中文摘要：

利用高分辨气相色谱/高分辨质谱法研究了土壤中PCB-11（3,3＇-二氯联苯,CAS 2050-67-1）的污染特征和分布规律,探讨了土壤中PCB-11的污染来源.结果表明,我国一般城市地区（天津、鞍山）和电子垃圾拆解地周边土壤中PCB-11的检出率为100%,PCB-11可能广泛存在于土壤介质中.天津、鞍山、电子垃圾拆解地土壤中PCB-11的平均浓度分别为163 ng.kg-1（21—750 ng.kg-1）、90 ng.kg-1（16—215 ng.kg-1）、108 ng.kg-1（33—291 ng.kg-1）.电子垃圾拆解地土壤中PCB-11对总PCBs浓度的贡献（0.02%—2.4%）明显低于一般城市地区（1.1%—23%）.天津、鞍山土壤中PCB-11的来源可能不同于电子垃圾拆解区.

英文摘要：

PCB-11（3,3′-dichlorobiphenyl） is not a product in the usage and production of commercial polychlorinated biphenyls（PCBs）.It has aroused great concern in recent years due to its special emission sources to the environment.In this paper,we report the ubiquitous distribution of PCB-11 in the soil compartment using high resolution gas chromatograph and high resolution mass spectrometer（HRGC/HRMS）,and discuss the potential sources of PCB-11 to the environment.The average PCB-11 concentrations in the soil of Tianjin,Anshan and the e-waste dismantling area were 163 ng·kg-1（21—750 ng·kg-1）,90 ng·kg-1（16—215 ng·kg-1） and 108 ng·kg-1（33—291 ng·kg-1）,respectively.The contribution of PCB-11 to the total PCBs in the e-waste dismantling area（0.02%—2.4%） was higher compared to the urban areas（1.1%—23%）.The ratio of PCB-11/PCB-4 in the soil from the e-waste areas was significantly lower than those from Tianjin and Anshan,which indicate that they have different sources.