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《China Environmental Science》 2008-06
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Pollution characteristics of PM_(2.5) and its main components in Tianjin winter atmosphere

LI Wei-fang1, BAI Zhi-peng1, WEI Jing-dong1, LIU Ai-xia2, ZHAO Yu-jie3, JIN Tao-sheng1 (1.State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China;2.Tianjin City Institute of Meteorological Science, Tianjin 300074, China;3.Tianjin Tanggu Meteorological Bureau, Tianjin 300457, China)  
The pollution characteristics of PM2.5 and its water-soluble inorganic ion and carbonaceous component in urban, industrial and coastal areas of Tianjin in winter were studied. The winter-time PM2.5 pollution was serious with an average concentration of 223μg/m3. Organic matter, sulfate and elemental carbon were the most abundant species constituting about 23.4%, 13.1% and 12.8% of the total PM2.5 mass, respectively. The spatial distribution of PM2.5 concentration and its chemical components was relatively even, but pollution of carbonaceous matter was most serious in the industrial area due to local emission sources. SO42-、NO3-、Cl-、NH4+ and K+ accounted for about 90% of the total ions, cation and anion did not reach equilibrium with an excess of acidic anion. The concentration ratio of organic carbon and elemental carbon was 1.4, lower than any other domestic cities. Most of the measured organic carbon was from primary emission sources, and secondary organic carbon content was about 27%~37%. Vehicle exhaust and coal combustion were the major emission sources of PM2.5 in Tianjin and the sea salt particle contribution was little.
【Fund】: 国家自然科学基金资助项目(20677030);; 天津市科技发展计划项目(06YFSYSF02900)
【CateGory Index】: X513
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