摘要
在自制的烟雾腔内,用紫外光照射间-二甲苯、亚硝酸甲酯、一氧化氮和清洁空气的混合物,可以启动间-二甲苯和羟基自由基(OH-)的光氧化反应和一系列的后续反应,产生非挥发性和半挥发性有机化合物.半挥发性有机化合物可以在气态和粒子态之间进行分配,产生二次有机气溶胶粒子.采用实时测量气溶胶粒子粒径大小和化学成分的气溶胶飞行时间质谱仪快速、实时地测量了这些粒子的尺度、它们的分子成分和粒径分布.通过化学分析,得到酚、醛、酮和羧酸等重要的间-二甲苯光氧化产物,为讨论间-二甲苯光氧化反应机理提供了新的信息.
Photooxidation of the aromatic hydrocarbon m-xylene and its subsequent reactions are carried out using UV-irradiation of m-xylene/CH3ONO/NO/air mixtures in a home-made smog chamber.The secondary organic aerosols could form after those oxidation products of semi-volatile organic compounds are partitioned between gas phase and particle phase.The aerosol time-of-flight mass spectrometer(ATOFMS) is used to measure size and molecular composition of individual secondary organic aerosol particle.Size distribution and chemical composition of secondary organic aerosol are obtained in real time.Phenolic compounds,aldehyde,ketone,and organic acid are predominant components of aerosol from the m-xylene.These also provide additional insight into the oxidation mechanism for m-xylene.
出处
《过程工程学报》
CAS
CSCD
北大核心
2006年第z2期133-137,共5页
The Chinese Journal of Process Engineering
关键词
间-二甲苯
光氧化
二次有机气溶胶
烟雾腔
气溶胶飞行时间质谱仪
m-xylene
photooxidation
secondary organic aerosol
smog chamber
aerosol time-of-flight mass spectrometer
