Document Detail


Spatial and seasonal trends in biogenic secondary organic aerosol tracers and water-soluble organic carbon in the southeastern United States.
MedLine Citation:
PMID:  18754365     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Twenty-four hour integrated filter samples of fine particulate matter (PM2.5) were collected from May 2004 to April 2005 at one rural site and three urban sites located in the southeastern United States. Filters were extracted and analyzed for both biogenic secondary organic aerosol (SOA) tracers via gas chromatography-mass spectrometry (GC-MS), and water-soluble organic carbon (WSOC) concentrations. The tracers reported in this study include isoprene-derived 2-methylthreitol and 2-methylerythritol, as well as pinene-derived cis-pinonic acid. The mean ambient concentrations ranged from 21.7 to 94.3 ng/m3, 5.31 to 17.9 ng/m3, and 1.87 to 3.18 microgC/m3 for 2-methyltetrols (sum of 2-methylerythritol and 2-methylthreitol), cispinonic acid and WSOC, respectively. Distinct spatial distributions were observed for all tracers with the highest concentration at the rural site and the lowest level at a coastal site. Although 2-methyltetrols were small fractions of WSOC, varying from 0.35% at an urban site to highest fractions of 1.09% at the rural site, WSOC exhibited significant correlation with 2-methyltetrols during summer, suggesting isoprene SOA makes an important contribution to WSOC. 2-Methyltetrols had the highest concentrations during the summer,when high temperature, intense solar radiation, and high ozone level occurred. However, no obvious seasonal variation was found for cispinonic acid. Between inland sites WSOC was more spatially homogeneous than the 2-methyltetrols, suggesting that WSOC was produced from a variety of mechanisms.
Authors:
Xiang Ding; Mei Zheng; Liping Yu; Xiaolu Zhang; Rodney J Weber; Bo Yan; Armistead G Russell; Eric S Edgerton; Xinming Wang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-08-29     Completed Date:  2008-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5171-6     Citation Subset:  IM    
Affiliation:
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
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MeSH Terms
Descriptor/Qualifier:
Aerosols / chemistry*
Air Pollutants / analysis*
Carbon / analysis*
Environmental Monitoring
Fatty Acids, Unsaturated / chemistry
Gas Chromatography-Mass Spectrometry
Humans
Particle Size
Particulate Matter / analysis*
Seasons*
Southeastern United States
Sugar Alcohols / chemistry
Water / chemistry*
Chemical
Reg. No./Substance:
0/Aerosols; 0/Air Pollutants; 0/Fatty Acids, Unsaturated; 0/Particulate Matter; 0/Sugar Alcohols; 590-93-2/2-butynoic acid; 7440-44-0/Carbon; 7493-90-5/threitol; 7732-18-5/Water

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


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