Munoz Gabriel, Taxil-Paloc Alice, Desrosiers Mélanie, Vo Duy Sung, Liu Min, Houde Magali, Liu Jinxia, Sauvé Sébastien
Department of Chemistry, Université de Montréal, Montréal, QC H2V 0B3, Canada; Centre d'expertise en analyse environnementale du Québec, ministère de l'Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs, Québec, QC G1P 3W8, Canada.
Department of Chemistry, Université de Montréal, Montréal, QC H2V 0B3, Canada; Sciences Sorbonne Université, Paris 75005, France.
J Hazard Mater. 2025 Feb 15;484:136634. doi: 10.1016/j.jhazmat.2024.136634. Epub 2024 Nov 23.
Zwitterionic, cationic, and anionic per- and polyfluoroalkyl substances (PFAS) were investigated in freshwater sediments of Canada, including sites impacted by aqueous film-forming foams (AFFFs). The first step of the project involved optimizing the extraction method with equilibrated sediment-water-AFFF samples. The analytical method had acceptable linearity, accuracy, and precision in the sediment matrix, and was further validated with NIST SRM 1936. In the second step of the project, the method was applied to determine over 70 target PFAS in field-collected sediments (n = 102). At federal contaminated sites of Ontario, Newfoundland, and Québec (ditches and creeks at international airports with fire training or fire equipment testing areas), summed PFAS averaged 30 ng/g (maximum of 160 ng/g) with molecular patterns dominated by perfluorooctane sulfonate (maximum PFOS: 84 ng/g). Based on maximum observed concentrations >10 ng/g, other key PFAS at these AFFF-impacted sites included negative ion mode perfluorohexane sulfonate, perfluorohexane sulfonamide, fluorotelomer sulfonates (6:2 FTS and 8:2 FTS) and 5:3 fluorotelomer acid, and positive ion mode N-dimethylammoniopropyl perfluorohexane sulfonamide and 5:1:2 fluorotelomer betaine. In contrast, environmental sediment samples collected at a larger spatial scale (province-wide survey) were characterized by low ΣPFAS (generally <1 ng/g), with PFOS/PFOA below chronic toxicity thresholds for aquatic life.
对加拿大淡水沉积物中的两性离子、阳离子和阴离子全氟和多氟烷基物质（PFAS）进行了调查，包括受水成膜泡沫（AFFFs）影响的地点。该项目的第一步涉及用平衡的沉积物 - 水 - AFFF样品优化提取方法。该分析方法在沉积物基质中具有可接受的线性、准确性和精密度，并通过NIST SRM 1936进一步验证。在该项目的第二步中，该方法被应用于测定现场采集的沉积物（n = 102）中的70多种目标PFAS。在安大略省、纽芬兰和魁北克省的联邦污染场地（国际机场有消防训练或消防设备测试区域的沟渠和小溪），总PFAS平均为30 ng/g（最大值为160 ng/g），分子模式以全氟辛烷磺酸为主（最大PFOS：84 ng/g）。基于观察到的最大浓度>10 ng/g，这些受AFFF影响的场地的其他关键PFAS包括负离子模式的全氟己烷磺酸、全氟己烷磺酰胺、氟调聚物磺酸盐（6:2 FTS和8:2 FTS）和5:3氟调聚物酸，以及正离子模式的N - 二甲基氨丙基全氟己烷磺酰胺和5:1:2氟调聚物甜菜碱。相比之下，在更大空间尺度上采集的环境沉积物样本（全省范围的调查）的特点是总PFAS含量低（一般<1 ng/g），PFOS/PFOA低于水生生物的慢性毒性阈值。
