气溶胶飞行时间激光质谱仪在机动车尾气检测中的应用

On-line characterization of individual particles from automobile emission by ATOFMS

使用气溶胶飞行时间激光质谱仪(ATOFMS)对机动车排放出的尾气进行在线测量,在排放出的气溶胶单粒子中检测出包括钠、钙、CnHm等在内的有机和无机离子。实验表明可以用钙离子和一些典型的有机质谱峰作为监测机动车尾气的标记,同时说明了此装置实时在线测量机动车尾气成分的可行性,也可以为机动车尾气气溶胶粒子在大气气溶胶中的分配情况进行化学路径跟踪。

Particles sampled directly from the exhaust pipes of a number of vehicles were analyzed using aerosol time-of-flight mass spectrometry （ATOFMS） in real time. Both organic and inorganic chemical species including sodium, calcium, CnHm were observed in individual exhaust particles. Preliminary results suggest that it might be possible to use calcium in combination with more specific organic peaks as a marker for automobile exhaust particles. ATOFMS can also be used as a real-time monitor, characterizing particles produced from vehicles. Furthermore, determination of chemical tracers in individual exhaust particles allows for more accurate source allocation of atmospheric particles.