OH自由基启动异戊二烯光氧化反应时间演化特性的研究  

Investigation of reaction time evolution of OH-initiated isoprene photooxidation experiment

作　　者：潘刚 胡长进 王振亚[1] 程跃 刘志 郑晓宏 顾学军 赵卫雄 张为俊[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所大气物理化学研究室,安徽合肥230031

出　　处：《量子电子学报》2013年第3期275-279,共5页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(10979061;40975080);安徽省自然科学基金(1208085MD59);中国科学院知识创新工程重要方向性项目(KJCX2-YW-N24);中科院安徽光学精密机械研究所所长基金(YO3AG31147)资助

摘　　要：利用烟雾箱反应装置,开展了OH自由基启动的异戊二烯光氧化生成二次有机气溶胶(SOA)反应的研究。用质子转移质谱仪(PTR-MS)监测反应物异戊二烯浓度、气相产物异丁烯醛和甲基乙烯酮(m/2=70)浓度随反应时间的变化;用扫描电迁移率粒径谱仪(SMPS)监测二次有机气溶胶产生和生长过程;用同步辐射光电离质谱仪(SRPIMS)检测不同反应时刻的光氧化气相产物的质谱。实验数据显示随着反应时间的增长,异戊二烯浓度逐渐减少,主要气相产物的浓度逐渐增加,SOA逐渐产生和增长;当异戊二烯快要消耗完时,SOA仍然继续增长。它表明由于有机气溶胶粒子的产生,主要的气相产物表面上发生的后续反应或者非均相反应产物对SOA的生长具有促进作用。OH-initiated photooxidation reaction of isoprene was performed in the home-made smog cham- ber. Isoprene and important gas phase products （methacrolein and methyl vinyl ketone （m/z -- 70） were monitored real time by proton-transfer-reaction mass spectrometer （PTR-MS）, and formation and growth of secondary organic aerosol （SOA） were measured by scanning mobility particles sizer （SMPS）. Photoioniza- tion mass spectroscopy of important gas phase products from this photooxidation of isoprene was obtained using synchrotron radiation photoionization mass spectrometry （SRPIMS）. It is shown that with increase of reaction time, isoprene concentration reduced gradually, and SOA began to form and grow. When isoprene was depleted nearly, the mass concentration of SOA was still kept to grow, which indicated that heteroge- neous reaction of the main gas phase products occurred on the surface of particles should be responsible for the growth of SOA.

关 键 词：光谱学 异戊二烯 OH自由基 烟雾箱 光氧化产物 

分 类 号：O437[机械工程—光学工程]