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| Titel |
A molecular-level approach for characterizing water-insoluble components of ambient organic aerosol particulates using ultrahigh-resolution mass spectrometry |
| VerfasserIn |
A. S. Willoughby, A. S. Wozniak, P. G. Hatcher |
| 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. 18 ; Nr. 14, no. 18 (2014-09-30), S.10299-10314 |
| Datensatznummer |
250119070
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| Publikation (Nr.) |
 copernicus.org/acp-14-10299-2014.pdf |
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| Zusammenfassung |
| The chemical composition of organic aerosols in the atmosphere is strongly
influenced by human emissions. The effect these have on the environment,
human health, and climate change is determined by the molecular nature of
these chemical species. The complexity of organic aerosol samples limits the
ability to study the chemical composition, and therefore the associated
properties and the impacts they have. Many studies have addressed the water-soluble
fraction of organic aerosols and have had much success in identifying
specific molecular formulas for thousands of compounds present. However,
little attention is given to the water-insoluble portion, which can contain
most of the fossil material that is emitted through human activity. Here we
compare the organic aerosols present in water extracts and organic solvent
extracts (pyridine and acetonitrile) of an ambient aerosol sample collected
in a rural location that is impacted by natural and anthropogenic emission
sources. A semiquantitative method was developed using proton nuclear
magnetic resonance spectroscopy to determine that the amount of organic
matter extracted by pyridine is comparable to that of water. Electrospray
ionization Fourier transform ion cyclotron resonance mass spectra show that
pyridine extracts a molecularly unique fraction of organic matter compared
to water or acetonitrile, which extract chemically similar organic matter
components. The molecular formulas unique to pyridine were less polar, more
aliphatic, and reveal formulas containing sulfur to be an important
component of insoluble aerosol organic matter. |
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