Chemical composition of PM2.5 at an urban site of Chengdu in southwestern China
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- 作者：Jun Tao (1)
Tiantao Cheng (2)
Renjian Zhang (3)
Junji Cao (4)
Lihua Zhu (1)
Qiyuan Wang (4)
Lei Luo (5)
Leiming Zhang (3) (6) - 关键词：water soluble ions ; carbonaceous matters ; trace elements ; enrichment factor ; source apportionment ; mass closure
- 刊名：Advances in Atmospheric Sciences
- 出版年：2013
- 出版时间：July 2013
- 年：2013
- 卷：30
- 期：4
- 页码：1070-1084
- 全文大小：1531KB
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Tiantao Cheng (2)
Renjian Zhang (3)
Junji Cao (4)
Lihua Zhu (1)
Qiyuan Wang (4)
Lei Luo (5)
Leiming Zhang (3) (6)
1. South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou, 510655, China
2. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environment Science and Engineering, Fudan University, Shanghai, 200433, China
3. Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
4. Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710075, China
5. Institute of Plateau Meteorology, China Meteorological Administration, Chengdu, 610071, China
6. Air Quality Research Division, Science and Technology Branch, Environment Canada, Toronto, Canada - ISSN：1861-9533
文摘
PM2.5 aerosols were sampled in urban Chengdu from April 2009 to January 2010, and their chemical compositions were characterized in detail for elements, water soluble inorganic ions, and carbonaceous matter. The annual average of PM2.5 was 165 μg m, which is generally higher than measurements in other Chinese cities, suggesting serious particulate pollution issues in the city. Water soluble ions contributed 43.5% to the annual total PM2.5 mass, carbonaceous aerosols including elemental carbon and organic carbon contributed 32.0%, and trace elements contributed 13.8%. Distinct daily and seasonal variations were observed in the mass concentrations of PM2.5 and its components, reflecting the seasonal variations of different anthropogenic and natural sources. Weakly acidic to neutral particles were found for PM2.5. Major sources of PM2.5 identified from source apportionment analysis included coal combustion, traffic exhaust, biomass burning, soil dust, and construction dust emissions. The low nitrate: sulfate ratio suggested that stationary emissions were more important than vehicle emissions. The reconstructed masses of ammonium sulfate, ammonium nitrate, particulate carbonaceous matter, and fine soil accounted for 79% of the total measured PM2.5 mass; they also accounted for 92% of the total measured particle scattering.