Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
Water Res. 2022 May 15;215:118233. doi: 10.1016/j.watres.2022.118233. Epub 2022 Feb 26.
Natural biofilm can be a suitable medium for the monitoring of pollutants. Limited information is currently available regarding the occurrence of per- and polyfluoroalkyl substances (PFAS) in periphytic biofilm and low-trophic level organisms of freshwater ecosystems. In this study, surface water, biofilm, phytoplankton, and freshwater snails were collected from Taihu Lake, China, and characterized for 16 PFAS, including legacy compounds (PFSAs/PFCAs) and PFAS of emerging concern (fluorotelomer sulfonates and F-53B). The colonized biofilms effectively bioaccumulated PFAS from water, with the total concentration (∑PFAS) in the range of 1.96-20.1 ng/g wet weight, and the bioaccumulation factor increased with the PFAS log K values. As compared with phytoplankton, the ∑PFAS in biofilms displayed a stronger correlation with those in water. PFAS distinctly biomagnified from the biofilm to freshwater snail, with the biomagnification factor in the range of 3.09 ± 2.03 - 17.8 ± 10.2, implying the important role of biofilm in PFAS transfer in aquatic environment. Extracellular proteins production in biofilm increased with the water PFAS concentrations. The total extracellular polymeric substances (EPS) content increased with the water PFAS concentration firstly and then declined to a steady level, while the algal chlorophyll level exhibited a similar relationship with the PFAS in biofilm. High PFAS levels were also associated with depressed alpha diversity of fungal community in biofilms. Biofilm appears as a relevant indicator to characterize the occurrence of PFAS in aquatic ecosystems.
天然生物膜可以作为监测污染物的合适介质。目前有关淡水生态系统周丛生物膜和低营养级生物中持久性和多氟烷基物质（PFAS）的信息有限。在这项研究中，从中国太湖采集了地表水、生物膜、浮游植物和淡水螺，并对 16 种 PFAS 进行了特征描述，包括传统化合物（全氟羧酸/全氟磺酸）和新兴关注的 PFAS（氟代醇磺酸盐和 F-53B）。定植生物膜有效地从水中生物积累了 PFAS，总浓度（∑PFAS）范围为 1.96-20.1ng/g 湿重，生物积累因子随 PFAS 的 log K 值增加而增加。与浮游植物相比，生物膜中的∑PFAS 与水中的∑PFAS 相关性更强。PFAS 明显从生物膜向淡水螺生物放大，生物放大因子范围为 3.09±2.03-17.8±10.2，这表明生物膜在水生环境中 PFAS 转移中起着重要作用。生物膜中细胞外蛋白质的产生随水中 PFAS 浓度的增加而增加。总的细胞外聚合物（EPS）含量随水中 PFAS 浓度的增加而先增加后稳定，而藻类叶绿素水平与生物膜中的 PFAS 也存在类似的关系。高 PFAS 水平还与生物膜中真菌群落的 α 多样性降低有关。生物膜是描述水生生态系统中 PFAS 存在的相关指标。
