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通过自制的烟雾腔系统研究羟基启动的异戊二烯光解形成二次有机气溶胶(SOA)过程中环境因素的影响.使用气溶胶粒径光谱仪测量了SOA的粒径分布,通过光解实验研究了光照时间、反应物浓度以及CH3ONO浓度对异戊二烯光解形成SOA的影响.结果表明,异戊二烯光解形成的SOA空气动力学直径在0.4mm~1.4mm之间,这些粒子的直径小于2.5μm的微细粒子很容易沉积在人体肺泡内,对人体健康产生很大危害;不管是SOA粒子的粒子数浓度还是质量数浓度都随着反应时间的增长、光照强度的增强和反应物浓度的增加而增加.该研究为大气颗粒物排放源的外场测量提供了非常有用的信息.
The influence of environmental factors on the formation of secondary organic aerosol (SOA) by photodecomposition of hydroxyl-initiated isoprene was investigated by a homemade smoke chamber system.The particle size distribution of SOA was measured by aerosol particle size spectrometer The effects of light irradiation time, concentration of reactants and CH3ONO concentration on the formation of SOA by photodegradation of isoprene were studied.The results showed that the aerodynamic diameter of SOA formed by photodegradation of isoprene was between 0.4mm and 1.4mm, Of the diameter of less than 2.5μm fine particles can easily be deposited in the human alveoli, human health have a great harm; whether the number of particles or mass concentration of SOA particles with the reaction time, the increase in light intensity and response This study provides very useful information for the field measurement of atmospheric particulate emissions.