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Atmospheric occurrence, transport and gas–particle partitioning of polychlorinated biphenyls over the northwestern Pacific Ocean
Zilan Wu;  Tian Lin;  Zhongxia Li;  Yuanyuan Li;  Tianfeng Guo;  Zhigang Guo
2017
Source PublicationAtmospheric Environment
Volume167Pages:487-495
Abstract

Ship-board air samples were collected during March to May 2015 from the East China Sea (ECS) to the northwestern Pacific Ocean (NWP) to explore the atmospheric occurrence and gas–particle partitioning of polychlorinated biphenyls (PCBs) when the westerly East Asian Monsoon prevailed. Total PCB concentrations in the atmosphere ranged from 56.8 to 261 pg m−3. Higher PCB levels were observed off the coast and minor temperature-induced changes showed that continuous emissions from East Asia remain as an important source to the regional atmosphere. A significant relationship between Koa (octanol–air partition coefficient) and KP (gas–particle partition coefficient) for PCBs was observed under continental air masses, suggesting that land-derived organic aerosols affected the PCB gas–particle partitioning after long-range transport, while an absence of this correlation was identified in marine air masses. The PCB partitioning cannot be fully explained by the absorptive mechanism as the predicted KP were found to be 2–3 orders of magnitude lower than the measured Kp, while the prediction was closely matched when soot adsorption was considered. The results suggested the importance of soot carbon as a transport medium for PCBs during their long-range transport and considerable impacts of continental outflows on PCBs across the downwind area. The estimated transport mass of particulate PCBs into the ECS and NWP totals 2333 kg during the spring, constituting ca. 17% of annual emission inventories of unintentionally produced PCB in China.

KeywordPcbs Gas–particle Partitioning East Asian Continental Outflow Northwestern Pacific Ocean Transport Mass
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8361
Collection环境地球化学国家重点实验室
Affiliation1.Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Institute of Atmospheric Sciences, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Zilan Wu;Tian Lin;Zhongxia Li;Yuanyuan Li;Tianfeng Guo;Zhigang Guo. Atmospheric occurrence, transport and gas–particle partitioning of polychlorinated biphenyls over the northwestern Pacific Ocean[J]. Atmospheric Environment,2017,167:487-495.
APA Zilan Wu;Tian Lin;Zhongxia Li;Yuanyuan Li;Tianfeng Guo;Zhigang Guo.(2017).Atmospheric occurrence, transport and gas–particle partitioning of polychlorinated biphenyls over the northwestern Pacific Ocean.Atmospheric Environment,167,487-495.
MLA Zilan Wu;Tian Lin;Zhongxia Li;Yuanyuan Li;Tianfeng Guo;Zhigang Guo."Atmospheric occurrence, transport and gas–particle partitioning of polychlorinated biphenyls over the northwestern Pacific Ocean".Atmospheric Environment 167(2017):487-495.
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