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| Identifier |
000374564 |
| Title |
Προσδιορισμός υδατοδιαλυτών οργανικών ενώσεων σε δευτερογενή αερολύματα με τη φασματοσκοπία NMR |
| Alternative Title |
Determination of water-soluble organic compounds in secondary aerosols by NMR spectroscopy |
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Author
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Αμαργιανιτάκη, Μαρία Αντ.
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Thesis advisor
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Σπύρος, Απόστολος
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| Abstract |
Atmospheric aerosols have important implications in climate evolution and
human health. Their sources can be either primary (fossil fuel burning, biomass burning, dust) or secondary due to complicated organic heterogeneous chemistry in
the atmosphere. The organic chemical composition of atmospheric aerosols is still largely unknown.
This study reports the qualitative and quantitative characterization of the
water soluble organic compounds present in aerosols by 1D 1Η NMR spectroscopy and two-dimensional homonuclear (1Η-1Η) gCOSY and heteronuclear (1Η-13C)
gHMQC και gHMBC NMR spectroscopy. Additionally, the Total Solid Particles (TSP) and the Organic (OC), Elemental (EC), Water-soluble (DOC) and Non-water-soluble Carbon (nDOC) contents of the aerosols were determined experimentally. Aerosol
sampling was performed during two different time periods (winter-summer) and at two different locations (urban-semirural). A separate set of samples was obtained by particle fractionation of aerosols according to size in fine (PM2.1), intermediate and coarse particles.
The analysis of the experimental NMR data showed that the total amount
and the chemical composition of the water-soluble organic fraction of the aerosols depend on the sampling period (winter-summer), and that the low MW organic compounds (mainly acids and diacids) identified by NMR spectroscopy are not distributed evenly between the different particle size fractions. Several differences
were noted between the composition of aerosol obtained from urban and semirural sampling sites. The larger organic content of aerosols during the winter season was tentatively attributed to episodic biomass burning in the semirural sampling site.
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| Language |
Greek |
| Subject |
Dissolved organic carbon |
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NMR spectroscopy |
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Organic acids |
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Οργανικά οξέα |
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Υδατοδιαλυτός οργανικός άνθρακας |
| Issue date |
2012-03-16 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
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Type of Work--Post-graduate theses
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| Views |
310 |
Προσδιορισμός υδατοδιαλυτών οργανικών ενώσεων σε δευτερογενή αερολύματα με τη φασματοσκοπία NMR
