Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 408, Issue 1, Pages 109-116Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2009.09.026
Keywords
BTEX; Beijing; Olympic Games and Paralympics; PID
Categories
Funding
- Chinese National Natural Science Foundation [20977097, 40830101, 40875082, 20577064]
- Chinese Academy of Sciences [KZCX2-YW-Q02-03]
- Platform Construction of Introducing Central Resources in Beijing [PXM200817830506995]
- National Basic Research and Development Program 973 [2010CB732304, 2005CB422201]
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The hourly concentrations of BTEX (Benzene, Toluene, Ethylbenzene, m,p-Xylene and o-Xylene) in the urban area of Beijing were measured during July-October 2008, covering the periods of the 2008 Olympic Games and Paralympic Games. The atmospheric BTEX were pre-concentrated on Tenax-TA tubes, and analyzed by GC-PID (Gas Chromatography with Photo Ionization Detector) after thermal desorption. During the games, the mean daytime concentrations of benzene, toluene, ethylbenzene. m,p-xylene and o-xylene were 2.37, 3.97, 1.92, 3.51 and 1.90 mu g/m(3), respectively, and were 52.8%, 63.9%, 56.4%, 56.8% and 46.9%, respectively lower than those after the games. The significantly positive correlation between BTEX and CO as well as the ratio of benzene/toluene suggested that the vehicle exhaust was the major source of BTEX during the whole investigated period. The extremely high ratios of ethylbenzene to m,p-xylene (E/X) were mainly observed at noontime in haze days, indicating that photochemical reactions were highly active under these typical days. (C) 2009 Elsevier B.V. All rights reserved.
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