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2016, Volume 10, Issue 5

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Frontiers of Environmental Science & Engineering >> 2016, Volume 10, Issue 5 doi: 10.1007/s11783-016-0841-2

Characteristics of chemical components in PM

. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.. School of Environment, Tsinghua University, Beijing 100084, China.. Yunnan Environmental Monitoring Center, Kunming 650000, China.. Kunming Environmental Monitoring Center, Kunming 650228, China

Available online: 2016-05-09
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Abstract

The mass concentrations of PM were studied at a plateau city. Seasonal and spatial variation of chemical components in PM were analyzed. Primary emissions were the main contributors of PM . A sampling campaign including summer, autumn and winter of 2014 and spring of 2015 was accomplished to obtain the characteristic of chemical components in PM 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 PM 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 , 17.83±9.57 μg·m and 5.11±4.29 μg·m , respectively. They totally accounted for 53.0% of PM . 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 PM concentration. The low proportion suggested the primary emission was the main source of PM 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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