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Title: Effect of relative humidity on the composition of secondary organic aerosol from the oxidation of toluene

Abstract

The effect of relative humidity (RH) on the chemical composition of secondary organic aerosol (SOA) formed from low-NO x toluene oxidation in the absence of seed particles was investigated. SOA samples were prepared in an aerosol smog chamber at < 2 % RH and 75 % RH, collected on Teflon filters, and analyzed with nanospray desorption electrospray ionization high-resolution mass spectrometry (nano-DESI–HRMS). Measurements revealed a significant reduction in the fraction of oligomers present in the SOA generated at 75 % RH compared to SOA generated under dry conditions. In a separate set of experiments, the particle mass concentrations were measured with a scanning mobility particle sizer (SMPS) at RHs ranging from < 2 to 90 %. It was found that the particle mass loading decreased by nearly an order of magnitude when RH increased from < 2 to 75–90 % for low-NO x toluene SOA. The volatility distributions of the SOA compounds, estimated from the distribution of molecular formulas using the “molecular corridor” approach, confirmed that low-NO x toluene SOA became more volatile on average under high-RH conditions. In contrast, the effect of RH on SOA mass loading was found to be much smaller for high-NO x toluene SOA. Themore » observed increase in the oligomer fraction and particle mass loading under dry conditions were attributed to the enhancement of condensation reactions, which produce water and oligomers from smaller compounds in low-NO x toluene SOA. The reduction in the fraction of oligomeric compounds under humid conditions is predicted to partly counteract the previously observed enhancement in the toluene SOA yield driven by the aerosol liquid water chemistry in deliquesced inorganic seed particles.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [1]; ORCiD logo [3]; ORCiD logo [1]
  1. Univ. of California, Irvine, CA (United States). Dept. of Chemistry
  2. Purdue Univ., West Lafayette, IN (United States). Dept. of Chemistry
  3. Univ. of California, Irvine, CA (United States). Dept. of Mechanical and Aerospace Engineering
Publication Date:
Research Org.:
Univ. of California, Irvine, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USEPA; National Science Foundation (NSF)
OSTI Identifier:
1501910
Alternate Identifier(s):
OSTI ID: 1542076
Report Number(s):
PNNL-SA-124399
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
SC0018349; AC06-76RL01830; 83588101; 1500284; AGS-1654104; MRI-0923323; AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 18; Journal Issue: 3; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Hinks, Mallory L., Montoya-Aguilera, Julia, Ellison, Lucas, Lin, Peng, Laskin, Alexander, Laskin, Julia, Shiraiwa, Manabu, Dabdub, Donald, and Nizkorodov, Sergey A. Effect of relative humidity on the composition of secondary organic aerosol from the oxidation of toluene. United States: N. p., 2018. Web. doi:10.5194/acp-18-1643-2018.
Hinks, Mallory L., Montoya-Aguilera, Julia, Ellison, Lucas, Lin, Peng, Laskin, Alexander, Laskin, Julia, Shiraiwa, Manabu, Dabdub, Donald, & Nizkorodov, Sergey A. Effect of relative humidity on the composition of secondary organic aerosol from the oxidation of toluene. United States. doi:10.5194/acp-18-1643-2018.
Hinks, Mallory L., Montoya-Aguilera, Julia, Ellison, Lucas, Lin, Peng, Laskin, Alexander, Laskin, Julia, Shiraiwa, Manabu, Dabdub, Donald, and Nizkorodov, Sergey A. Tue . "Effect of relative humidity on the composition of secondary organic aerosol from the oxidation of toluene". United States. doi:10.5194/acp-18-1643-2018. https://www.osti.gov/servlets/purl/1501910.
@article{osti_1501910,
title = {Effect of relative humidity on the composition of secondary organic aerosol from the oxidation of toluene},
author = {Hinks, Mallory L. and Montoya-Aguilera, Julia and Ellison, Lucas and Lin, Peng and Laskin, Alexander and Laskin, Julia and Shiraiwa, Manabu and Dabdub, Donald and Nizkorodov, Sergey A.},
abstractNote = {The effect of relative humidity (RH) on the chemical composition of secondary organic aerosol (SOA) formed from low-NOx toluene oxidation in the absence of seed particles was investigated. SOA samples were prepared in an aerosol smog chamber at < 2 % RH and 75 % RH, collected on Teflon filters, and analyzed with nanospray desorption electrospray ionization high-resolution mass spectrometry (nano-DESI–HRMS). Measurements revealed a significant reduction in the fraction of oligomers present in the SOA generated at 75 % RH compared to SOA generated under dry conditions. In a separate set of experiments, the particle mass concentrations were measured with a scanning mobility particle sizer (SMPS) at RHs ranging from < 2 to 90 %. It was found that the particle mass loading decreased by nearly an order of magnitude when RH increased from < 2 to 75–90 % for low-NOx toluene SOA. The volatility distributions of the SOA compounds, estimated from the distribution of molecular formulas using the “molecular corridor” approach, confirmed that low-NOx toluene SOA became more volatile on average under high-RH conditions. In contrast, the effect of RH on SOA mass loading was found to be much smaller for high-NOx toluene SOA. The observed increase in the oligomer fraction and particle mass loading under dry conditions were attributed to the enhancement of condensation reactions, which produce water and oligomers from smaller compounds in low-NOx toluene SOA. The reduction in the fraction of oligomeric compounds under humid conditions is predicted to partly counteract the previously observed enhancement in the toluene SOA yield driven by the aerosol liquid water chemistry in deliquesced inorganic seed particles.},
doi = {10.5194/acp-18-1643-2018},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 3,
volume = 18,
place = {United States},
year = {2018},
month = {2}
}

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