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- Title
Determination of gaseous and particulate carbonyls (glycolaldehyde, hydroxyacetone, glyoxal, methylglyoxal, nonanal and decanal) in the atmosphere at Mt. Tai.
- Authors
Kawamura, K.; Okuzawa, K.; Aggarwal, S. G.; Irie, H.; Kanaya, Y.; Wang, Z.
- Abstract
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 a clear sky condition. Using 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 0-1271 ngm-3, average 555ngm-3), hydroxyacetone (0-707 ngm-3, 163 ngm-3), glyoxal (198-1396 ngm-3, 720 ngm-3), methylglyoxal (410-3170 ngm-3, 1376ng-3), n-nonanal (0-236ng-3, 71 ngm-3), and n-decanal (0-159ng-3, 31 ngm-3). These concentrations are among the highest ever reported in the urban and forest atmosphere. We found that gaseous carbonyls are more than 10 times more abundant than particulate carbonyls. 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.
- Subjects
CARBONYL group; GLYCOLALDEHYDE; ACETONE; GLYOXAL; NONANAL; BIOMASS
- Publication
Atmospheric Chemistry & Physics Discussions, 2013, Vol 13, Issue 1, p2725
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-13-2725-2013