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Title: Heating-Induced Evaporation of Nine Different Secondary Organic Aerosol Types

Abstract

The volatility of the compounds comprising organic aerosol (OA) determines their distribution between the gas and particle phases. However, there is a disconnect between volatility distributions as typically derived from secondary OA (SOA) growth experiments and the effective particle volatility as probed in evaporation experiments. Specifically, the evaporation experiments indicate an overall much less volatile SOA. This raises questions regarding the use of traditional volatility distributions in the simulation and prediction of atmospheric SOA concentrations. Here, we present results from measurements of thermally induced evaporation of SOA for nine different SOA types (i.e., distinct volatile organic compound and oxidant pairs) encompassing both anthropogenic and biogenic compounds and O3 and OH to examine the extent to which the low effective volatility of SOA is a general phenomenon or specific to a subset of SOA types. The observed extents of evaporation with temperature were similar for all the SOA types and indicative of a low effective volatility. Furthermore, minimal variations in the composition of all the SOA types upon heating-induced evaporation were observed. These results suggest that oligomer decomposition likely plays a major role in controlling SOA evaporation, and since the SOA formation time scale in these measurements was less than amore » minute, the oligomer-forming reactions must be similarly rapid. Overall, these results emphasize the importance of accounting for the role of condensed phase reactions in altering the composition of SOA when assessing particle volatility.« less

Authors:
; ;  [1];
  1. Chemical Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1222495
Alternate Identifier(s):
OSTI ID: 1392973
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Name: Environmental Science and Technology Journal Volume: 49 Journal Issue: 20; Journal ID: ISSN 0013-936X
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Kolesar, Katheryn R., Li, Ziyue, Wilson, Kevin R., and Cappa, Christopher D. Heating-Induced Evaporation of Nine Different Secondary Organic Aerosol Types. United States: N. p., 2015. Web. doi:10.1021/acs.est.5b03038.
Kolesar, Katheryn R., Li, Ziyue, Wilson, Kevin R., & Cappa, Christopher D. Heating-Induced Evaporation of Nine Different Secondary Organic Aerosol Types. United States. https://doi.org/10.1021/acs.est.5b03038
Kolesar, Katheryn R., Li, Ziyue, Wilson, Kevin R., and Cappa, Christopher D. Thu . "Heating-Induced Evaporation of Nine Different Secondary Organic Aerosol Types". United States. https://doi.org/10.1021/acs.est.5b03038.
@article{osti_1222495,
title = {Heating-Induced Evaporation of Nine Different Secondary Organic Aerosol Types},
author = {Kolesar, Katheryn R. and Li, Ziyue and Wilson, Kevin R. and Cappa, Christopher D.},
abstractNote = {The volatility of the compounds comprising organic aerosol (OA) determines their distribution between the gas and particle phases. However, there is a disconnect between volatility distributions as typically derived from secondary OA (SOA) growth experiments and the effective particle volatility as probed in evaporation experiments. Specifically, the evaporation experiments indicate an overall much less volatile SOA. This raises questions regarding the use of traditional volatility distributions in the simulation and prediction of atmospheric SOA concentrations. Here, we present results from measurements of thermally induced evaporation of SOA for nine different SOA types (i.e., distinct volatile organic compound and oxidant pairs) encompassing both anthropogenic and biogenic compounds and O3 and OH to examine the extent to which the low effective volatility of SOA is a general phenomenon or specific to a subset of SOA types. The observed extents of evaporation with temperature were similar for all the SOA types and indicative of a low effective volatility. Furthermore, minimal variations in the composition of all the SOA types upon heating-induced evaporation were observed. These results suggest that oligomer decomposition likely plays a major role in controlling SOA evaporation, and since the SOA formation time scale in these measurements was less than a minute, the oligomer-forming reactions must be similarly rapid. Overall, these results emphasize the importance of accounting for the role of condensed phase reactions in altering the composition of SOA when assessing particle volatility.},
doi = {10.1021/acs.est.5b03038},
journal = {Environmental Science and Technology},
number = 20,
volume = 49,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 2015},
month = {Thu Oct 01 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1021/acs.est.5b03038

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