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环境化学  2015 

深圳市大气中多氯联苯污染水平

Keywords: 大气,类二噁英多氯联苯,指示性多氯联苯,构型分布,深圳市

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Abstract:

为了解深圳市大气中多氯联苯(PCBs),包括类二噁英类多氯联苯(Dioxin-LikePCB,DL-PCB)和指示性多氯联苯(indicatorPCBs)的污染水平和分布特征,利用大流量空气采样器分别采集6个采样点的空气样品,每个采样点采集两个平行样品.通过高分辨气相色谱-高分辨双聚焦磁式质谱仪(HRGC/HRMS)对大气样品中12种二噁英类多氯联苯和6种指示性的PCBs单体进行了定性和定量分析.结果显示,∑PCBs的浓度为25.70—66.65pg·m-3,平均值为44.97pg·m-3.DL-PCBs总毒性当量为2.50—19.55fg(TEQ)·m-3,平均值为10.8fg(TEQ)·m-3.深圳市成人每天呼吸进入体内的DL-PCBs平均为1.81fgWHO-TEQ·kg-1BW·d-1;在指示性PCBs单体中,PCB28是浓度最高的单体,贡献率分别为71.6%—87.8%,其次是PCB52,占总浓度的11.8%—19.2%.DL-PCBs单体中PCB118的浓度最高,占总浓度的27.1%—50.7%,其次是PCB77和PCB105.PCB126是毒性当量浓度的主要贡献者,其平均贡献率为94.6%,其次为PCB169,其平均贡献率为2.17%.指示性多氯联苯浓度和DL-PCBs浓度显示了良好的一致性和相关性.深圳市大气样品中PCBs的浓度水平明显低于韩国京畿道以及我国台州的水平,大气中的多氯联苯TEQ浓度水平与横滨、曼彻斯特的浓度水平接近,略低于1998年日本城市均值和我国的北京市.

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