若干芳香族化合物气溶胶单粒子的在线测量

Real-time measurement of several aromatic compound aerosol single particles

通过在自行研制的气溶胶飞行时间激光质谱仪上对苯酚、苯胺、1,3-二氯苯、硝基苯气溶胶单粒子的质谱特征进行了激光解吸附电离飞行时间质谱(laser desorption/ionization time-of-flight mass spectra, LDI-TOFMS)研究,分别得到了它们的质谱图,分析了它们特征谱的形成机理。发现这几种芳香族化合物气溶胶单粒子的LDI-TOFMS谱都是容易优先失去一个电子形成母体离子峰M+,其官能团也极易脱落,这为我们进行有机分子在气溶胶状态下的激光质谱特征研究以及单颗粒大气气溶胶化组成的鉴别提供了基本信息。

Organic compounds containing a variety of functional groups have been analyzed using aerosol time-of-flight laser mass spectrometry designed in our lab. Positive laser des-orption/ionization time-of-flight mass spectra (LDI-TOFMS) and it's formation mechanism have been acquired for phenol, aniline, 1, 3-dichlorobenzene, nitrobenzene. The results show that the single aerosol particles of aromatic compounds can easily lose a electron to form a molecular ion spectrum , and its functional group is liable to disintegrate, too. This can offer some basic information of some aromatic group aerosol particles and the interpretation and analysis method of atmospheric aerosol.