利用XAD树脂被动采样技术和同位素稀释高分辨气相色谱／高分辨质谱联用法（ HRGC／HRMS）研究了2012年11月至2014年1月北京地区大气中多氯联苯（ PCBs）的污染现状、区域分布特征及季节性变化规律．结果表明，北京大气中19种PCBs总浓度为8．42—45．2 pg·m－3（平均值23．1 pg·m－3），各采样点全年平均毒性当量范围为0．33—3．33 fg WHO?TEQ m－3（平均值1．85 fg WHO?TEQ m－3）．PCB?11浓度范围为27．9—136 pg·m－3，平均值为78．2 pg·m－3．大气中的PCBs以低氯代（2—5氯代） PCBs为主．季节变化规律呈现出夏／秋季节PCBs浓度高于冬／春季节的规律；区域分布特征呈现出人口密集的城区大于背景区、工业区大于城区的规律．
Air samples in Beijing were collected from November 2012 to January 2014 by XAD?resin passive sampling techniques to investigate the current contamination levels,regional distribution and seasonal variation of atmospheric polychlorinated biphenyls ( PCBs ) . Instrumental analysis was performed by high resolution gas chromatography/high resolution mass spectrometry ( HRGC/HRMS). The results showed that the air concentration of PCBs were 8.42—45.2 pg·m-3(average 23?1 pg·m-3 ) . The TEQ values were 0. 33—3. 33 fg WHO?TEQ m-3 ( average1. 85 fg WHO?TEQ m-3). PCB?11concentrations ranged from 27.9 to 136 pg·m-3,with an average of 78.2 pg·m-3. PCB profiles were dominated by low ( 2—5) chlorinated PCBs. The concentration of PCBs in summer/autumn was higher than those in winter/spring. The regional distribution of PCBs in Beijing air were in the order of industrial region>densely populated urban areas>the background area.
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