真空紫外光电离研究柠檬烯氧化生成二次有机气溶胶机理

Secondary organic aerosol (SOA) is an important part of the atmospheric aerosol, which is the research hot issue of air pollution, it could reduce the atmospheric visibility, influent the climate,the environment and human health. Gas phase oxidation of volatile organic matter can produce low-volatile or semi-volatile products, which could lead to form SOA by aggregation, adsorption, absorption of these products into the particle phase. However, the formation mechanism of each system is still not clear. Mainly because that the SOA contains large amounts of organic matter, the concentration of the organic matter is very low, the volatility and nature of different species is also quite different.The real-time online measurement of SOA, and to characterize its composition and to study the formation mechanism of SOA are all great significant. The project proposed will use the established on-line photoionization aerosol mass spectrometer using VUV SR, and combine with the environmental chamber system to simulate the atmospheric oxidation or photooxidation of limonene by OH or O3 to form SOA, to analyze the composition and physical properties of the SOA, and to clarify its generation mechanism. The study can be real-time online testing limonene oxidation or photo-oxidation in the environment chamber to produce the SOA, and the use of synchrotron radiation tuneble photoionization advantages to identify the products, to further explore the SOA formation processes that generated by oxidation or photooxidation of volatile organic compounds. The formation of SOA from oxidation of limonene is very significant.

二次有机气溶胶（SOA）是大气气溶胶的重要组成部分，是大气污染研究的热点问题，它会降低大气能见度，影响气候和环境以及人类健康。SOA 的形成是指气相中的有机物氧化形成的低挥发性或半挥发性产物通过聚集，吸附，吸收到颗粒相中。但对于各个体系的形成机理还没有搞清楚。主要是由于SOA中含有大量有机物，而且大多数有机物的浓度很低，不同物种的挥发性也有较大差异。所以采用实时在线研究SOA对于确定其组分和形成机理具有重要意义。本项目利用已经建立的一套真空紫外同步辐射在线光电离气溶胶质谱仪，结合环境腔系统，模拟大气氧化或光氧化柠檬烯产生SOA,分析产生的SOA的成分及物理特性，阐明其生成机制。该研究可以实时在线检测柠檬烯在环境腔中的氧化或光氧化产生SOA的过程，并且利用同步辐射可调谐光电离的优点来鉴别产物，对进一步探索大气中的挥发性有机物如何形成SOA具有重要的意义。

二次有机气溶胶（SOA）是大气气溶胶的重要组成部分，是大气污染研究的热点问题，它会降低大气能见度，影响气候和环境以及人类健康。SOA 的形成是指气相中的有机物氧化形成的低挥发性或半挥发性产物通过聚集，吸附，吸收到颗粒相中。但对于各个体系的形成机理还没有搞清楚。主要是由于SOA中含有大量有机物，而且大多数有机物的浓度很低，不同物种的挥发性也有较大差异。所以采用实时在线研究SOA对于确定其组分和形成机理具有重要意义。本项目利用已经建立的一套真空紫外同步辐射在线光电离气溶胶质谱仪，结合环境腔系统，模拟大气氧化或光氧化柠檬烯产生SOA,分析产生的SOA的成分及物理特性，阐明其生成机制。该研究可以实时在线检测柠檬烯在环境腔内的氧化或光氧化产生SOA的过程，并且利用同步辐射可调谐光电离的优点来鉴别产物，对进一步探索大气中的挥发性有机物如何形成SOA具有重要的意义。