1. Effect of humidity on the composition of isoprene photooxidation secondary organic aerosol
- Author
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Serguei Nizkorodov, Julia Laskin, Tran B. Nguyen, Alexander Laskin, and Patrick J. Roach
- Subjects
Atmospheric Science ,atmospheric chemistry ,alkoxy radicals ,h-atom transfer ,Inorganic chemistry ,alpha-pinene ,lcsh:Chemistry ,chemistry.chemical_compound ,heterogeneous reactions ,Physical Sciences and Mathematics ,Relative humidity ,Hydrogen peroxide ,Chemical composition ,Isoprene ,particulate matter ,Glycolaldehyde ,Hydroxyacetone ,mass-spectrometry ,lcsh:QC1-999 ,Aerosol ,lcsh:QD1-999 ,chemistry ,hygroscopic properties ,chemical-composition ,lcsh:Physics ,Water vapor ,accretion reactions ,Nuclear chemistry - Abstract
The effect of relative humidity (RH) on the composition and concentrations of gas-phase products and secondary organic aerosol (SOA) generated from the photooxidation of isoprene under high-NOx conditions was investigated. Experiments were performed with hydrogen peroxide as the OH precursor and in the absence of seed aerosol. The relative yields of most gas-phase products were the same regardless of initial water vapor concentration with exception of hydroxyacetone and glycolaldehyde, which were considerably affected by RH. A significant change was observed in the SOA composition, with many unique condensed-phase products formed under humid (90 % RH) vs. dry (
- Published
- 2011
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