2006年1~4月在台湾海峡西岸东北部的平潭岛上空采集了大气颗粒物样品,分析样品中的多氯联苯(PCbS)、类二噁英类多氯联苯(dl-PCbS)等浓度及组成,研究了海岛大气的污染特征及其可能来源.结果表明:平潭岛大气颗粒物中PCbS的质量浓度为0.223~21.658 Pg/M3,平均值为4.820 Pg/M3.28个PCbS同系物单体中以PCb138和PCb189为主.颗粒物中PCbS的组成以六氯取代和七氯取代的高氯取代为主,平均约占总浓度的44.5%和32.2%.11个dl-PCbS的毒性当量范围为0.008~215.576 fg/M3,其中对毒性当量贡献较大的为PCb126、PCb123和PCb189.CPCbS-27和Cdl-PCbS-11均呈现出冬季1、2月浓度相对较高,春季3、4月较低的趋势.气团后向轨迹分析表明,平潭岛地区冬春季大气颗粒物中PCbS可能来源于北方城市地区的供暖和工业排放.Atmospheric particulate matter samples were collected at Pingtan Island over the western Taiwan Strait region from January to April,2006.Polychlorinated biphenyls( PCBs) of the samples were analyzed by Gas chromatography-Electron capture detector( GC-ECD),and then the concentrations,compositions,possible sources of PCBs and dioxin-like polychlorinated biphenyls( DL-PCBs) were studied.Results showed that the mass concentrations of PCBs in the Pingtan Island aerosol samples varied from 0.223 pg / m3 to 21.658 pg / m3,with an average of4.820 pg / m3.PCB138 and PCB189 were the major homolog monomers of the 28 analyzed PCBs' homolog monomers.Higher molecular weight PCB congeners were dominated and the average ratios of concentrations for hexaand hepta-CBs to the total PCBs concentrations were 44.5% and 32.2% respectively.The toxic equivalent quantities( TEQ) of 11 DL-PCBs were in the range of 0.008 ~ 215.576 fg / m3,while PCB126,PCB 123 and PCB 189 were the dominant contributors to the TEQ.Concentrations of CPCBs-27 and CDL-PCBs-11 were higher in winter( January and February),while a little lower in spring( March and April).Backward air mass trajectory analysis suggested that heating and industrial emissions of northern urban areas in China may contribute some PCBs pollution to Pingtan Island in winter and spring.国家海洋局海洋-大气化学与全球变化重点实验室开放基金资助项目(GCMAC1108); 国家社会公益专项资助项目(2004DIB5J178); 国家自然科学基金资助项目(41305133); 福建省自然科学基金资助项目(2013J05065); 国家海洋局第三海洋研究所基本科研业务费资助项目(海三科2009054
