We investigated the presence of per- and poly fluoroalkyl substances (PFASs) in woven and nonwoven polypropylene geotextiles and four nonwoven polyester geotextiles commonly used in modern geosynthetic composite lining systems for waste containment facilities such as landfills. Targeted analysis for 23 environmentally significant PFAS molecules and methods for examining “PFAS total” concentrations were utilized to assess their occurrence in geotextiles. This analysis showed that most geotextile specimens evaluated in the current investigation contained the ultrashort chain PFAS compound pentafluoropropionic acid (PFPrA). While the concentrations ranged from nondetectable to 10.84 μg/g, the average measured concentrations of PFPrA were higher in polypropylene than in polyester geotextiles. “PFAS total” parameters comprising total fluorine (TF) and total oxidizable precursors (TOPs) indicate that no significant precursor mass nor untargeted intermediates were present in geotextiles. Therefore, this study identified geotextiles as a possible source of ultrashort PFASs in engineered lined waste containment facilities, which may contribute to the overall PFAS total concentrations in leachates or liquors they are in contact with. The findings reported for the first time herein may lead to further implications on the fate and migration of PFASs in geosynthetic composite liners, as previously unidentified concentrations, particularly of ultrashort-chain PFASs, may impact the extent of PFAS migration through and attenuation by constituents of geosynthetic composite liner systems. Given the widespread use of geotextiles in various engineering activities, these findings may have other unknown impacts. The significance of these findings needs to be further elucidated by more extensive studies with larger geotextile sample sizes to allow broader, generalized conclusions to be drawn.

中文翻译：

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土工织物是超短链 PFAS 对环境的无声贡献者吗？


我们调查了垃圾填埋场等废物遏制设施的现代土工合成复合衬里系统中常用的机织和非织造聚丙烯土工布以及四种非织造聚酯土工布中全氟烷基物质和多氟烷基物质 (PFAS) 的存在情况。利用对 23 种对环境具有重要意义的 PFAS 分子进行针对性分析以及检查“PFAS 总”浓度的方法来评估它们在土工织物中的存在情况。该分析表明，当前调查中评估的大​​多数土工织物样本均含有超短链 PFAS 化合物五氟丙酸 (PFP​​rA)。虽然浓度范围从不可检测到 10.84 μg/g，但聚丙烯中 PFPrA 的平均测量浓度高于聚酯土工织物。 “PFAS 总量”参数包括总氟 (TF) 和总可氧化前体 (TOP)，表明土工织物中不存在显着的前体质量或非目标中间体。因此，本研究确定土工织物是工程衬里废物遏制设施中超短 PFAS 的可能来源，这可能有助于提高它们所接触的渗滤液或液体中 PFAS 的总浓度。本文首次报告的研究结果可能会对土工合成复合材料衬垫中 PFAS 的命运和迁移产生进一步的影响，因为先前未确定的浓度，特别是超短链 PFAS，可能会影响 PFAS 迁移的程度和成分的衰减。土工合成材料复合衬垫系统。鉴于土工织物在各种工程活动中的广泛使用，这些发现可能会产生其他未知的影响。 这些发现的重要性需要通过更广泛的研究和更大的土工织物样本量来进一步阐明，以便得出更广泛、普遍的结论。