| WANG Zhen,NA Guangshui,GAO Hui,WANG Yanjie,YAO Ziwei.Atmospheric concentration characteristics and gas/particle partitioning of PCBs from the North Pacific to the Arctic Ocean[J].Acta Oceanologica Sinica,2014,33(12):32-39 |
| 北太平洋和北冰洋大气中多氯联苯的浓度与气固分配行为 |
| Atmospheric concentration characteristics and gas/particle partitioning of PCBs from the North Pacific to the Arctic Ocean |
| 投稿时间：2014-03-01 修订日期：2014-07-08 |
| DOI：10.1007/s13131-014-0531-5 |
| 中文关键词: 多氯联苯 气固分配 北冰洋 黑灰-空气模型 半挥发性有机化合物 |
| 英文关键词:PCBs gas/particle partitioning Arctic Ocean soot-air model semi-volatile organic compounds |
| 基金项目: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. |
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| 中文摘要: |
| 对2012年7月至9月间采集自北太平洋和北冰洋大气中典型多氯联苯(PCBs)的浓度分布与气固分配行为进行了研究.大气中26种PCBs同族物的浓度(∑PCBs) (气相加颗粒相)为19.116 pg/m3,标准偏差为13.833 pg/m3.浓度最高的3种同族物为CB-28,-52和-77,占∑PCBs的43.0%.气相PCBs占∑PCBs的79.0%.本研究观测到∑PCBs与纬度间以及绝对温度倒数(1/T)间的显著负相关关系,同时,对大多数PCBs同族物,也观测到了气固分配系数的对数值(logKP)与1/T间的显著相关关系.PCBs的logKP与其过冷液体饱和蒸汽压(logp°L)具有显著的线性关系,其斜率较小(-0.15至-0.46,均值-0.27),且各样品间的斜率与截距值差别不显著(p > 0.1),表明PCBs在各样品中的吸附/吸收特征和颗粒物组成相似.大气颗粒物中炭黑的存在对分配的影响进行了考察,结果表明黑灰-空气模型的模拟结果要优于传统的J-P模型和基于正辛醇-空其分配系数的模型.分析结果还表明,PCBs在颗粒物元素碳上的吸附作用要强于在颗粒物有机质中的吸收作用,特别是对低氯取代PCBs,该趋势更加显著. |
| 英文摘要: |
| 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 (logKP) 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 (logp°L) and logKP 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. |
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