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Title: Formation and aging of secondary organic aerosol from toluene: changes in chemical composition, volatility, and hygroscopicity

Journal Article · · Atmospheric Chemistry and Physics (Online)
 [1];  [2];  [3];  [3];  [2];  [4]
  1. Univ. of Texas, Austin, TX (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  3. Georgia Inst. of Technology, Atlanta, GA (United States)
  4. Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Patras, Patras (Greece)

Secondary organic aerosol (SOA) is transformed after its initial formation, but this chemical aging of SOA is poorly understood. Experiments were conducted in the Carnegie Mellon environmental chamber to form secondary organic aerosol (SOA) from the photo-oxidation of toluene and other small aromatic volatile organic compounds (VOCs) in the presence of NOx under different oxidizing conditions. The effects of the oxidizing condition on organic aerosol (OA) composition, mass yield, volatility, and hygroscopicity were explored. Higher exposure to the hydroxyl radical resulted in different OA composition, average carbon oxidation state (OSc), and mass yield. The OA oxidation state generally increased during photo-oxidation, and the final OA OSc ranged from –0.29 to 0.16 in the performed experiments. The volatility of OA formed in these different experiments varied by as much as a factor of 30, demonstrating that the OA formed under different oxidizing conditions can have a significantly different saturation concentration. In conclusion, there was no clear correlation between hygroscopicity and oxidation state for this relatively hygroscopic SOA.

Research Organization:
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); EPA STAR Program; National Science Foundation (NSF). Major Research Instrumentation; Wallace Research Foundation
Grant/Contract Number:
DESC0007075; SC0007075
OSTI ID:
1201024
Alternate ID(s):
OSTI ID: 1326380
Journal Information:
Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Vol. 15 Journal Issue: 14; ISSN 1680-7324
Publisher:
Copernicus Publications, EGUCopyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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