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| Titel |
Partially oxidised organic components in urban aerosol using GCXGC-TOF/MS |
| VerfasserIn |
J. F. Hamilton, P. J. Webb, A. C. Lewis, J. R. Hopkins, S. Smith, P. Davy |
| 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 ; 4, no. 5 ; Nr. 4, no. 5 (2004-08-18), S.1279-1290 |
| Datensatznummer |
250001939
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| Publikation (Nr.) |
 copernicus.org/acp-4-1279-2004.pdf |
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| Zusammenfassung |
| Partially oxidised organic compounds associated with PM2.5 aerosol collected
in London, England, have been analysed using direct thermal desorption
coupled to comprehensive gas chromatography-time of flight mass spectrometry
(GCXGC-TOF/MS). Over 10000 individual organic components were isolated from
around 10µg of aerosol material in a single procedure and with no
sample pre-treatment. Chemical functionalities observed using this
analytical technique ranged from alkanes to poly-oxygenated species. The
chemical band structures commonly used in GCXGC for group type
identifications overlap for this sample type, and have required mass
spectrometry as an additional level of instrument dimensionality. An
investigation of oxygenated volatile organic compounds (o-VOC) contained
within urban aerosol has been performed and in a typical sample around 130
o-VOCs were identified based on retention behaviour and spectral match. In
excess of 100 other oxygenated species were also observed but lack of mass
spectral library or pure components prevents positive identification. Many
of the carbonyl species observed could be mechanistically linked to gas
phase aromatic hydrocarbon oxidation and there is good agreement in terms of
speciation between the urban samples analysed here and those degradation
products observed in smog chamber experiments of aromatic oxidation. The
presence of partially oxidised species such as linear chain aldehydes and
ketones and cyclic products such as furanones suggests that species
generated early in the oxidative process may undergo gas to
particle partitioning despite their relatively high volatility. |
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