Cheng Haixiang, Jin Hangbiao, Lu Bin, Lv Chenhan, Ji Yinghui, Zhang Hui, Fan Rui, Zhao Nan
College of Chemical and Material Engineering, Quzhou University, Quzhou, Zhejiang 324000, PR China.
Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, Zhejiang 310032, PR China.
Sci Total Environ. 2023 Jun 1;875:162687. doi: 10.1016/j.scitotenv.2023.162687. Epub 2023 Mar 10.
Many emerging poly- and perfluoroalkyl substances (PFASs) are being used in China, due to the gradual phase out of legacy PFASs. Occurrence and environmental behaviors of emerging PFASs in Chinese fresh water environment are still not well known. In this study, 31 PFASs, including 14 emerging PFASs, were measured in 29 pairs of water and sediment samples from Qiantang River-Hangzhou Bay, an important drinking water resource for cities in Yangtze River basin. Perfluorooctanoate was consistently the predominant legacy PFAS in water (8.8-130 ng/L) and sediment (3.7-49 ng/g dw). Twelve emerging PFASs were detected in water, with the dominance of 6:2 chlorinated polyfluoroalkyl ether sulfonates (6:2 Cl-PFAES; mean 11 ng/L, 0.79-57 ng/L) and 6:2 fluorotelomer sulfonate (6:2 FTS; 5.6 ng/L, < LOD-29 ng/L). Eleven emerging PFASs were found in sediment, and were also dominated by 6:2 Cl-PFAES (mean 4.3 ng/g dw, 0.19-16 ng/g dw) and 6:2 FTS (2.6 ng/g dw, < LOD-9.4 ng/g dw). Spatially, sampling sites closed to the surrounding cities had comparatively higher water concentrations of PFASs. Among emerging PFASs, 8:2 Cl-PFAES (3.0 ± 0.34) had the highest mean field-based log-transformed organic‑carbon normalized sediment-water partition coefficient (log K), followed by 6:2 Cl-PFAES (2.9 ± 0.35) and hexafluoropropylene oxide trimer acid (2.8 ± 0.32). p-perfluorous nonenoxybenzene sulfonate (2.3 ± 0.60) and 6:2 FTS (1.9 ± 0.54) had relatively lower mean log K values. To our knowledge, this is the most comprehensive study investigating the occurrence and partitioning behaviors of emerging PFASs in Qiantang River.
由于传统全氟和多氟烷基物质（PFASs）的逐步淘汰，许多新型PFASs正在中国被使用。新型PFASs在中国淡水环境中的存在情况和环境行为仍不为人所知。在本研究中，对来自钱塘江-杭州湾的29对水和沉积物样本中的31种PFASs进行了测定，钱塘江-杭州湾是长江流域城市重要的饮用水源。全氟辛酸始终是水中（8.8 - 130 ng/L）和沉积物中（3.7 - 49 ng/g干重）主要的传统PFASs。在水中检测到了12种新型PFASs，其中以6:2氯代多氟烷基醚磺酸盐（6:2 Cl-PFAES；平均11 ng/L，0.79 - 57 ng/L）和6:2氟调聚物磺酸盐（6:2 FTS；5.6 ng/L，<检测限-29 ng/L）为主。在沉积物中发现了11种新型PFASs，同样以6:2 Cl-PFAES（平均4.3 ng/g干重，0.19 - 16 ng/g干重）和6:2 FTS（2.6 ng/g干重，<检测限-9.4 ng/g干重）为主。在空间上，靠近周边城市的采样点PFASs的水体浓度相对较高。在新型PFASs中，8:2 Cl-PFAES（3.0 ± 0.34）具有最高的基于现场的对数转换有机碳归一化沉积物-水分配系数（log K），其次是6:2 Cl-PFAES（2.9 ± 0.35）和六氟环氧丙烷三聚体酸（2.8 ± 0.32）。对全氟壬烯氧基苯磺酸盐（2.3 ± 0.60）和6:2 FTS（1.9 ± 0.54）的平均log K值相对较低。据我们所知，这是关于钱塘江新型PFASs的存在情况和分配行为的最全面研究。
