Historical trends of PCBs and PBDEs as reconstructed in a lake sediment from southern Tibetan Plateau

作     者：Ruiqiang Yang Ting Xie Pu Wang Yingming Li Qinghua Zhang Guibin Jiang Ruiqiang Yang;Ting Xie;Pu Wang;Yingming Li;Qinghua Zhang;Guibin Jiang

作者机构：State Key Laboratory of Environmental Chemistry and EcotoxicologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of EnvironmentHangzhou Institute for Advanced StudyUCASHangzhou 310024China University of Chinese Academy of SciencesBeijing 100049China Institute of Environment and HealthJianghan UniversityWuhan 430056China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2020年第32卷第12期

页      面：31-38页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0815[工学-水利工程] 

基　　金：supported by the second Tibetan Plateau Scientific Expedition and Research Program (STEP (No. 2019QZKK0605) the National Natural Science Founda-tion of China (Nos. 21777184,41977327) the National Key Research and Development Program of China (No. 2017YFC1600301) 

主　　题：Persistent organic pollutants(POPs) PCBs PBDEs Sediment core Historical trend Tibetan Plateau 

摘      要：High-altitude lake sediment can be used as a natural archive to reconstruct the history of pollutants. In this work, the temporal distribution of polychlorinated biphenyls(PCBs) and polybrominated diphenyl ethers(PBDEs) were determined using a high-resolution gas chromatography coupled with high-resolution mass spectrometer(HRGC/HRMS) in an alpine lake sediment core collected from the southern Tibetan Plateau(TP) to examine whether the expected decreasing trends due to the implementation of the international Conventions could be observed. The concentrations of PCBs and PBDEs in the sediment core were in the range of 11.8–142 pg/g dw and ND-457 pg/g dw, and their fluxes were in the range of 2.51–31.7 ng/(m^2 ·yr) and ND-43.2 ng/(m^2 ·yr), respectively. The prevalence of low-chlorinated(tri-CB) PCBs and low-brominated(tri-to tetra-) PBDEs in most sections of the sediment profiles was observed, suggesting that the light molecular weight PCBs and PBDEs have most likely reached lake sediments by long-range atmospheric transport from distant sources. Despite the restrictions on their applications, the sediment records for the concentrations and fluxes showed no corresponding decreasing trend with restrictions for PCBs, which suggested that these POPs(e.g., PCBs) were still emitted to the environment owing to the influence of primary or secondary emissions. To our knowledge, this is the first report on input history of atmospheric PCBs and PBDEs recorded in TP Lake sediment.