沈阳市春夏季PM_(2.5)中有机碳和元素碳污染特征及来源分析
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摘要
通过分析沈阳市环境空气春夏季PM_(2.5)中有机碳和元素碳质量浓度,研究环境空气PM_(2.5)中有机碳、元素碳的污染特征。结果表明,沈阳城区夏季采样期间大气扩散条件良好,EC和OC质量浓度降低;春季OC与EC相关性较好,沈阳城区春季碳质气溶胶污染源来源相对一致;对8个碳组分进行主成分分析,发现春夏季碳组分主要来源于汽油车尾气排放、生物质和煤炭燃烧排放以及道路扬尘;春夏季SOC的平均质量浓度分别是2. 04～3. 77μg/m~3和1. 84～3. 27μg/m~3,二次污染程度较为严重;春季K~+与OC、EC、SOC之间的相关性较好,说明K~+与OC、EC、SOC具有一定的同源性。
The pollution characteristics of organic carbon and elemental carbon in PM_(2.5)were studied by analyzing the mass concentration of organic carbon and elemental carbon during spring and summer in Shenyang.The results showed that the favorable atmospheric diffusion conditions during summer reduced the mass concentrations of EC and OC.There was a good correlation between OC and EC in spring,and the pollution sources in Shenyang area were relatively consistent.Based on the principal component analysis of eight carbon components,it was found that the carbon components in spring and summer were from gasoline vehicle exhaust emissions,biomass and coal combustion emissions,and road dust.The average mass concentrations of SOC in spring and summer were 2.04～3.77 g/m~3and 1.84～3.27 g/m~3,respectively and the secondary pollution was relatively serious.The correlation between K~+and OC,EC or SOC in spring was better,indicating that K~+had the certain homology with OC,EC and SOC.
The pollution characteristics of organic carbon and elemental carbon in PM_(2.5)were studied by analyzing the mass concentration of organic carbon and elemental carbon during spring and summer in Shenyang.The results showed that the favorable atmospheric diffusion conditions during summer reduced the mass concentrations of EC and OC.There was a good correlation between OC and EC in spring,and the pollution sources in Shenyang area were relatively consistent.Based on the principal component analysis of eight carbon components,it was found that the carbon components in spring and summer were from gasoline vehicle exhaust emissions,biomass and coal combustion emissions,and road dust.The average mass concentrations of SOC in spring and summer were 2.04～3.77 g/m~3and 1.84～3.27 g/m~3,respectively and the secondary pollution was relatively serious.The correlation between K~+and OC,EC or SOC in spring was better,indicating that K~+had the certain homology with OC,EC and SOC.
引文
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[7]Chow J C,Watson J G,Kuhns H,et al.Source profiles for industrial,mobile,and area sources in the Big Bend Regional Aerosol Visibility and Observational study[J].Chemosphere,2004,54(2):185-208.
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