AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
SOA Potential Formation from Whole Gasoline
CHIA-LI CHEN, Ping Tang, Lijie Li, David R. Cocker III, University of California, Riverside
Abstract Number: 278 Working Group: Aerosol Chemistry
Abstract The objective of this study is to investigate the SOA potential formation from whole gasoline vapor under varying NO$_x conditions. Odum et al. (1997) performed chamber experiments with 12 different reformulated gasolines, and their results showed that SOA formation from atmospheric oxidation of these fuels was dominated by the aromatic content of the fuel. However, these experiments were conducted at relatively high concentrations of VOC and NO$_x. Further, the U.S. EPA and CARB has continued to promulgate standards for reformulated and conventional gasolines including increasing oxygenate content while reducing sulfur, olefins, and aromatics. The SOA formation impact from gasoline vapor is expected to differ from previous studies as the chemical composition and our understanding of the relationship between particle formation and atmospheric reactivity has evolved. In this work, chamber experiments are designed with series of aromatics and n-alkanes from gasoline to evaluate the atmospheric potential of SOA formation with emissions from whole gasoline vapors. Winter and summer fuel blends representative of Southern California are selected to be evaluated from the SOA formation from whole gasoline at the UCR CE-CERT environmental chamber. The characteristics of SOA formation are identified by Volatility Tandem Differential Mobility Analyzer (VTDMA), Aerosol Particle mass Analyzer (APM )-SMPS and High-Resolution Time-of-Fight Aerosol Mass Spectrometry (HR-ToF-AMS) for particle volatility, density, and chemical composition, respectively. The SOA yields of different blend gasolines are evaluated with the PM-SAPRC model, two-product model and volatility basis set. Preliminary result shows that the SOA yield from winter gasoline photoxidation is 5.8% ~8.5% at aerosol mass loading less than 10 µg/m$^3. This presentation will discuss the ability of these approaches of estimate SOA formation from fuel mixtures from chamber results of individual SOA precursors.