Spatial distribution of perfluoroalkyl acids in the Pearl River of Southern China

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• 作者：Yingyi Zhang ; Senchao Lai ; Zhen Zhao ; Fobang Liu ; Hongwei Chen ; Shichun Zou ; Zhiyong Xie ; Ralf Ebinghaus
• 关键词：PFAAs ; Surface water ; Pearl River ; Spatial variation
• 刊名：Chemosphere
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：93
• 期：8
• 页码：1519-1525
• 全文大小：602 K

文摘

An intensive campaign was conducted in September 2012 to collect surface water samples along the tributaries of the Pearl River in southern China. Thirteen perfluoroalkyl acids (PFAAs), including perfluorocarboxylates (PFCAs, C4-C11) and perfluorosulfonates (PFSAs, C4, C6-C8, and C10), were determined using high-performance liquid chromatography/negative electrospray ionization-tandem mass spectrometry (HPLC/(-)ESI-MS/MS). The concentrations of total PFAAs (¦²PFAAs) ranged from 3.0 to 52 ng L^?1, with an average of 19 ¡À 12 ng L^?1. The highest concentrations of ¦²PFAAs were detected in the surface water of the Dong Jiang tributary (17-52 ng L^?1), followed by the main stream (13-26 ng L^?1) and the Sha Wan stream (3.0-4.5 ng L^?1). Perfluorooctanoate (PFOA), perfluorobutane sulfonate (PFBS), and perfluorooctane sulfonate (PFOS) were the three most abundant PFAAs and on average accounted for 20 % , 24 % , and 19 % of ¦²PFAAs, respectively. PFBS was the most abundant PFAA in the Dong Jiang tributary, and PFOA was the highest PFAA in the samples from the main stream of the Pearl River. A correlation was found between PFBS and PFOA, which suggests that both of these PFAAs originate from common source(s) in the region. Nevertheless, the slope of PFBS/PFOA was different in the different tributaries sampled, which indicates a spatial difference in the source profiles of the PFAAs.