Organosulfates – A New Component of Humic-Like Substances in Atmospheric Aerosols?
- 1.3k Downloads
Ion trap mass spectrometry (ITMS) was used to obtain further qualitative information about the chemical composition of humic-like substances (HULIS) in atmospheric particulate matter. Particles ≤10 μm (PM10) were collected on quartz fiber filters for 24 h in the region of Basel (Switzerland) and extracted with water. HULIS were separated from inorganic salts by size exclusion chromatography (SEC) and detected by electrospray ionization in the negative ion mode (ESI(−)). Series of consecutive fragment ion spectra (MSn) were recorded by ITMS. Full scan mass spectra of the extracts showed a mass distribution pattern characteristic for HULIS. Different molecular ions were selected from this pattern for further fragmentations. Among them the molecular ion m/z 299 was considered as representative and intensively studied. Many MS2 and MS3 fragment spectra contained a fragment m/z 97 and a neutral loss of 80 u. Time-of-flight (TOF) MS and deuterium exchange experiments identified m/z 97 as hydrogen sulfate. MS2 and MS3 fragment spectra supported the existence of sulfate covalently bound to HULIS. The fragmentation behavior of sulfated HULIS could be confirmed by model compounds.
Key wordsatmospheric aerosols CCN electrospray HULIS ion trap mass spectrometry
Unable to display preview. Download preview PDF.
- Brimblecombe, P., 1996: Air Composition & Chemistry, Cambridge University Press, Cambridge.Google Scholar
- Facchini, M. C., Fuzzi, S., Zappoli, S., Andracchio, A., Gelencser, A., Kiss, G., Krivacsy, Z., Meszaros, E., Hansson, H.-C., Alsberg, T., and Zebühr, Y., 1999: Partitioning of the organic aerosol component between fog droplets and interstitial air, J. Geophys. Res. 104, 26821–26832.CrossRefGoogle Scholar
- Fuzzi, S., Facchini, M. C., Decesari, S., Matta, E., and Mircea, M., 2002: Soluble organic compounds in fog and cloud droplets: What have we learned over the past few years? Atmos. Environ. 64, 89–98.Google Scholar
- Jacobson, M. C., Hansson, H.-C., Noone, K. J., and Charlson, R. J., 2000: Organic Atmospheric Aerosols: Review and State of the Science, Review of Geophysics 38, 267–294.Google Scholar
- Kiss, G., Gelencser, A., Hoffer, A., Krivacsy, Z., Meszaros, E., Molnar, A., and Varga, B., 2000: Chemical characterisation of water soluble organic compounds in tropospheric fine aerosol, Proc. Conf. on Nucleation and Atmospheric Aerosols, 761–764.Google Scholar
- Krivacsy, Z., Hoffer, A., Sarvari, Z., Temesi, D., Baltensperger, U., Nyeki, S., Weingartner, E., Kleefeld, S., and Jennings, S. G., 2001: Role of organic and black carbon in the chemical composition of atmospheric aerosol at European background sites, Atmos. Environ. 35, 6231–6244.CrossRefGoogle Scholar
- Seinfeld, J. H. and Pandis, S. N., 1998: Atmospheric Chemistry and Physics, Wiley-Interscience, New York.Google Scholar
- Suzuki, Y., Kawakami, M., and Akasaka, K., 2001: 1H NMR application for characterizing water-soluble organic compounds in urban atmospheric particles, Environ. Sci. Technol. 35, 2656–2664.Google Scholar
- UNEP, 2003: Global Environment Outlook 3 – GEO 2003, Earthscan Publication Ltd, London.Google Scholar
- Zappoli, S., Andracchio, A., Fuzzi, S., Facchini, M. C., Gelencser, A., Kiss, G., Krivacsy, Z., Molnar, A., Meszaros, E., Hansson, H.-C., Rosman, K., and Zebühr, Y., 1999: Inorganic, organic and macromolecular components of fine aerosol in different areas of Europe in relation to their water solubility, Atmos. Environ. 33, 2733–2743.CrossRefGoogle Scholar