Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 27, 2016 | Published + Supplemental Material
Journal Article Open

A note on the effects of inorganic seed aerosol on the oxidation state of secondary organic aerosol-α-Pinene ozonolysis


We compare the oxidation state and molecular composition of α-pinene-derived secondary organic aerosol (SOA) by varying the types and surface areas of inorganic seed aerosol that are used to promote the condensation of SOA-forming vapors. The oxidation state of α-pinene SOA is found to increase with inorganic seed surface area, likely a result of enhanced condensation of low-volatility organic compounds on particles versus deposition on the chamber wall. α-Pinene SOA is more highly oxygenated in the presence of sodium nitrate (SN) seed than ammonium sulfate seed. The relative abundance of semivolatile monomers and low-volatility dimer components that account for more than half of α-pinene SOA mass is not significantly affected by the composition of seed aerosol. Enhanced uptake of highly oxidized small carboxylic acids onto SN seed particles is observed, which could potentially explain the observed higher SOA oxidation state in the presence of SN seed aerosol. Overall, our results demonstrate that a combined effect of seed aerosol composition and surface area leads to an increase in the O:C atomic ratio of α-pinene SOA by as much as a factor of 2.

Additional Information

© 2016 American Geophysical Union. Received 25 SEP 2016; Accepted 10 OCT 2016; Accepted article online 12 OCT 2016; Published online 31 OCT 2016. This work was funded by the HKUST Sponsorship scheme for Targeted Strategic Partnerships and U.S. National Science Foundation grant AGS-1523500. Data used to generate the figures are available upon request.

Attached Files

Published - Huang_et_al-2016-Journal_of_Geophysical_Research__Atmospheres.pdf

Supplemental Material - jgrd53391-sup-0001-Supplementary.pdf


Files (7.1 MB)

Additional details

August 22, 2023
October 24, 2023