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Volatile organic compounds in 43 Chinese cities
被引:456
作者:
Barletta, B
Meinardi, S
Rowland, FS
Chan, CY
Wang, XM
Zou, SC
Chan, LY
Blake, DR
[1
]
机构:
[1] Univ Calif Irvine, Dept Chem, Irvine, CA 92717 USA
[2] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Hong Kong, Hong Kong, Peoples R China
[3] Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou, Peoples R China
[4] Zhongshan Univ, Dept Chem, Guangzhou, Peoples R China
关键词:
VOCs;
vehicular emissions;
urban air;
combustion;
gas-chromatography;
D O I:
10.1016/j.atmosenv.2005.06.029
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Whole air samples were collected in 43 Chinese cities in January and February 200 1, and methane and nonmethane hydrocarbon (NMHC) concentrations for those samples are here discussed. In order to identify the main sources of the hydrocarbons in these cities, cross-correlations with the general combustion tracer ethyne and the gasoline marker i-pentane were investigated. Most of the identified NMHCs correlated with ethyne or i-pentane suggesting that their primary source is combustion or gasoline evaporation. To differentiate between vehicular and other combustion sources, the benzene to toluene ratio characteristic of the Chinese vehicular fleet was calculated using roadside samples (collected in 25 cities). Cities where the main source of the NMHCs was traffic related were identified. The slope resulting from the correlation of selected gases was used to identify the likely sources of the NMHCs measured. Vehicular emissions were found to be an important source of isoprene in some cities. Different VOC mixing ratio distributions throughout the country were also investigated. This paper gives a general overview of urban VOCs in many Chinese cities. Future more rigorous studies will be necessary to further characterize VOC sources in China. (c) 2005 Elsevier Ltd. All rights reserved.
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页码:5979 / 5990
页数:12
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