Jianmin Chen
Fudan University, China
Title: Tropospheric multiphase chemistry elevated by diverse mass-spectrometric techniques
Biography
Biography: Jianmin Chen
Abstract
Recently, multifarious mass-spectrometric techniques (MAF) have been rapidly developed and applied to tropospheric multiphase chemistry. They play an important role in the studies of secondary aerosol formation, chemical components, atmospheric oxidation, haze episodes and cloud condensation nuclei (CCN), which impact many aspects of air quality, health and global climate. Here, a variety of MST is introduced to investigate multiphase chemistry in ambient air and laboratory studies, (i) secondary organic aerosols (SOA) formation was investigated by single particle ToF mass spectrometry from α-pinene–ozone system with seed aerosols in an aerosol chamber; (ii) particulate nitrate formation was firstly explored by aerosol ToF mass spectrometry. High molecular weight species were observed in urban Shanghai aerosols; (iii) desorption electrospray ionization mass spectrometry has been applied for the first time to the analysis of SVOCs in atmospheric aerosols and only a 1 µL droplet sample is needed for analysis without or with little pretreatment; (vi) UHPLC coupled with Orbitrap MS was used in PM2.5 analysis. About 200 formulas of organosulfates, were found including dozens of formulas of nitrooxy- organosulfates with various numbers of isomers. It is increasing interest in MST combined with hygroscopic and optical techniques to explore atmospheric process and radiative forcing.