Spatial and vertical variations of perfluoroalkyl substances in sediments of the Haihe River,China

查看全文 作　　者：Xiuli [1]Zhao;Xinghui [1]Xia;Shangwei [1]Zhang;Qiong [1]Wu;Xuejun [2]Wang

机构地区：[1]School of Environment,Beijing Normal University/State Key Laboratory of Water Environment Simulation;[2]College of Urban and Environmental Sciences,Peking University

出　　处：《Journal of Environmental Sciences》索引2014年第26卷第8期,共10页

基　　金：supported by the Major State Basic Research Development Program (No.2010CB951104);the National Science Foundation for Distinguished Young Scholars (No.51325902);the Specialized Research Fund for the Doctoral Program of Higher Education (No.20110003110030);the National Natural Science Foundation of China (No.51279010) 摘　　要：The levels of six perfluoroalkyl substances(PFASs) in surface sediment and their vertical variations in dated sediment cores from the Haihe River were investigated; studied substances included perfluorooctanoic acid(PFOA),perfluorononanoic acid(PFNA),perfluorooctane sulfonate(PFOS),perfluorodecanoic acid(PFDA),perfluoroundecanoic acid(PFUnA),and perfluorododecanoic acid(PFDoA). Results showed that the total PFAS concentration in surface sediment ranged between 0.52 and 16.33 ng/g dry weight(dw) with an average of3.47 ng/g dw,with PFOS and PFOA as the dominant PFASs. In general,the PFAS concentrations in the mainstream increased from the upper to the lower reaches,except that a drop occurred downstream of the Erdao dam. Although the PFASs in the sediment cores did not show a clear decreasing or increasing trend with depth,the three cores had a similar vertical variation.The PFAS levels were relatively low in the surface sediment,and reached the first high point at8–20 cm as a result of the wide use of PFASs from 1990 to 2000. After that the PFAS levels decreased,and then increased to a second high point at about 40–48 cm,which might be caused by the leaching of PFASs in sediment. Because PFASs have hydrophilic groups and relatively high solubility,the PFASs will transfer from the upper to lower layers of sediment when water infiltration occurs,leading to the fluctuation of PFAS levels in sediment cores. This study suggests that both the temporal variation of sources and transfer processes of PFASs in sediments are important factors influencing the vertical variation of PFASs in sediment cores. 关键词：表层沉积物全氟烷基垂直变化物质海河沉积物岩心 PFOA 空间

相关文献

参考文献（33）
引证文献（9）
耦合文献（0）

参考文献(33)

引证文献(9)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Spatial and vertical variations of perfluoroalkyl substances in sediments of the Haihe River,China

参考文献(33)

引证文献(9)

用户提示