Background levels of OCPs,PCBs,and PAHs in soils from the eastern Pamirs,China,an alpine region influenced by westerly atmospheric transport  

作　　者：Yang Ding Huanfang Huang Wei Chen Yuan Zhang Wenwen Chen Xinli Xing Shihua Qi 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430074,China [2]School of Environmental Studies,China University of Geosciences,Wuhan 430074,China [3]Department of Physical and Environmental Sciences,University of Toronto Scarborough,Toronto,ON,M1C 1A4,Canada [4]State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China [5]College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China

出　　处：《Journal of Environmental Sciences》2022年第5期453-464,共12页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 41473095, 41503112, 41773124, and 41907327);the Research Fund of Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control (No.Guikeneng 1701K008);supports from the China Scholarship Council (No. 201806410038);the Fundamental Research Funds for National Universities,China University of Geosciences (Wuhan)

摘　　要：Long-range atmospheric transport(LRAT)plays a crucial role in the occurrence of persis-tent organic pollutants(POPs)in remote regions.When studying the LRAT of POPs on the Tibetan Plateau,westerly-controlled regions have received insufficient attention compared with regions influenced by the Indian monsoon or air flow from East Asia.We investigated the residual levels of POPs in soils from the eastern Pamirs and used air backward trajectory analysis to elucidate the influence of potential source regions via LRAT.Organochlorine pes-ticides(OCPs,mainly comprising DDTs,HCHs,and HCB),polychlorinated biphenyls(PCBs,mainly comprising penta-and hexa-CBs),and polycyclic aromatic hydrocarbons(PAHs,mainly comprising three-and four-ring)were detected at low concentrations of 40-1000,<MDL-88,and 2100-34,000 pg/g,respectively.We elucidated three major geographical dis-tribution patterns of POPs,which were influenced by(1)the distribution of total organic carbon and black carbon in soil,(2)historical use of pesticides in the Tarim Basin,and(3)continuous emissions.Central Asia and the Tarim Basin were major potential source regions of POPs reaching the eastern Pamirs via LRAT.Historical use of technical HCH or lindane and technical DDT in potential source regions may contribute to the accumulation of HCHs and DDTs in the eastern Pamirs,respectively.Local sources seem to play a more important role in the occurrence of PAHs in the study area.By being under the control of less contaminated westerly air flow,the eastern Pamirs are more pristine than the core of the Tibetan Plateau where the Indian and East Asia monsoons deliver contaminants from highly industrialized areas in East China and India.

关 键 词：Persistent organic pollutants Long-range atmospheric transport WESTERLIES Tibetan Plateau Remote regions 

分 类 号：X169[环境科学与工程—环境科学]