頁籤選單縮合
題名 | Distribution of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in the Atmosphere of Beijing, China= |
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作者 | Zhou, Zhi-guang; Zhao, Bin; Qi, Li; Xu, Peng-jun; Ren, Yue; Li, Nan; Zheng, Sen; Zhao, Hu; Fan, Shuang; Zhang, Ting; Liu, Ai-min; Huang, Ye-ru; Shen, Li; |
期刊 | Aerosol and Air Quality Research |
出版日期 | 20140600 |
卷期 | 14:4 2014.06[民103.06] |
頁次 | 頁1269-1278 |
分類號 | 445.63 |
語文 | eng |
關鍵詞 | PCDD/Fs; Atmosphere; Beijing; Seasonal and spatial variation; Sources; |
英文摘要 | 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. |
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