OH自由基启动异戊二烯光氧化反应时间演化特性的研究?

J4 ›› 2013, Vol. 30 ›› Issue (3): 275-279.

OH自由基启动异戊二烯光氧化反应时间演化特性的研究?

潘刚,胡长进,王振亚,程跃,刘志,郑晓宏,顾学军,赵卫雄,张为俊

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

收稿日期:2012-05-02 修回日期:2012-05-20 出版日期:2013-05-28 发布日期:2013-05-06
通讯作者: 张为俊（1982-），安徽巢湖人，博士，研究员，博士生导师，主要从事环境微量污染物检测方法及污染机理研究。 E-mail:wjzhang@aiofm.ac.cn.
作者简介:潘刚（1982-）安徽马鞍山人，博士生，主要从事大气光化学和二次有机气溶胶研究。Email：pangang@aiofm.ac.cn
基金资助:
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

Investigation of reaction time on OH-initiated isoprene photooxidation experiment

PAN Gang, HU Chang-jin, WANG Zhen-ya, CHENG Yue, LIU Zhi, ZHENG Xiao-hong, GU Xue-jun, ZHAO Wei-xiong, ZHANG Wei-jun

Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

Received:2012-05-02 Revised:2012-05-20 Published:2013-05-28 Online:2013-05-06

摘要/Abstract

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/z=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。

关键词: 光谱学, 异戊二烯, OH自由基, 烟雾箱, 光氧化产物

Abstract: OH – initiated photooxidation reaction of isoprene was performed in our home-made smog. 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 SOA were measured by scanning mobility particles sizer (SMPS). Photoionization 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, SOA began to produce and grow; when isoprene was depleted nearly, the mass concentration of SOA was still kept to grow, which indicated that heterogeneous reaction of the main gas phase products occurred on the surface of particles should be responsible for the growth of SOA.

Key words: spectroscopy, isoprene, OH free radical, smog chamber, photooxidation products

中图分类号:

O437

潘刚胡长进王振亚程跃刘志郑晓宏顾学军赵卫雄张为俊. OH自由基启动异戊二烯光氧化反应时间演化特性的研究?[J]. J4, 2013, 30(3): 275-279.

PAN Gang, HU Chang-jin, WANG Zhen-ya, CHENG Yue, LIU Zhi, ZHENG Xiao-hong, GU Xue-jun, ZHAO Wei-xiong, ZHANG Wei-jun. Investigation of reaction time on OH-initiated isoprene photooxidation experiment[J]. J4, 2013, 30(3): 275-279.

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