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| Titel |
Online measurements of water-soluble organic acids in the gas and aerosol phase from the photooxidation of 1,3,5-trimethylbenzene |
| VerfasserIn |
A. P. Praplan, K. Hegyi-Gaeggeler, P. Barmet, L. Pfaffenberger, J. Dommen, U. Baltensperger |
| 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 ; 14, no. 16 ; Nr. 14, no. 16 (2014-08-26), S.8665-8677 |
| Datensatznummer |
250118977
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| Publikation (Nr.) |
 copernicus.org/acp-14-8665-2014.pdf |
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| Zusammenfassung |
| The formation of organic acids during photooxidation of
1,3,5-trimethylbenzene (TMB) in the presence of NOx was
investigated with an online ion chromatography (IC) instrument coupled to a
mass spectrometer (MS) at the Paul Scherrer Institute's smog chamber. Gas and
aerosol phase were both sampled. Molecular formulas were attributed to 12
compounds with the help of high-resolution MS data from filter extracts (two
compounds in the gas phase only, two in the aerosol phase only and eight in
both). Seven of those species could be identified: formic acid, acetic acid,
glycolic acid, butanoic acid, pyruvic acid, lactic acid and methylmaleic
acid. While the organic acid fraction present in the aerosol phase does not
strongly depend on the precursor concentration (6 to 20%), the presence of
SO2 reduces this amount to less than 3% for both high and low
precursor concentration scenarios. A large amount of acetic acid was injected
during one experiment after aerosol formation, but no increase of acetic acid
particle concentration could be observed. This indicates that the unexpected
presence of volatile organic acids in the particle phase might not be due to
partitioning effects, but to reactive uptake or to sampling artefact. |
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