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Atmospheric concentration characteristics and gas/particle partitioning of PCBs from the North Pacific to the Arctic Ocean

查看全文 作　　者：WANG [1]Zhen;NA [1]Guangshui;GAO [1]Hui;WANG [1]Yanjie;YAO [1]Ziwei 高影响力作者 机构地区：[1]National Marine Environmental Monitoring Center高影响力机构 出　　处：《Acta Oceanologica Sinica》索引2014年第33卷第12期,共8页高影响力期刊 基　　金：The Chinese Polar Environment Comprehensive Investigation and Assessment Programs under contract Nos 02-01,03-04,04-01 and 04-03;the National Natural Science Fundation of China under contract No.21377032 摘　　要：Polychlorinated biphenyls(PCBs) were measured in atmospheric samples collected from the North Pacific to the Arctic Ocean between July and September 2012 to study the atmospheric concentration characteristics of PCBs and their gas/particle partitioning. The mean concentration of 26 ∑PCBs(vapor plus particulate phase)(∑PCBs) was 19.116 pg/m3 with a standard deviation of 13.833 pg/m3. Three most abundant congeners were CB-28,-52 and-77, accounting for 43.0% to ∑PCBs. The predominance of vapor PCBs(79.0% to ∑PCBs) in the atmosphere was observed. PCBs were negative correlated with the latitudes and inverse of the absolute temperature(1/T). The significant correlation for most congeners was also observed between the logarithm of gas/particle partition coefficient(log KP) and 1/T. Shallower slopes(from-0.15 to-0.46, average-0.27) were measured from the regression of the logarithm of sub-cooled liquid vapor pressures(logpo L) and log KP for all samples. The difference of the slopes and intercepts among samples was insignificant(p>0.1), implying adsorption and/or absorption processes and the aerosol composition did not differ significantly among different samples. By comparing three models, the J-P adsorption model, the octanol/air partition coefficient(KOA) based model and the soot-air model, the gas/particle partitioning of PCBs in the Arctic atmosphere was simulated more precisely by the soot-air model, and the adsorption onto elemental carbon is more sensitive than the absorption into organic matters of aerosols, especially for lowchlorinated PCB congeners. 关 键 词：多氯联苯 大气浓度 分配系数 北太平洋 北冰洋 天然气 粒子 吸附模型
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