Document Detail


Two-dimensional NMR studies of water-soluble organic matter in atmospheric aerosols.
MedLine Citation:
PMID:  19068798     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The potential and the limitations of combining two-dimensional nuclear magnetic resonance (2D NMR) techniques to deliver new qualitative information on the substructures present in water-soluble organic compounds (WSOC) from fine atmospheric aerosols collected during Winter and Spring/Summer seasons are highlighted in this study. The WSOC fractions were extracted from quartz filter samples and further separated into hydrophobic acids and hydrophilic acids fractions by using a XAD-8/XAD-4 isolation procedure. Despite different spectral resolution, it was found that the aliphatic material of both samples includes mostly long-chain (carbons greater than 3 or 4) and branched mono- and dicarboxylic acids, carbonyl, and ester structural types. The presence of such structural fragments could be associated to secondary organic aerosol formation. It has been further demonstrated that spectral signatures typical of anhydrosugars from cellulose and methoxyphenols from lignin can be identified among the carbohydrate and aromatic moieties of the Winter sample. Their presence highlights the major influence of biomass burning on atmospheric particulate matter collected during colder periods. The data reported here demonstrate the success of 2D NMRtechniquesto investigate aerosol WSOC composition, as well as to evaluate aerosol source fingerprints.
Authors:
Regina M B O Duarte; Artur M S Silva; Armando C Duarte
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-12-11     Completed Date:  2009-01-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8224-30     Citation Subset:  IM    
Affiliation:
CESAM & Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal. regina.duarte@ua.pt
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MeSH Terms
Descriptor/Qualifier:
Aerosols / chemistry*
Air Pollutants / analysis*
Atmosphere / chemistry*
Magnetic Resonance Spectroscopy / methods*
Molecular Structure
Organic Chemicals / analysis*
Particulate Matter
Seasons
Water / chemistry*
Chemical
Reg. No./Substance:
0/Aerosols; 0/Air Pollutants; 0/Organic Chemicals; 0/Particulate Matter; 7732-18-5/Water

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


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