Zhi-Guang Zhou1,2, Bin Zhao 1, Li Qi2, Peng-Jun Xu2, Yue Ren2, Nan Li2, Sen Zheng2, Hu Zhao2, Shuang Fan2, Ting Zhang2, Ai-Min Liu2, Ye-Ru Huang2, Li Shen3

  • 1 State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
  • 2 State Environmental Protection Key Laboratory of Dioxin Pollution Control, National Research Center for Environmental Analysis and Measurement, 1 South Yuhui Rd, Chaoyang District, Beijing 100029, China
  • 3 Ontario Ministry of the Environment, 125 Resources Road, Toronto, ON M9P 3V6, Canada

Received: January 31, 2013
Revised: May 28, 2013
Accepted: May 28, 2013
Download Citation: ||https://doi.org/10.4209/aaqr.2013.01.0032  

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Cite this article:
Zhou, Z.G., Zhao, B., Qi, L., Xu, P.J., Ren, Y., Li, N., Zheng, S., Zhao, H., Fan, S., Zhang, T., Liu, A.M., Huang, Y.R. and Shen, L. (2014). Distribution of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in the Atmosphere of Beijing, China. Aerosol Air Qual. Res. 14: 1269-1278. https://doi.org/10.4209/aaqr.2013.01.0032


 

ABSTRACT


Air samples were collected from six locations during the periods of February, 2011–March, 2012 in Beijing city. Samples were analyzed using HRGC-HRMS according to HJ 77. 2-2008. The concentrations, congener profiles, seasonal variation, spatial distribution, and sources identified were investigated. The mass concentrations of 2,3,7,8-substituted PCDD/Fs is 1750 to 10380 fg/m3 with an average of 3670 fg/m3. The highest concentration was observed at site DS in February 2011 and the lowest was at site NS in July 2011. The TEQ concentrations of PCDD/Fs ranged from 35.0 to 751 fg I-TEQ/m3, with an average of 251 fg I-TEQ/m3. The dominant contributor to total TEQ value is 2,3,7,8-PeCDFs, with an average contribution of 40%. Low-chlorinated PCDDs were observed in all samples in winter. The concentration and profiles exhibit obvious seasonal variation. The PCDD/Fs at six sampling sites did not show obvious spatial variation. Seasonal variation of PCDD/F concentrations indicated that the emission sources may be different. Fossil fuel combustion and automobiles may be the main dioxins emission sources during the heating period, whereas, in non-heating period, the automobiles alone are the main emission sources.


Keywords: PCDD/Fs; Atmosphere; Beijing; Sources; Seasonal and spatial variation


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