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| Titel |
Analysis of Glyoxal and Methylglyoxal in atmospheric particulate matter - Qualification and Quantification using a derivatisation method for HPLC-ESI-MS |
| VerfasserIn |
Christopher Kampf, Thorsten Hoffmann |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250039551
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| Zusammenfassung |
| In recent years much effort has been put into the analysis of so called secondary organic
aerosols (SOA). SOA is produced through gas phase oxidation of volatile organic compounds
(VOC’s) by atmospheric oxidants like OH- or NO3-radicals or ozone with subsequent
gas-particle partitioning of the low volatility products. VOC’s are emitted by both biogenic
and anthropogenic sources in large amounts into the atmosphere. However, it is found that
gas to particle partitioning alone cannot explain the complete amount of SOA produced in the
atmosphere. It is therefore proposed that heterogeneous reactions on the particle
surface or in the particles themselves could lead to the formation of additional SOA
mass from semi-volatile compounds such as the reactive dialdehydes glyoxal and
methylglyoxal[1].
Global glyoxal and methylglyoxal emissions are estimated to be 45 Tg a-1 and 140 Tg a-1,
respectively. The oxidation of biogenic isoprene contributes to about 47% of the total
glyoxal mass formed and even to about 79% for methylglyoxal[2]. Due to their high
solubility in water (hydration of aldehyde functions), glyoxal and methylglyoxal have
a high potential to form SOA via heterogeneous reactions in the particle phase
although their volatility is relatively high. Several studies propose oligomerisation or
formation of imidazole derivatives as potential reaction pathways to reduce their
volatility[1,3,4,5].
Here we present a method for the qualification and quantification of both glyoxal and
methylglyoxal in atmospheric PM2.5 filter samples via derivatisation with phenylhydrazine.
Reproducibility, recovery and limits of detection and quantification are given. The method is
found to be easily suitable for measurements at atmospheric concentration levels for both
substances. First results of a measurement campaign in Mainz, Germany in August 2009 are
shown for a proof of principle. Initial problems of the method development due to the
chemical nature of the analytes und future enhancements of the sampling procedure are
discussed.
References
1. Kalberer, M., et al. (2004). Science, 303(5664), 1659–1662
2. Fu, T.-M., et al. (2008). Journal of Geophysical Research, 113, D15303
3. Iinuma, Y., et al. (2004). Atmospheric Environment, 38(5), 761–773
4. Galloway, M. M., et al. (2009), Atmos. Chem. Phys., 9, 3331–3345
5. Nozière, B., et al. (2009), J. Phys. Chem. A, 113, 231-237 |
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