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Characteristics of chemical components in PM2.5 at a plateau city, South-west China

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Abstract

A sampling campaign including summer, autumn and winter of 2014 and spring of 2015 was accomplished to obtain the characteristic of chemical components in PM2.5 at three sites of Kunming, a plateau city in South-west China. Nine kinds of water-soluble inorganic ions (WSI), organic and element carbon (OC and EC) in PM2.5 were analyzed by ion chromatography and thermal optical reflectance method, respectively. Results showed that the average concentrations of total WSI, OC and EC were 22.85±10.95 µg·m-3, 17.83±9.57 µg·m-3 and 5.11±4.29 µg·m-3, respectively. They totally accounted for 53.0% of PM2.5. Secondary organic and inorganic aerosols (SOA and SIA) were also assessed by the minimum ratio of OC/EC, nitrogen and sulfur oxidation ratios. The annual average concentrations of SOA and SIA totally accounted for 28.3% of the PM2.5 concentration. The low proportion suggested the primary emission was the main source of PM2.5 in Kunming. However, secondary pollution in the plateau city should also not be ignorable, due to the appropriate temperature and strong solar radiation, which can promote the atmospheric photochemical reactions.

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Authors and Affiliations

  1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China

    Jianwu Shi, Xiang Ding, Yue Zhou, Ran You, Lu Huang, Jiming Hao, Xinyu Han & Ping Ning

  2. School of Environment, Tsinghua University, Beijing, 100084, China

    Jiming Hao

  3. Yunnan Environmental Monitoring Center, Kunming, 650000, China

    Feng Xiang & Ze Shi

  4. Kunming Environmental Monitoring Center, Kunming, 650228, China

    Jian Yang

Authors
  1. Jianwu Shi
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  2. Xiang Ding
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  3. Yue Zhou
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  4. Ran You
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  5. Lu Huang
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  6. Jiming Hao
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  7. Feng Xiang
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  8. Jian Yang
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  9. Ze Shi
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  10. Xinyu Han
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  11. Ping Ning
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Correspondence to Ping Ning.

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Shi, J., Ding, X., Zhou, Y. et al. Characteristics of chemical components in PM2.5 at a plateau city, South-west China. Front. Environ. Sci. Eng. 10, 4 (2016). https://doi.org/10.1007/s11783-016-0841-2

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  • DOI: https://doi.org/10.1007/s11783-016-0841-2

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