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| Titel |
An enhanced procedure for measuring organic acids and methyl esters in PM2.5 |
| VerfasserIn |
F. Liu, F. K. Duan, K. B. He, Y. L. Ma, K. A. Rahn, Q. Zhang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 11 ; Nr. 8, no. 11 (2015-11-19), S.4851-4862 |
| Datensatznummer |
250116689
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| Publikation (Nr.) |
 copernicus.org/amt-8-4851-2015.pdf |
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| Zusammenfassung |
| A solid-phase extraction (SPE) pretreatment procedure allowing organic acids
to be
separated from methyl esters in fine aerosol has been developed. The
procedure first separates the organic acids from fatty acid methyl esters (FAMEs) and other nonacid organic compounds by aminopropyl-based SPE
cartridge and then quantifies them by gas chromatography/mass spectrometry. The
procedure prevents the fatty acids and dimethyl phthalate from being
overestimated, and so allows us to accurately quantify the
C4–C11
dicarboxylic acids (DCAs) and the C8–C30 monocarboxylic acids (MCAs). Results for the extraction of DCAs, MCAs, and AMAs in eluate and
FAMEs in effluate by SAX and NH2 SPE cartridges exhibited that the
NH2 SPE cartridge gave higher extraction efficiency than the SAX
cartridge. The recoveries of analytes ranged from 67.5 to 111.3 %, and the
RSD ranged from 0.7 to 10.9 %. The resulting correlations between the
aliphatic acids and FAMEs suggest that the FAMEs had sources similar to
those of the carboxylic acids, or were formed by esterifying carboxylic
acids, or that aliphatic acids were formed by hydrolyzing FAMEs. Through
extraction and cleanup using this procedure, 17 aromatic acids in eluate
were identified and quantified by gas chromatography/tandem mass
spectrometry, including five polycyclic aromatic hydrocarbon (PAH): acids
2-naphthoic, biphenyl-4-carboxylic, 9-oxo-9H-fluorene-1-carboxylic,
biphenyl-4,4´-dicarboxylic, and phenanthrene-1-carboxylic acid, plus
1,8-naphthalic anhydride. Correlations between the PAH acids and the
dicarboxylic and aromatic acids suggested that the first three acids and
1,8-naphthalic anhydride were secondary atmospheric photochemistry products
and
the last two mainly primary. |
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