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中文摘要：
对广州天河区大气中二噁（口英）进行年度监测和气固分配模式的研究。结果表明,天河区大气中存在较高浓度的二噁（口英）;低氯代二噁（口英）对毒性当量贡献较大,其主要分布在气相,2,3,4,7,8-PeCDF对毒性当量贡献最大,其贡献超过35%;高氯代二噁（口英）（主要是OCDF、OCDD、1,2,3,4,6,7,8-HpCDF和1,2,3,4,6,7,8-HpCDD）对浓度贡献较大,其主要分布在颗粒相。
英文摘要：
The occurrence of polychlorinated dibenzo-p-dioxins and dibenzofurans（PCDD /Fs） in the atmosphere of Tianhe District in Guangzhou was investigated annually.Meanwhile,gas-particle partitioning of PCDD /Fs was also examined in this study.The results showed that PCDD /Fs were ubiquitous in the atmosphere of Tianhe District with high concentrations.Lowchlorinated PCDD /Fs were mainly found in gaseous phase with a high contribution to the overall toxic equivalency quantity（TEQ）.Of all congeners we analyzed,2,3,4,7,8-PeCDF was the highest TEQ contributor,which accounting for more than 35% for the total.For high-chlorinated PCDD /Fs,the OCDF,OCDD,1,2,3,4,6,7,8-HpCDD,and 1,2,3,4,6,7,8-HpCDF were the main congeners,which were found in the particulate phase frequently.
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