Qi Yanjie, Huo Shouliang, Xi Beidou, Hu Shibin, Zhang Jingtian, He Zhuoshi
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
Sci Rep. 2016 Mar 7;6:22674. doi: 10.1038/srep22674.
Perfluoroalkyl substances (PFASs) have been found in environment globally. However, studies on PFAS occurrence in sediments of lakes or reservoirs remain relatively scarce. In this study, two hundred and sixty-two surface sediment samples were collected from forty-eight lakes and two reservoirs all over China. Average PFAS concentrations in surface sediments from each lake or reservoir varied from 0.086 ng/g dw to 5.79 ng/g dw with an average of 1.15 ng/g dw. Among five lake regions, average PFAS concentrations for the lakes from Eastern Plain Region were the highest. Perfluorooctanoic acid, perfluoroundecanoic acid and perfluorooctane sulfonic acid (PFOS) were the predominant PFASs in surface sediments. The significant positive correlations between PFAS concentrations and total organic carbon, total nitrogen and total phosphorus contents in sediments revealed the influences of sedimentary characteristics on PFAS occurrence. A two-dimensional hierarchical cluster analysis heat map was depicted to analyze the possible origins of sediments and individual PFAS. The food-packaging, textile, electroplating, firefighting and semiconductor industry emission sources and the precious metals and coating industry emission sources were identified as the main sources by two receptor models, with contributions of 77.7 and 22.3% to the total concentrations of C4-C14- perfluoroalkyl carboxylic acids and PFOS, respectively.
全氟烷基物质（PFASs）已在全球环境中被发现。然而，关于湖泊或水库沉积物中PFASs存在情况的研究仍然相对较少。在本研究中，从中国各地的48个湖泊和2个水库采集了262个表层沉积物样本。每个湖泊或水库表层沉积物中PFASs的平均浓度在0.086 ng/g干重至5.79 ng/g干重之间，平均为1.15 ng/g干重。在五个湖区中，东部平原地区湖泊的PFASs平均浓度最高。全氟辛酸、全氟十一烷酸和全氟辛烷磺酸（PFOS）是表层沉积物中主要的PFASs。PFASs浓度与沉积物中总有机碳、总氮和总磷含量之间的显著正相关揭示了沉积特征对PFASs存在情况的影响。绘制了二维层次聚类分析热图，以分析沉积物和单个PFAS的可能来源。通过两种受体模型确定食品包装、纺织、电镀、消防和半导体行业排放源以及贵金属和涂料行业排放源为主要来源，分别对C4 - C14全氟烷基羧酸和PFOS总浓度的贡献率为77.7%和22.3%。
