硫酸铵气溶胶对甲苯-NOx-空气体系光化学反应的影响

利用大气模拟烟雾箱,研究了硫酸铵气溶胶对甲苯-NO_x-空气体系光化学反应的影响.结果表明,硫酸铵作为气溶胶种子,其存在可以加快反应过程中颗粒物（particle matter, PM）的生成速度,并提高甲苯的气溶胶产率.在高浓度的硫酸铵气溶胶种子条件下,其初始浓度对反应过程中NO_x、NO和O₃的浓度变化没有明显的影响,但对二次有机气溶胶（secondary organic aerosol, SOA）的生成有显著影响.在硫酸铵气溶胶种子浓度小于160 μg·m^-3时,SOA的产率随初始气溶胶种子浓度的增大而增大,从最小7.2％到最大11.7％,其增幅超过60％.

Effect of Ammonium Sulfate Aerosol on the Photochemical Reaction of Toluene/NOx/Air Mixture

The effect of ammonium sulfate aerosol on the photochemical reaction of toluene/NO(x)/air mixture was evaluated with Tsinghua Smog Chamber facility. The results indicate that the presence of concentrated preexisting ammonium sulfate aerosol shortens the time to reach maximum PM (particle matter) concentration and increases the aerosol yield of toluene. And under the presence of high concentrated ammonium sulfate aerosol seed, the concentration of aerosol does not have significant effects on NO(x), NO and O3 variation, but affects the formation of secondary organic aerosol (SOA). The SOA yield increases with the increasing initial ammonium sulfate seed concentration (< 160 microg x m(-3)). From the minimum 7.2% to the maximum 11.7%, the percentage increase of SOA yield is more than 60%.