A comparison of the levels and particle size distribution of lower chlorinated dioxin/furans (mono- to tri-chlorinated homologues) with those of tetra- to octa-chlorinated homologues in atmospheric samples.
A comparison of the levels and particle size distribution of lower chlorinated dioxin/furans (mono- to tri-chlorinated homologues) with those of tetra- to octa-chlorinated homologues in atmospheric samples.
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DOI：
10.1016/j.chemosphere.2016.02.059
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发表时间：
2016-05
期刊：
影响因子：
8.8
通讯作者：
X. Zhang;M. Zheng;Guorui Liu;Qingqing Zhu;Shujun Dong;Hongxing Zhang;Xiaoke Wang;K. Xiao;Lirong Gao;Wenbin Liu
中科院分区：
文献类型：
--
作者：
X. Zhang;M. Zheng;Guorui Liu;Qingqing Zhu;Shujun Dong;Hongxing Zhang;Xiaoke Wang;K. Xiao;Lirong Gao;Wenbin Liu
关于大气中低氯化二苯并对二恶英和二苯并呋喃（一氯至三氯对二恶英/呋喃，三氯甲烷1 -3DD/Fs）的含量和粒度分布的信息很少，而一些研究调查了四氯至八氯同系物（三氯甲烷4 -8DD/Fs）。本研究首次对北京市郊区大气中三氯甲烷（Cl_3DD/Fs）的浓度和粒径分布进行了测定，并与三氯甲烷（Cl_4DD/Fs）的浓度和粒径分布进行了比较。三氯甲烷1 -3DD/Fs的平均浓度为54.63 pg m−3，约为三氯甲烷4 -8DD/Fs的5.4倍。PCDD/F同系物中，PCDD/F同系物中MoCDFs的比例最大（43%），PCDD/F同系物中MoCDFs的比例最大（43%）。C3 Cl 1 -3DD/Fs主要存在于气相中，而C3 Cl 4 -8DD/Fs主要存在于颗粒相中。大多数的Cl_2Cl_1 -3DD/Fs（70%）出现indae> 1.0 μm的颗粒，这与Cl_2Cl_4 -8DD/Fs观察到的趋势相反，其中78%出现indae< 1.0 μm的颗粒。高浓度的PCDD/Fs和不同的分布模式表明，有必要考虑低氯同系物，以提高我们对PCDD/Fs在大气中的环境行为和健康风险评估的理解。
There is very little information on the levels and particle size distributions of lower chlorinated dibenzo-p-dioxins and dibenzofurans (mono- to tri-CDD/Fs, ΣCl1–3DD/Fs) in the atmosphere, while a number of studies have examined tetra- to octa-chlorinated homologues (ΣCl4–8DD/Fs). In this study, we measured the concentration and particle size distribution of ΣCl1–3DD/Fs in ambient air in suburban Beijing and compared them with that of ΣCl4–8DD/Fs for the first time. The mean concentration of ΣCl1–3DD/Fs was 54.63 pg m−3, which is about 5.4 times that of ΣCl4–8DD/Fs. The ΣCl1–3DD/Fs accounted for 85% of ΣCl1–8DD/Fs, and MoCDFs made up the largest proportion (43%) of PCDD/F homologues. The ΣCl1–3DD/Fs mainly occurred in the gas phase, while the ΣCl4–8DD/Fs mainly occurred in the particulate phase. The majority of ΣCl1–3DD/Fs (70%) occurred indae> 1.0 μm particles, which is the reverse of the trend observed for ΣCl4–8DD/Fs, of which 78% occurred indae< 1.0 μm particles. The observed high concentrations of ΣCl1–3DD/Fs and different distribution patterns demonstrate that it is necessary to consider the lower chlorinated homologues to improve our understanding of the environmental behavior and health risk assessments of PCDD/Fs in the atmosphere.