AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Emissions of IVOC and SVOC from Mobile Sources Using Online Electron Impact Mass Spectrometry
JONATHAN FRANKLIN, Eben Cross, Jesse Kroll, Massachusetts Institute of Technology
Abstract Number: 321 Working Group: Combustion
Abstract Intermediate-volatility organic compounds (IVOCs) and semivolatile organic compounds (SVOCs) are efficient precursors to secondary organic aerosol (SOA). However, a detailed understanding of such compounds in the atmosphere has been limited by the lack of fast and reliable measurements targeting I/SVOCs. In order to better understand the emissions of I/SVOCs from mobile sources, here we utilize a recently-developed online electron impact mass spectrometric (EI-MS) technique to characterize the emissions from multiple engines. This instrument targets I/SVOCs by cryo-trapping samples and then thermally desorbing them into a high-resolution time-of-flight mass spectrometer. The mass spectrometer not only quantifies the volatility-separated sample, but also provides ensemble chemical composition (e.g., elemental ratios) with high time resolution, on the order of 10-15 minutes. I/SVOC emissions from both gasoline and diesel fuel engines have been measured as a function of engine operating state and the results will be intercompared with other co-located I/SVOC measurement techniques.