MOE Key Laboratory of Pollution Processes and Environment Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; State Key Laboratory of Marine Pollution (SKLMP) and Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China.
State Key Laboratory of Marine Pollution (SKLMP) and Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China.
J Hazard Mater. 2022 Apr 5;427:128157. doi: 10.1016/j.jhazmat.2021.128157. Epub 2021 Dec 28.
Per- and polyfluoroalkyl substances (PFAS) are a family of anthropogenic chemicals, that have attracted increasing attention since the early 2000 s. Although forests have been shown to act as a filter and important sink for nonpolar persistent organic pollutants (POPs), relevant reports on PFAS are lacking. Air, soil, and leaf samples were collected inside and outside the forest from two regions of the Three-North Shelter Forest in northern China between 2017 and 2018. Twenty-seven PFAS were analyzed to study the effect of forest on the transport and fate of PFAS. The average ratios of PFAS in the air outside to inside the forest (Q) ranged from 2.83 ± 0.78-10.6 ± 3.1. A significant positive correlation was found between Q and the n-octanol-air partition coefficient of individual PFAS (p = 0.041). Higher Q values for most ionic PFAS were found in broad-leaved forests than in coniferous forests. Soil samples outside the forests showed higher PFAS levels than those inside. The measured concentrations of 8:2 fluorotelomer alcohol, a volatile neutral PFAS, in leaf samples were two orders of magnitude higher than those estimated using the equilibrium leaf-air partition of nonpolar POPs, indicating that it may not fit the case of PFAS with surface activity.
全氟和多氟烷基物质（PFAS）是一组人为化学物质，自 21 世纪初以来引起了越来越多的关注。尽管森林已被证明是一种过滤和重要的非极性持久性有机污染物（POPs）汇，但有关 PFAS 的相关报道却很少。2017 年至 2018 年，在中国三北防护林的两个地区，在森林内外采集了空气、土壤和叶片样本。分析了 27 种 PFAS，以研究森林对 PFAS 迁移和归宿的影响。森林内外空气中 PFAS 的平均比值（Q）范围为 2.83±0.78-10.6±3.1。发现 Q 与个别 PFAS 的正辛醇-空气分配系数之间存在显著正相关（p=0.041）。阔叶林中大多数离子型 PFAS 的 Q 值高于针叶林中的 Q 值。森林外的土壤样本显示出的 PFAS 水平高于森林内的水平。叶样本中测量到的挥发性中性 PFAS 8:2 氟代醇telomer 醇的浓度比使用非极性 POP 的平衡叶-气分配估计的浓度高出两个数量级，这表明它可能不适合具有表面活性的 PFAS 情况。
