2014年1月在杭州市选择5个点位采集大气颗粒物PM2.5样品,采用同位素稀释高分辨气相色谱/高分辨质谱测定PM2.5中的二恶英(PCDD/Fs)和多氯联苯(PCBs),对PM2.5的污染状况以及PM2.5中PCDD/Fs和PCBs的污染水平及分布特征进行了研究.PM2.5的质量浓度范围为85~ 168 μg/m3,PM2.5污染较重,但与2004年同期相比明显降低.PM2.5中PCDD/Fs的毒性当量(TEQ)为0.277~ 0.488 pg I-TEQ/m3,明显高于2004年同期采集样品.颗粒物中PCDD/Fs以八氯代二苯并-对-二恶英(OCDD)为主,毒性当量主要贡献者为2,3,4,7,8-五氯代二苯并呋喃(2,3,4,7,8-PeCDF).PM2.5中PCBs的质量浓度范围为2.9~8.1 pg/m3,二恶英类多氯联苯(DL-PCBs)的毒性当量范围为2.6~6.1fg WHO-TEQ/m3,污染较低.PCBs在颗粒物中分布以PCB-28为主,但对毒性当量贡献最大的为PCB-126.PCDD/Fs和PCBs的气-固分配特征表现为PCDD/Fs主要分布于颗粒物中,而PCBs主要分布于气相中.
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