• 关键词：类二噁英-多氯联苯  大气沉降  广州  来源  季节变化

• 基金项目：国家自然科学基金(No.40803028);广东省自然科学基金(No.8451064004000324);中国科学院广州地球化学研究所知识创新工程领域前沿项目(No.GIGCX-07-14)

• 任曼
• 1. 中国科学院广州地球化学研究所 有机地球化学国家重点实验室, 广州 510640; 2. 珠江三角洲环境污染与控制研究中心, 广州 510640

• 陈德翼
• 中国科学院广州地球化学研究所 　有机地球化学国家重点实验室, 广州 510640

• 陈佩
• 中国科学院广州地球化学研究所 　有机地球化学国家重点实验室, 广州 510640

• 彭平安
• 中国科学院广州地球化学研究所 　有机地球化学国家重点实验室, 广州 510640

• 摘要：研究了广州市4个采样点2005年11月到2006年3月期间的类二噁英-多氯联苯(DL-PCBs)的沉降通量和组成.研究表明,广州市DL-PCBs的平均沉降通量为223pg·m^-2·d^-1,对应的毒性当量为1.5pg·m^-2·d^-1.城区DL-PCBs的沉降通量是郊区的1.6倍.各采样点DL-PCBs同系物分布相同,主要的同系物为PCB118、PCB105、PCB77,其平均含量分别为30%、18%和17%.湿季的DL-PCBs的沉降通量高于干季,表明降水对沉降通量影响明显.通过初步的源分析,发现某些含PCBs产品和固体废物焚烧可能是大气中DL-PCBs主要的来源.

• Abstract：Atmospheric deposition of dioxin-like polychlorinated biphenyls (DL-PCBs) was investigated at four locations in Guangzhou between November 2005 and March 2006. The average deposition flux of DL-PCBs was 223 pg·m^-2·d^-1,and the corresponding TEQwas 1.5 pg·m^-2·d^-1. The deposition fluxes of DL-PCBs in urban areas were 1.6 times as high as those in suburban areas. Similar congener profiles were observed for four sites with PCB118,PCB105 and PCB77 being the major congeners. The relative mass contribution to the total deposition fluxes of DL-PCBs was in the following order: PCB118 (mean 30%) > PCB105 (mean 18%) > PCB77 (mean17%). The deposition fluxes of DL-PCBs in the wet season were higher than those in the dry season,indicating that wet precipitation significantly impacted the deposition fluxes of DL-PCBs. Some products containing PCBs and solid waste incinerators were possibly the main sources of DL-PCBs.

• Key words：dioxin like-PCBs  atmospheric deposition  Guangzhou  sources  seasonal variation

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