Liu Baolin, Zhang Hong, Li Juying, Dong Weihua, Xie Liuwei
College of Physical Science and Technology, Shenzhen University, Shenzhen, 518060, China.
College of Chemistry, Changchun Normal University, Changchun, 130032, China.
Environ Monit Assess. 2017 May;189(5):213. doi: 10.1007/s10661-017-5921-7. Epub 2017 Apr 11.
Having been largely used in industrial and household products, perfluoroalkyl acids (PFAAs) appear in environmental and biological systems with prevalence and persistence and have raised great concern in recent years. The present study is aimed at studying concentrations and composition profiles of 16 PFAAs in surface sediments collected from 51 sampling locations in 4 main rivers of the Pearl River Delta, one of the economy-developed areas in China. The total PFAA concentrations (∑ PFAAs) were determined in a wide range of 1.89-15.1 ng g dw (dry weight) with an average concentration to be 3.54 ng g dw. Higher ∑ PFAAs were observed in the downstream of Dongjiang River and the Pearl River, possibly due to the discharge of industrial wastewater. Perfluoropentanoic acid (PFPeA) and perfluorooctane sulfonate (PFOS) were the dominant PFAAs, accounting for 51 to 85% of ∑ PFAAs in 27% of the samples. High PFPeA concentrations in sediments of urban river were scarcely observed in previous studies worldwide. The sources of short-chain perfluoroalkyl carboxylic acids (PFCAs) were significantly different from those of other PFAAs. Preliminary hazard assessment proved negligible for PFOS, perfluorooctanoic acid (PFOA), PFPeA, and perfluorohexanoic acid (PFHxA) concentrations in sediments from rivers of the Pearl River Delta.
全氟烷基酸（PFAAs）大量应用于工业和家用产品中，在环境和生物系统中普遍存在且具有持久性，近年来引起了人们的极大关注。本研究旨在研究从中国经济发达地区之一珠江三角洲4条主要河流的51个采样点采集的表层沉积物中16种全氟烷基酸的浓度和组成特征。全氟烷基酸的总浓度（∑PFAAs）在1.89 - 15.1 ng g干重（dw）的较宽范围内测定，平均浓度为3.54 ng g dw。东江和珠江下游的∑PFAAs浓度较高，可能是由于工业废水排放所致。全氟戊酸（PFPeA）和全氟辛烷磺酸（PFOS）是主要的全氟烷基酸，在27%的样品中占∑PFAAs的51%至85%。此前全球范围内的研究几乎未在城市河流沉积物中观察到高浓度的PFPeA。短链全氟烷基羧酸（PFCAs）的来源与其他全氟烷基酸的来源显著不同。初步危害评估表明，珠江三角洲河流沉积物中PFOS、全氟辛酸（PFOA）、PFPeA和全氟己酸（PFHxA）的浓度危害可忽略不计。
