Chemical composition of PM2.5 at an urban site of Chengdu in southwestern China

被引:94
|
作者
Tao Jun [1 ]
Cheng Tiantao [2 ]
Zhang Renjian [3 ]
Cao Junji [4 ]
Zhu Lihua [1 ]
Wang Qiyuan [4 ]
Luo Lei [5 ]
Zhang Leiming [3 ,6 ]
机构
[1] Minist Environm Protect, South China Inst Environm Sci, Guangzhou 510655, Guangdong, Peoples R China
[2] Fudan Univ, Shanghai Key Lab Atmospher Particle Pollut & Prev, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China
[3] Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Res Temperate East A, Beijing 100029, Peoples R China
[4] Chinese Acad Sci, Inst Earth Environm, Xian 710075, Peoples R China
[5] China Meteorol Adm, Inst Plateau Meteorol, Chengdu 610071, Peoples R China
[6] Environm Canada, Air Qual Res Div, Sci & Technol Branch, Toronto, ON, Canada
基金
中国国家自然科学基金;
关键词
water soluble ions; carbonaceous matters; trace elements; enrichment factor; source apportionment; mass closure; PEARL RIVER-DELTA; SOLUBLE IONIC COMPOSITION; PARTICULATE MATTER; TRACE-ELEMENTS; PARTICLES PM1; AEROSOL; EXTINCTION; VISIBILITY; POLLUTION; SHANGHAI;
D O I
10.1007/s00376-012-2168-7
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
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 mu g m(-3), 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.
引用
收藏
页码:1070 / 1084
页数:15
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