11月12日（周四）上午9:00 Nobuyuki Takegawa教授2015年学术报告之三十八“Particle analysis by online mass spectrometry”

报告题目：Particle analysis by online mass spectrometry

报告  人：Nobuyuki Takegawa 教授

日本东京都立大学化学系（Tokyo Metropolitan University）教授

时    间：2015年11月12日（周四）上午9:00-10:30

地    点：中山大学南校区地环大楼B401课室

主    持：赵军 教授

欢迎广大师生参加!

摘要： 

Recent advances in online mass spectrometric analyzers have largely improved our understanding of sources and processes of ambient and laboratory-generated aerosol particles.  We have developed a new instrument laser induced incandescence - mass spectrometric analyzer (LII-MS) for online measurement of aerosol chemical compositions with respect to the mixing state of black carbon (BC) (Miyakawa et al. 2014).  The LII-MS consists of a tandem series of a LII chamber to detect and vaporize BC-containing particles and a particle trap laser desorption mass spectrometer (PT-LDMS) (Takegawa et al. 2012).  The PT-LDMS collects aerosol particles transferred from the LII chamber and quantify the chemical compositions.  A newly designed collection probe coupled with a sheath-air inlet nozzle of the LII chamber enables high throughput of aerosol particles without significant dilution.  Total aerosol particles can be analyzed in the PT-LDMS by turning off the laser (MS mode), while aerosol particles externally-mixed with BC can be analyzed by turning on the laser (LII-MS mode).  The difference in the PT-LDMS signals between the MS and LII-MS modes yields the chemical composition of materials internally-mixed with BC. The performance of the developed instrument has been evaluated in the laboratory and ambient measurements in Tokyo.  Further improvements of the LII-MS and possible collaborations with Prof. Zhao group will be discussed.