南京北郊春季PM2.5污染特征与成因分析

论文总字数：19718字

目 录

摘要 1

Abstract 2

一．绪论 3

（一）选题的背景和意义 3

（二）国内外研究现状 4

1.研究进展 4

2.碳质成分研究现状 5

3.水溶性离子研究现状 6

二． 实验与研究方法 6

（一）采样 6

1.采样点的选取 6

2.样品采集 7

（二）仪器介绍 7

1.空气样本采集仪器介绍 7

2.碳质组份测定仪器介绍 7

3.水溶性离子测定仪器介绍 8

三．实验结果与讨论 8

（一）污染特征分析 8

2.气象因子对质量浓度的影响 9

（1）降水 9

（2）风速和风向 10

2.OC、EC浓度特征分析 10

（1）OC、EC质量浓度变化 10

（2）OC、EC的相关性分析 11

（3）OC/EC分析以及SOC的估算 11

3.水溶性离子浓度特征分析 12

（1）中水溶性离子的质量浓度水平 12

（2）与的比值分析 14

（3） 及其水溶性离子的相关性分析 15

四． 结论 16

参考文献 16

致谢 18

南京北郊春季PM2.5污染特征与成因分析

张海潇

,China

Abstract

The pollution of fine particles is one of the imminent problem in atmospheric environment field，therefore the pollution and characteristic of fine particles are crucial for human health.The research on and it’s components have far-reaching significance of the treatment of atmospheric aerosols and in-depth understanding of its impact on human health.In this work we choose Nanjing University Of Information Science And Technology which located in Pukou District to have continuous monitoring for the mass concentration of ,and using Model 2001A Thermal Optical Carbon Analyzer to mensurate the concentration of OC and EC,we also using the Ion chromatography analyzer produced by Dionex America to analysis the concentration of water soluble ion.The research results show that In the spring climate conditions in north region, Nanjing, due to the role of the surrounding chemical park and other pollution factors, the weather is more serious pollution. average mass concentration is ．Among them, due to the surrounding chemical plant exhaust gas and automobile exhaust emissions lead to a lot of Precursor substance，after a series of chemical reactions these substance can form many secondary pollutants.At the same time, under the condition of considering the meteorological factors, the analysis shows that the quality concentration is affected by the rain water, wind and other factors. Before the precipitation, the content of the secondary pollutants increased obviously because of the humidity in the air. And after the precipitation, the cleaning effect of the rain is very significant.OC, EC mass concentration change is similar to the ，but the correlation between them is poor, so that we can estimate they are not from the same source of pollution．And by the ratio of OC and EC can come to the conclusion that in the study of carbonaceous aerosols containing secondary organic carbon (SOC)， and the average content of SOC is ．、、accounted for 87% of total water soluble ion.The correlation analysis of water soluble ions showed that the proportion of the two water soluble ions was relatively large,and by calculate / can be determined that the sampling point is more affected by the moving source than the stationary source.

Key word:PM_2.5;organic carbon;elemental carbon;water soluble ion

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