11月12日（周四）上午9:00 Nobuyuki Takegawa教授2015年學術報告之三十八“Particle analysis by online mass spectrometry”

報告題目：Particle analysis by online mass spectrometry

報告  人：Nobuyuki Takegawa 教授

日本東京都立大學化學系（Tokyo Metropolitan University）教授

時    間：2015年11月12日（周四）上午9:00-10:30

地    點：太阳集团app首页南校區地環大樓B401課室

主    持：趙軍 教授

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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.