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Effect of Hydrophilic Organic Seed Aerosols on Secondary Organic Aerosol Formation from Ozonolysis of α-Pinene.
MedLine Citation:
PMID:  21790137     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Gas-particle partitioning theory is widely used in atmospheric models to predict organic aerosol loadings. This theory predicts that secondary organic aerosol (SOA) yield of an oxidized volatile organic compound (VOC) product will increase as the mass loading of preexisting organic aerosol increases. In a previous study, we showed that the presence of model hydrophobic primary organic aerosol (POA) had no detectable effect on the SOA yields from ozonolysis of a-pinene, suggesting that the condensing SOA compounds form a separate phase from the preexisting POA. However, a substantial faction of atmospheric aerosol is comprised of polar, hydrophilic organic compounds. In this study, we investigate the effects of model hydrophilic organic aerosol (OA) species such as fulvic acid, adipic acid and citric acid on the gas-particle partitioning of SOA from a-pinene ozonolysis. The results show that only citric acid seed significantly enhances the absorption of a-pinene SOA into the particle-phase. The other two seed particles have negligible effect on the a-pinene SOA yields, suggesting that a-pinene SOA forms a well-mixed organic aerosol phase with citric acid and a separate phase with adipic acid and fulvic acid. This finding highlights the need to improve the thermodynamics treatment of organics in current aerosol models that simply lump all hydrophilic organic species into a single phase, thereby potentially introducing an erroneous sensitivity of SOA mass to emitted OA species.
Authors:
Chen Song; Rahul Zaveri; John Shilling; Lizabeth M Alexander; Matt K Newburn
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-26
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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