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| Titel |
Determination of gaseous and particulate carbonyls (glycolaldehyde, hydroxyacetone, glyoxal, methylglyoxal, nonanal and decanal) in the atmosphere at Mt. Tai |
| VerfasserIn |
K. Kawamura, K. Okuzawa, S. G. Aggarwal, H. Irie, Y. Kanaya, Z. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 10 ; Nr. 13, no. 10 (2013-05-28), S.5369-5380 |
| Datensatznummer |
250018677
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| Publikation (Nr.) |
 copernicus.org/acp-13-5369-2013.pdf |
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| Zusammenfassung |
| Gaseous and particulate semi-volatile carbonyl compounds were determined
every three hours in the atmosphere of Mount Tai (elevation, 1534 m) in the
North China Plain during 2–5, 23–24 and 25 June 2006 under clear sky
conditions. Using a two-step filter cartridge in a series, particulate
carbonyls were first collected on a quartz filter and then gaseous carbonyls
were collected on a quartz filter impregnated with O-benzylhydroxylamine
(BHA). After the two-step derivatization with BHA and
N,O-Bis(trimethylsilyl)trifluoroacetamide (BSTFA), carbonyl derivatives were
measured using a gas chromatography. The gaseous concentrations were
obtained as follow: glycolaldehyde (range 0–826 ng m−3, average 303 ng m−3), hydroxyacetone (0–579 ng m−3, 126 ng m−3), glyoxal
(46–1200 ng m−3, 487 ng m−3), methylglyoxal (88–2690 ng m−3,
967 ng m−3), n-nonanal (0–500 ng m−3, 89 ng m−3), and
n-decanal (0–230 ng m−3, 39 ng m−3). These concentrations are
among the highest ever reported in the urban and forest atmosphere. We found
that gaseous α-dicarbonyls (glyoxal and methylglyoxal) are more than
20 times more abundant than particulate carbonyls and that glycolaldehyde is
one order of magnitude more abundant than in aerosol phase. In contrast,
hydroxyacetone and normal aldehydes (nonanal and decanal) are equally
present in both phases. Time-resolved variations of carbonyls did not show
any a clear diurnal pattern, except for hydroxyacetone. We found that
glyoxal, methylglyoxal and glycolaldehyde positively correlated with
levoglucosan (a tracer of biomass burning), suggesting that a contribution
from field burning of agricultural wastes (wheat crops) is significant for
the bifunctional carbonyls in the atmosphere of Mt. Tai. Upward transport of
the pollutants to the mountaintop from the low lands in the North China
Plain is a major process to control the distributions of carbonyls in the
upper atmosphere over Mt. Tai. |
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