Henry’s Law constants of 15 per- and polyfluoroalkyl substances determined by static headspace analysis

IF 6.6 Q1 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials letters Pub Date : 2022-11-01 DOI:10.1016/j.hazl.2022.100070
Ibrahim Abusallout , Chase Holton , Junli Wang , David Hanigan
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引用次数: 3

Abstract

While it is thought that some per- and polyfluoroalkyl substances (PFAS) may volatilize from aqueous solutions, experimentally measured Henry’s Law constants (kH, synonymous with air : water partition coefficient) are scarce. This leads to a lack of understanding of the partitioning of PFAS and an inability to predict concentrations above contaminated groundwater (e.g., vapor intrusion). We measured kH for 27 PFAS via headspace analysis and manipulations of the gas to liquid phase ratio. Fifteen PFAS produced mass spectrometry signals suitable for kH measurements. At 25 °C the experimentally measured dimensionless kH were: 0.31 – 2.82 for four fluorotelomer alcohols (FTOHs), 0.09 – 0.18 for three fluorotelomer sulfonates (FTSs), 0.30 – 1.01 for three iodinated PFAS, 0.43 – 0.92 for two sulfonamides, 3.86 for 6:2 fluorotelomer olefin, 0.69 for 8:2 fluorotelomer carboxylic acid, and 0.32 for 8:2 fluorotelomer acrylate. Longer fluoroalkyl chain length resulted in increased kH for FTOHs and FTSs, the only two groups in which chain length was studied. Perfluorinated sulfonates and carboxylates were generally not volatile enough to be measured, even at pH as low as 1, although fluorotelomers of both functional groups were measurably volatile. Temperature effects were well described by the van’t Hoff equation. kH was not significantly different in various environmentally relevant matrices demonstrating the broad applicability of the produced constants.

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静态顶空分析测定十五氟烷基和多氟烷基物质的亨利定律常数
虽然人们认为某些单氟烷基和多氟烷基物质(PFAS)可能从水溶液中挥发,但实验测量的亨利定律常数(kH,即空气:水分配系数的同义词)很少。这导致对PFAS的分配缺乏了解,并且无法预测污染地下水上方的浓度(例如蒸气侵入)。我们通过顶空分析和气液比操作测量了27种PFAS的kH。15个PFAS产生适合于kH测量的质谱信号。在25℃下,实验测得的无量纲kH分别为:四氟端粒醇(FTOHs)为0.31 ~ 2.82,三氟端粒磺酸(FTSs)为0.09 ~ 0.18,三碘化PFAS为0.30 ~ 1.01,两种磺胺为0.43 ~ 0.92,6:2氟端粒烯烃为3.86,8:2氟端粒羧酸为0.69,8:2氟端粒丙烯酸为0.32。较长的氟烷基链长导致FTOHs和FTSs的kH增加,这是仅有的两个链长被研究的基团。即使在pH值低至1时,全氟磺酸盐和羧酸盐的挥发性一般也不足以测量,尽管两种官能团的氟端聚体的挥发性都可测量。范霍夫方程很好地描述了温度效应。kH在各种环境相关矩阵中没有显着差异,表明所产生的常数具有广泛的适用性。
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来源期刊
Journal of hazardous materials letters
Journal of hazardous materials letters Pollution, Health, Toxicology and Mutagenesis, Environmental Chemistry, Waste Management and Disposal, Environmental Engineering
CiteScore
10.30
自引率
0.00%
发文量
0
审稿时长
20 days
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