| 摘要: |
| 于2011—2017年在江苏省南京环境监测中心办公楼顶开展PM2.5监测采样，分析其样品中OC、EC、水溶性离子和20余种无机元素等组分演变特征。结果表明，NO-3、SO2-4、NH+4、OC、EC等是PM2.5的主要组分，且大部分组分值随ρ(PM2.5)降低呈下降趋势；OC在2016—2017年成为占比最大的组分；ρ（NO-3）/ρ（SO2-4）由0.9上升至13，ρ（OC）/ρ（EC）由3.2上升至3.6，均呈持续上升趋势；机动车污染和有机碳污染明显加重，南京大气污染类型从传统煤烟型污染向煤烟型与氧化型污染共同主导的复合型污染转变；K-、Cl-、SO2-4等水溶性离子和痕量元素K、Al、Ca、Na、Mg等值持续下降，说明工业污染减排、燃煤总量控制和污染治理、扬尘管控和秸秆禁烧效果显著。 |
| 关键词: 细颗粒物 水溶性离子 有机碳：元素碳 无机元素 南京市 |
| DOI： |
| 分类号:X831 |
| 文献标识码:B |
| 基金项目:江苏省环境监测科研基金资助项目（201707） |
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| Study on the Evolution Characteristics of Chemical Components in PM2.5in Urban Area of Nanjing |
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PM2.5；Watersoluble ions；OC;EC；Inorganic elements; Nanjing City
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Jiangsu Nanjing Environmental Monitoring Center，Nanjing， Jiangsu，210013 China
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| Abstract: |
| The evolution characteristics of OC, EC, water-soluble ions and more than 20 inorganic elements were analyzed in PM2.5 samples which were collected from the top of office building of Nanjing Environmental Monitoring Center during 2011 to 2017. The results presented that the main components of PM2.5 in Nanjing were NO-3，SO2-4，NH+4，OC，and EC, etc. Most components declined with the decrease of PM2.5 concentration. OC became the major component in 2016—2017. Moreover，ρ（NO-3）/ρ（SO2-4) and ρ（OC）/ρ（EC） showed a rising trend. The ratio of ρ（NO-3）/ρ（SO2-4）raised from 0.9 up to 1.3，while ρ（OC）/ρ（EC） raised from 3.2 up to 3.6. Motor vehicle pollution and organic pollution had significantly aggravated. The air pollution in Nanjing was changing from the traditional soot-type pollution to the combined pollution dominated by both soot-type and oxidation-type pollution. The concentrations of K-，Cl-，SO2-4 and trace elements K，Al，Ca，Na，Mg decreased continuously，which shows that the effect of industrial pollution reduction， coal combustion total amount control and pollution control， dust pollution management and straw burning ban were significant. |
| Key words: PM2.5 Water soluble ions OC EC Inorganic elements Nanjing City |
