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Molecular Composition and Volatility of Organic Aerosol in the Southeastern U.S.: Implications for IEPOX Derived SOA.

Journal article
Authors F D Lopez-Hilfiker
C Mohr
E L D'Ambro
Anna Lutz
T P Riedel
C J Gaston
S Iyer
Z Zhang
A Gold
J D Surratt
B H Lee
T Kurten
W W Hu
J Jimenez
Mattias Hallquist
J A Thornton
Published in Environmental science & technology
Volume 50
Issue 5
Pages 2200-2209
ISSN 1520-5851
Publication year 2016
Published at Department of Chemistry and Molecular Biology
Pages 2200-2209
Language en
Subject categories Chemical Sciences, Analytical Chemistry, Organic Chemistry, Earth and Related Environmental Sciences, Climate Research, Environmental Sciences, Environmental chemistry, Meteorology and Atmospheric Sciences


We present measurements as part of the Southern Oxidant and Aerosol Study (SOAS) during which atmospheric aerosol particles were comprehensively characterized. We present results utilizing a Filter Inlet for Gases and AEROsol coupled to a chemical ionization mass spectrometer (CIMS). We focus on the volatility and composition of isoprene derived organic aerosol tracers and of the bulk organic aerosol. By utilizing the online volatility and molecular composition information provided by the FIGAERO-CIMS, we show that the vast majority of commonly reported molecular tracers of isoprene epoxydiol (IEPOX) derived secondary organic aerosol (SOA) is derived from thermal decomposition of accretion products or other low volatility organics having effective saturation vapor concentrations <10(-3) μg m(-3). In addition, while accounting for up to 30% of total submicrometer organic aerosol mass, the IEPOX-derived SOA has a higher volatility than the remaining bulk. That IEPOX-SOA, and more generally bulk organic aerosol in the Southeastern U.S. is comprised of effectively nonvolatile material has important implications for modeling SOA derived from isoprene, and for mechanistic interpretations of molecular tracer measurements. Our results show that partitioning theory performs well for 2-methyltetrols, once accretion product decomposition is taken into account. No significant partitioning delays due to aerosol phase or viscosity are observed, and no partitioning to particle-phase water or other unexplained mechanisms are needed to explain our results.

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