卷烟主流烟气中几种醛酮的光电离质谱研究

Photoionization Mass Spectrometric Study on Several Aldehydes and Ketones in Cigarette Mainstream Smoke

为了对卷烟主流烟气中的成分进行定性和定量检测,利用同步辐射光电离-飞行时间质谱装置,对卷烟主流烟气气相成分中的甲醛、乙烯酮、乙醛、丙醛和丙酮进行研究。通过实时获得烟气在不同光子能量下的质谱图,可以获得这些成分的质荷比信息;改变光子能量,对潜在的醛、酮质谱峰扫描光电离效率曲线,与其标准光电离曲线和电离能比对,可以进行准确的定性。

Formaldehyde, ketene, acetaldehyde, propanal and acetone in the gas phase of cigarette mainstream smoke were studied by synchrotron photoionization/time-of-flight mass spectrometry （TOF-MS）. The mass-to-charge ratios （m/z） of these aldehydes and ke- tones can be obtained from photoionization mass spectra at different photon energies. More- over, by tuning photon energies, the photoionization efficiency （PIE） curves of these com- pounds can be measured. Hence, structural identification can be fulfilled by comparing the measured PIE curves and ionization energies （IEs） with standard photoionization cross sec- tions and IEs.