评估各种PFAS混合物的影响以及量化背景NaCl的影响浓度。界面张力测量和在水膜中空气-水界面处吸附的PFAS质量的直接定量均用于评估PFAS界面分配。结果表明，基于Freundlich的模型而不是基于Langmuir的模型描述了全氟辛酸（PFOA）和全氟辛烷磺酸（PFOS）界面吸收。在较低和与现场相关的全氟辛烷磺酸和全氟辛烷磺酸浓度下，基于Langmuir的模型低估了最多几个数量级的界面吸收。界面分配系数k（aw）随着PFAS浓度的降低而增加。结果还表明，基于假设理想稀释行为的单一溶质体系，可以预测PFAS混合物的界面张力和界面吸收（2倍以内）。此外，在高达0.01 M的浓度下添加NaCl，在与田间相关的PFOS浓度下，PFOS的吸收量增加不到2倍。本文介绍的结果对于不饱和土壤中PFAS的迁移以及依赖PFAS界面吸附（尤其是在与田地相关的PFAS浓度下）的修复技术具有重要意义。

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  • 来源
    《Environmental Science & Technology》 |2019年第21期|12442-12448|共7页
  • 作者

    Schaefer Charles E.; Culina Veronika; Dung Nguyen; Field Jennifer;

  • 作者单位

    CDM Smith 110 Fieldcrest Ave 8 6th Floor Edison NJ 08837 USA;

    CDM Smith 14432 SE Eastgate Way 100 Bellevue WA 98007 USA;

    Oregon State Univ Dept Mol & Environm Toxicol 1007 Agr & Life Sci Bldg Corvallis OR 97331 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);
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