Department of Food and Environmental Engineering, Yangjiang Polytechnic, Yangjiang, 529566, China.
School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, 510632, China.
Arch Environ Contam Toxicol. 2021 Jul;81(1):133-141. doi: 10.1007/s00244-021-00855-x. Epub 2021 May 26.
The chemical substances in urban rivers influence municipal water systems and reflect the recent use of these chemicals by humans or industries around the urban center. In this study, seven perfluoroalkyl substances (PFASs)-perfluorohexanoic acid (PFHxA), perfluoroheptanoic acid (PFHpA), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), 2-perfluorohexyl ethanol (6:2 FTOH), 2-perfluorooctyl ethanol (8:2 FTOH), and 6:2 chlorinated polyfluoroalkyl ether sulfonic acids (F-53B)-could be detected and quantified in river water and sediment samples collected from one tributary of the Liuxi River, which is part of Pearl River near Guangzhou in Guangdong province, South China. The fluxes of target PFASs into Liuxi River and their related ecological risks were further estimated. The total concentrations of PFASs (ΣPFASs) ranged from 506 to 3.16 × 10 ng/L in water samples and 9.13 to 850 ng/L in sediment samples. The two dominant PFAS compounds were 6:2 FTOH and PFHpA, which accounted for more than 90.0% of ΣPFASs in river water and sediment. Correlation analysis showed that there was significant positive correlation (p < 0.01) between two selected PFASs (e.g., between 6:2 FTOH and PFHpA). Correlation analysis of PFASs in river water and sediment indicated most PFASs in sediment were partitioned from river water. The ecological risk assessment indicated that the detected PFASs have a low risk (HQ < 0.1) in river water and sediment to Daphnia magna in the Liuxi River.
城市河流中的化学物质影响城市水系，并反映出城市中心附近人类或工业近期对这些化学物质的使用情况。在这项研究中，从中国南方广东省广州市附近珠江的流溪河支流采集的河水和沉积物样本中，检测到并定量了七种全氟烷基物质（PFASs）-全氟己酸（PFHxA）、全氟庚酸（PFHpA）、全氟辛酸（PFOA）、全氟壬酸（PFNA）、2-全氟己基乙醇（6:2 FTOH）、2-全氟辛基乙醇（8:2 FTOH）和 6:2 氯代全氟烷氧基磺酸（F-53B）。进一步估算了目标 PFASs 流入流溪河的通量及其相关生态风险。河水样品中 PFASs 的总浓度（ΣPFASs）范围为 506 至 3.16×10 ng/L，沉积物样品中为 9.13 至 850 ng/L。两种主要的 PFAS 化合物是 6:2 FTOH 和 PFHpA，它们占河水和沉积物中 ΣPFASs 的 90.0%以上。相关分析表明，两种选定的 PFASs（例如 6:2 FTOH 和 PFHpA 之间）之间存在显著的正相关（p<0.01）。河水和沉积物中 PFASs 的相关分析表明，沉积物中的大多数 PFASs 是从河水中分配出来的。生态风险评估表明，在流溪河，检测到的 PFASs 对大型溞的风险较低（HQ<0.1）。
