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Hi Everyone,
SOCAAR is pleased to announce our Seminar for December 2019,
Wednesday, December 4, 2019
3:00 - 4:00PM
Wallberg Building, 200 College Street,
Room 215
Jay G. Slowik
Research Scientist
Laboratory of Atmospheric Chemistry
Paul Scherrer Institute
Switzerland
Atmospheric Aerosol Analysis by Online Extractive Electrospray Ionization Mass Spectrometry
Mass spectrometry is a powerful tool for the analysis of aerosol composition. However, tradeoffs typically exist between the loss of chemical information due to thermal decomposition and/or ionization-induced
fragmentation on the one hand, and lower time resolution and/or separated collection/analysis stages on the other. We address these issues through the development of an extractive electrospray ionization time-of-flight mass spectrometer (EESI-TOF), which provides
online, highly time-resolved measurements of aerosol composition without significant decomposition or fragmentation. Further, the EESI-TOF provides a versatile sampling/ionization framework, as by simply changing the composition of the primary spray and mass
spectrometer polarity, the instrument can be configured to optimize detection of different organic fractions or water-soluble metals, while the sampling inlet can be configured to allow separate detection of the gas and particle phase. Two applications of
the EESI-TOF are presented. First, we demonstrate rapid intra-particle decomposition reactions in secondary organic aerosol generated from the dark ozonolysis of α-pinene, as well as further reaction on the exposure of the aerosol to visible light. Second,
we explore the sources and processes governing SOA composition in complex urban environments.
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