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Atmospheric polychlorinated biphenyls measured during the 2008 Chinese National Arctic Research Expedition

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【作者】 WU XiaoguoJames C W LamXIA ChonghuanKANG HuiXIE ZhouqingPaul K S Lam

【Author】 WU Xiaoguo;James C W Lam;XIA Chonghuan;KANG Hui;XIE Zhouqing;Paul K S Lam;Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China;Advanced Lab for Environmental Research and Technology (ALERT), University of Science and Technology of ChinaCity University of Hong Kong (USTC-City U) Joint Advanced Research Center,Dushu Lake Higher Education Town, SIP;State Key Laboratory in Marine Pollution and Department of Biology and Chemistry, City University of Hong Kong;

【机构】 Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of ChinaAdvanced Lab for Environmental Research and Technology (ALERT), University of Science and Technology of ChinaCity University of Hong Kong (USTC-City U) Joint Advanced Research Center,Dushu Lake Higher Education Town, SIPState Key Laboratory in Marine Pollution and Department of Biology and Chemistry, City University of Hong Kong

【摘要】 From July to September 2008, air samples were collected aboard the R/V XUE LONG icebreaker(Snow Dragon) as part of the 2008 Chinese National Arctic Research Expedition program. ∑20PCBs in the atmosphere ranged from 6.20 to 365 pg?m-3 with average concentration 117±107 pg?m-3. Congener profiles in all samples showed a prevalence of tri- and tetrachlorobiphenyls, dominated by PCB-18, PCB-28, PCB-44 and PCB-52. Along the cruise, the highest concentration was observed over the Sea of Japan and the lowest over the high-latitude Arctic Ocean. Air mass backward trajectories indicated that samples with relatively high levels of PCBs might have been influenced by atmospheric transport of these chemicals from primary and/or secondary sources. PCB-18 displayed a significant correlation between vapor pressure and ambient temperature along the cruise, but there was no such correlation between gas-phase concentration and latitude. This suggests that atmospheric PCB-18 was related to volatilization from the earth surface during summer 2008, during which temperatures were relatively high. PCB-52 presented a significant correlation between gas-phase concentration and latitude, but no such correlation was found between vapor pressure and ambient temperature, indicating that atmospheric PCB-52 detected during the cruise might be attributed directly to atmospheric transport from source regions. In the Arctic, levels of PCB-52 in the floating sea ice region were higher than those measured in the open sea area and pack ice region. Intense ice retreat during summer 2008 might have enhanced the volatilization of previously accumulated PCBs from sea ice, especially those with heavier molecular weight and lower vapor pressure such as PCB-52.

【基金】 supported by grants from the National Natural Science Foundation of China (Grant nos. 41025020, 40776001, and 41203075);Chinese Academy of Sciences (Grant no. KZCX2-YWQN506);the Fundamental Research Funds for the Central Universities;funded by the Area of Excellence Scheme under the University Grants Committee of the Hong Kong Special Administrative Region, China (Grant no. Ao E/P-04/2004);a Hong Kong Research Grants Council (Grant no. City U 160610)
【所属期刊栏目】 Articles (2015年03期)
  • 【DOI】10.13679/j.advps.2015.3.00239
  • 【分类号】X831
  • 【下载频次】3
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