南京不同污染程度下气溶胶化学组分特征

论文总字数：24064字

目 录

摘要 III

Abstract: IV

1引言 1

2材料和方法 2

2.1实验地点和时间 2

2.2采样仪器与实验方法 2

3结果与讨论 2

3.1 PM_2.5变化特征 2

3.2水溶性离子污染分析 5

3.2.1水溶性离子变化特征 5

3.2.2流动源和固定源的分析 7

3.2.3水溶性离子相关性分析 7

3.3OC、EC污染分析 9

3.3.1 OC、EC及总碳气溶胶（TCA）浓度变化特征 9

3.3.2二次有机碳（SOC）估算 11

3.3.3 OC与EC的相关性及来源分析 13

4结论 14

参考文献 15

致谢 19

南京不同污染程度下气溶胶化学组分特征

黄洁 20141367073

, China

Abstract: In order to learn the mass concentration levels, pollution characteristics and the sources of atmospheric fine particles’ chemical components in the northern suburb of Nanjing under different air quality levels, this project uses KC-120H samplers collects aerosol samples in the northern suburb of Nanjing. Then I respectively measure the mass concentration of water soluble ions and carbon particulate matter of the sample in these three levels of air quality: clean, light/moderate pollution and heavy pollution. The results of the analysis that combine with the weather condition show that the highest mass concentration of PM_2.5 is 241.36μg m^-3. It appears in heavy pollution days, and it is 0.9 times higher than light/moderate pollution and 2.9 times higher than clear days. The change of meteorological elements is an important reason for the change of air quality. NH₄ , NO₃^- and SO₄^2- are the main inorganic components, their daily average mass concentration reaches the highest level in heavy pollution days, and the highest mass concentration of these three ions are 2.8, 5.5 and 1.9 times higher than the clear days, (NH₄) ₂SO₄ and NH₄NO₃ are the main existing forms. The main source of air pollutant is flow source in the study period. Whether OC or EC, the lowest mass concentration both appears in the clear days. Their highest mass concentrations are 63.2 μgm^-3and 14.3 μgm^-3respectively, and they all appear in heavy pollution days. The average concentration of secondary organic carbon reaches the highest level in heavy pollution, its highest concentration is 8.93 μg m^-3. The main sources of carbon in the study period are coal burning, automobile exhaust and road dust.

Keywords: aerosol; PM_2.5; Water soluble ions; Organic carbon; Elemental carbon; Nanjing

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