全氟烷基和多氟烷基物质(PFASs)是对北罗河生物多样性构成威胁的新兴污染物,黄土高原上受污染的水道受到各种人类活动的影响。然而,事件，空间分布，该地区PFAS的替代特征尚不清楚。本研究旨在揭示PFAS分布格局及其对北罗河流域水生态系统的影响。该地区的总PFAS浓度范围为16.64-35.70ng/L，主要是全氟羧酸（PFCAs）和全氟磺酸（PFSAs），贡献94%。Mantel测试揭示了传统长链（全氟辛酸和全氟辛烷磺酸钠）和新兴（6：2氟调聚物磺酸，2-全氟己基乙酸,和六氟环氧丙烷二聚酸(Gen-X))PFSA。规范对应分析排序表明，新兴PFAS的痕量，特别是2-全氟己基乙酸和六氟环氧丙烷二聚酸（Gen-X），显著影响水生群落的地理差异。总之,这项研究强调了全面探索北罗河流域PFASs的生态意义和潜在风险的重要性。
Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are emerging contaminants that pose a threat to the biodiversity of the Beiluo River, a polluted watercourse on the Loess Plateau impacted by diverse human activities. However, the occurrence, spatial distribution, and substitution characteristics of PFASs in this region remain unclear. This study aimed to unravel PFAS distribution patterns and their impact on the aquatic ecosystems of the Beiluo River Basin. The total PFAS concentration in the area ranged from 16.64-35.70 ng/L, with predominantly perfluorocarboxylic acids (PFCAs) and perfluorosulfonic acids (PFSAs), collectively contributing 94%. The Mantel test revealed threats to aquatic communities from both legacy long-chain (perfluorooctanoic acid and sodium perfluorooctane sulfonic acid) and emerging (6:2 fluorotelomer sulfonic acid, 2-Perfluorohexyl ethanoic acid, and hexafluoropropylene oxide dimer acid (Gen-X)) PFSAs. The canonical correspondence analysis ordination indicated that trace quantities of emerging PFASs, specifically 2-Perfluorohexyl ethanoic acid and hexafluoropropylene oxide dimer acid (Gen-X), significantly influenced geographical variations in aquatic communities. In conclusion, this study underscores the importance of comprehensively exploring the ecological implications and potential risks associated with PFASs in the Beiluo River Basin.
