Document Detail

Secondary organic carbon and aerosol yields from the irradiations of isoprene and alpha-pinene in the presence of NOx and SO2.
MedLine Citation:
PMID:  16830546     Owner:  NLM     Status:  MEDLINE    
A laboratory study was carried out to investigate the secondary organic carbon (SOC) yields of alpha-pinene and isoprene in the presence of SO2, which produces acidic aerosol in the system. Experiments were based on irradiating each hydrocarbon (HC) with NOx in a 14.5 m3 smog chamber operated in the dynamic mode. The experimental design consisted of several multi-part experiments for each HC. In the first part of each experiment, an HC/NOx irradiation was conducted in the absence of SO2 and was followed by irradiations with the addition of SO2 in subsequent parts. Filter-based analyses for organic carbon were made using a thermal-optical approach either with an off-line instrument or in situ with an automated instrument. For isoprene in the absence of SO2, the SOC yield was approximately 0.001, a value consistent with earlier work from this laboratory. With the addition of up to 200 ppb SO2, the yield increased by a factor of 7. For alpha-pinene in the absence of SO2, the SOC yield of the irradiated mixture was found to average 0.096 from two experiments. With SO2 in the system, the SOC yield increased on average to 0.132. These results suggest that SO2, and by inference acidic aerosol, may play a role in increasing the yield of SOC from the photooxidation products of biogenic hydrocarbons or by the direct uptake of biogenic hydrocarbons onto acidic aerosol.
Tadeusz E Kleindienst; Edward O Edney; Michael Lewandowski; John H Offenberg; Mohammed Jaoui
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  40     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-07-11     Completed Date:  2006-11-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3807-12     Citation Subset:  IM    
National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA.
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MeSH Terms
Air Pollutants / analysis*
Butadienes / radiation effects*
Carbon / analysis*
Hemiterpenes / radiation effects*
Models, Theoretical
Monoterpenes / radiation effects*
Nitric Oxide
Organic Chemicals / analysis*
Pentanes / radiation effects*
Sulfur Dioxide*
Ultraviolet Rays
Reg. No./Substance:
0/Aerosols; 0/Air Pollutants; 0/Butadienes; 0/Hemiterpenes; 0/Monoterpenes; 0/Organic Chemicals; 0/Pentanes; 10102-43-9/Nitric Oxide; 7440-44-0/Carbon; 7446-09-5/Sulfur Dioxide; 78-79-5/isoprene; 80-56-8/alpha-pinene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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