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| Titel |
A model of aerosol evaporation kinetics in a thermodenuder |
| VerfasserIn |
C. D. Cappa |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 3 ; Nr. 3, no. 3 (2010-05-11), S.579-592 |
| Datensatznummer |
250001107
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| Publikation (Nr.) |
 copernicus.org/amt-3-579-2010.pdf |
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| Zusammenfassung |
| Aerosol thermodenuders provide a measure of particle volatility. The
information provided by a thermodenuder is fundamentally related to the
kinetics of evaporation and condensation within the device. Here, a
time-dependent, multi-component model of particle and gas-phase mass
transfer in a thermodenuder is described. This model empirically accounts
for the temperature profile along the length of a typical thermodenuder and
distinguishes between the influence of the heating section and of the
adsorbent denuder section. It is shown that "semi-volatile" aerosol is
particularly sensitive to the inclusion of an adsorbent denuder in the
model. As expected, the mass loss from evaporation of particles as they pass
through the thermodenuder is directly related to the compound vapor
pressure, although the assumptions regarding the enthalpy of vaporization
are shown to also have a large influence on the overall calculated mass
thermograms. The model has been validated by comparison with previously
measured mass thermograms for single-component aerosols and is shown to
provide reasonable semi-quantitative agreement. The model that has been
developed here can be used to provide quantitative understanding of aerosol
volatility measurements of single and multi-component aerosol made using
thermodenuders that include adsorbent denuder sections. |
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