Abstract View
Composition of Isoprene and Nitrate Radical Reaction Products Using FIGAERO-CIMS
TIANCHANG XU, Masayuki Takeuchi, Yuchen Wang, Nga Lee Ng, Georgia Institute of Technology
Abstract Number: 623
Working Group: Aerosol Chemistry
Abstract
Isoprene is one of the most abundant volatile organic compounds (VOC) in the atmosphere emitted from biogenic sources such as vegetations. Secondary organic aerosols (SOA) formed from isoprene reactions play essential roles in affecting global SOA production and budget. Among isoprene’s possible reactions in the atmosphere, its reaction with nitrate radicals (NO3) is an important pathway owing to its high yields of SOA and contribution to gas and particulate organic nitrates. One useful tool to study oxidation product composition is Filter Inlet for Gases and AEROsols coupled to a High Resolution Time-of-Flight Iodide Chemical Ionization Mass Spectrometer (FIGAERO-CIMS) because FIGAERO-CIMS can offer us composition information in both gas and particle phases at the molecular level. In this work, we conduct laboratory chamber experiments with isoprene and NO3 radicals under dark condition. The gas-phase and particle-phase oxidation products are continuously measured by FIGAERO-CIMS over the course of the experiments. SOA yields and gas and particulate organic nitrates are examined and discussed.