苯系物二次有机气溶胶老化产物的质谱研究

项目名称： 苯系物二次有机气溶胶老化产物的质谱研究

项目编号： No.41305109

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 黄明强

作者单位： 厦门大学

项目金额： 25万元

中文摘要： 来源于汽车尾气排放的苯系物大气光氧化反应形成的二次有机气溶胶(SOA)粒子在大气中会持续老化，产生吸湿性、毒性更大，消光能力更强的粒子。这些粒子能散射太阳辐射, 降低大气可见度, 危害人类健康，SOA粒子的老化过程是大气化学研究领域的一个重要课题。本项目针对我国城市大气同时受汽车尾气和无机细粒子交叉污染的特点，选择苯系物SOA为研究体系，利用基于模糊C均值分析系统的气溶胶激光飞行时间质谱联用的烟雾腔系统，开展苯系物SOA老化标记产物的质谱研究，考察不同类型、浓度、湿度和酸度的无机细粒子对SOA老化产物的影响，确定SOA老化产物与无机细粒子的类型、浓度、湿度和酸度的关系及规律。这将为气溶胶激光飞行时间质谱仪对SOA的监测和来源指认提供实验依据。同时利用Gaussian和TheRate 软件进行SOA老化标记产物形成机理理论计算研究，为减少和控制我国城市大气PM 2.5细粒子污染提供科学依据。

中文关键词： 苯系物；二次有机气溶胶；老化；质谱；无机细粒子

英文摘要： Secondary organic aerosol (SOA) particles formed from photooxidation of aromatic hydrocarbons which emission from motor vehicle exhaust can undergo continuous physical and chemical processing, commonly called aging. The aged SOA particles have greater hygroscopicity, toxicity, and optical extinction ability. They are believed to affect climate, visibility and health. The aging process of SOA is currently a focus of research interest in the field of atmospheric chemistry. In view of the backgroud of the cross contamination of motor vehicle exhaust and atmospheric fine inorganic particles in China's urban atmosphere, this project will investigate the formation of SOA particles from OH-initiated oxidation of aromatic hydrocarbons in the photochemical smog chamber with aid of aerosol laser time-of-flight mass spectrometer coupled with Fuzzy C-Means clustering algorithm. The focuses will be lied on the mass spectrometric characterization of marker products for aging of aromatic SOA at the presence of NOx. The relationship between the products for aging of aromatic SOA and the component，concentration, humidity，acidity of inorganic fine particles will also be determined. These works would provide experimental basis for aerosol laser time-of-flight mass spectrometer using for monitoring the SOA particles. At the same

英文关键词： aromatic hydrocarbons；secondary organic aerosol；aging；mass spectra；inorganic fine particles