Spatial distribution and source apportionment of PFASs in surface sediments from five lake regions, China.
Spatial distribution and source apportionment of PFASs in surface sediments from five lake regions, China.
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DOI：
10.1038/srep22674
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发表时间：
2016-03-07
影响因子：
4.6
通讯作者：
He Z
中科院分区：
文献类型：
--
作者：
Qi Y;Huo S;Xi B;Hu S;Zhang J;He Z
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PFAS的研究相对较少。本研究在全国48个湖泊和2个水库中采集了262个地表沉积物样本。各湖泊或水库表层沉积物中PFAS的平均浓度变化范围为0.086 ~ 5.79 ng/g dw，平均为1.15 ng/g dw。在5个湖区中，东部平原区湖泊的平均PFAS浓度最高。全氟辛酸、全氟癸酸和全氟辛烷磺酸（PFOS）是表层沉积物中主要的全氟磺酸。PFAS浓度与沉积物中总有机碳、总氮、总磷含量呈显著正相关，揭示了沉积特征对PFAS赋存的影响。绘制了二维分层聚类分析热图，分析了沉积物和单个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排放源，对C4-C14-全氟烷基羧酸和全氟辛烷磺酸总浓度的贡献率分别为77.7%和22.3%。
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.