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Diurnal changes in the distribution of dicarboxylic acids, ketocarboxylic acids and dicarbonyls in the urban Tokyo atmosphere
| Title: | Diurnal changes in the distribution of dicarboxylic acids, ketocarboxylic acids and dicarbonyls in the urban Tokyo atmosphere |
| Authors: | Kawamura, Kimitaka Browse this author →KAKEN DB | | Yasui, Osamu Browse this author |
| Keywords: | Dicarboxylic acid | | Ketocarboxylic acids | | Dicarbonyls | | Urban aerosols | | Photochemical production of organic aerosols |
| Issue Date: | Mar-2005 |
| Publisher: | Elsevier |
| Journal Title: | Atmospheric Environment |
| Volume: | 39 |
| Issue: | 10 |
| Start Page: | 1945 |
| End Page: | 1960 |
| Publisher DOI: | 10.1016/j.atmosenv.2004.12.014 |
| Abstract: | Secondary organic aerosol in the urban atmosphere is an important issue from a viewpoint of not only air pollution but also regional and global atmospheric environment. To better understand the production of water-soluble organic aerosols, we analyzed atmospheric particles collected in time-series in Tokyo for dicarboxylic acids (C2-C10), ketocarboxylic acids (C2-C4) and a-dicarbonyls (C2-C3) using a GC and GC/MS. Here, we report, for the first time, diurnal distributions of dicarboxylic acids, ketoacids and dicarbonys in the urban atmosphere. Oxalic acid was found as the most abundant species, followed by malonic, succinic, pyruvic and glyoxylic acids. Total diacids showed a concentration maximum in daytime (11-14 h) with a dynamic change in their molecular composition especially in summer samples. Relative abundances of unsaturated (maleic, methylmaleic and phthalic) and some saturated (methylsuccinic and adipic) species increased in the morning (8-11 h) whereas those of oxalic acid decreased down to 35 % in 8-11 h but increased up to 58 % toward 17-20 h. The diurnal variations are interpreted by photochemical production of diacids, where unsaturated and some saturated species are preferentially generated early in the morning via photo-oxidation of aromatic hydrocarbons and cyclic olefins and further oxidized to oxalic acid in the afternoon. |
| Relation: | http://www.sciencedirect.com/science/journal/13522310 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/10507 |
| Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 河村 公隆
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