中文摘要：

运用TaPL3（version3.00）模型计算了7种PCBs同系物在兰州地区通过大气和水体的特征迁移距离（CTD）及其总持久性（Po）v,讨论了其长距离传输潜力（LRTP）和Pov之间的关系,并以PCB28为例,应用灵敏度分析方法对模型的不确定性进行了研究。结果显示,兰州地区PCB28、PCB52、PCB77、PCB101、PCB138、PCB153和PCB180通过大气的CTDair在250～2500km之间,Pov在500～33000d之间,PCB138、PCB153和PCB180对源区影响较大;通过水体的CTDwater在6500～61000km之间,Pov在850～36000d之间,PCB28、PCB52、PCB77和PCB101对源区影响较大。7种PCBs的同系物LRTP和Pov之间没有直接的联系,就排放到大气中的PCBs而言,对Pov和CTD影响最大的参数都是理化参数;就排放到水体中的PCBs而言,Pov比CTD更依赖于PCBs的理化性质,而CTD比Pov更依赖于环境条件。同国外的研究相比,兰州地区PCB28通过大气的CTDair偏低,通过水体的CTDwater偏高,PCB28通过大气和水体的Pov都偏高。

英文摘要：

Polychlorinated Biphenyls（PCBs） are a group of persistent organic pollutants（POPs）,which can be away from the source area and distribute on a global scale because of its long-range transport,bioaccumulation and persistence characteristic.So they already become a threat to human health and ecosystems.Therefore,it is very significant to estimate the long-range transport potential（LRTP） and the overall persistence（Pov） of PCBs,in which that the PCBs environmental risk to the ecological system and human health of local and remote areas can be assessed and also it is available to manage and authorized controlled specified chemicals.In this paper,the characteristic travel distance（CTD） and Pov of 7 congeners of PCBs through air and water in Lanzhou area were calculated by TaPL3 model.Futhermore,the relationships between the LRTP and Pov were also discussed.In addition,the uncertainty of the model was identified by sensitivity analysis method taking PCB28 as an example.Modeling results indicated that CTDair of 7 PCB congeners through the atmosphere were between 250~2 500 km,while Pov were between 500~33 000 d,in which we can deduced that congeners of PCB138,PCB153 and PCB180 had the greater impact on the source region because of their smaller CTDair,otherwise,congeners of PCB28,PCB52,PCB77,PCB101 with larger CTDair tend to transport to remote area by air.Meanwhile the CTDwater of 7 PCB congeners were between 6 500~61 000 km and Pov were between 850~36 000 d in water,in which PCB28,PCB52,PCB77 and PCB101 had the greater impact on the water environment of source region because of their smaller CTDwater in water otherwise,PCB138,PCB153,PCB180 tend to away from water body of local area and flow to other regions by water.In addition,the study results also showed that there were no direct relationships between the LRTP and Pov of 7 PCBs congeners.Futhermore,the physical and chemical parameter（lg Kow） is the most influential parameters for Pov and CTDair when PCBs were emitted into the atmosphere.Moreov