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| Titel |
Vapor pressures of a homologous series of polyethylene glycols as a reference data set for validating vapor pressure measurement techniques. |
| VerfasserIn |
Ulrich Krieger, Claudia Marcolli, Franziska Siegrist |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109023
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| Publikation (Nr.) |
 EGU/EGU2015-8885.pdf |
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| Zusammenfassung |
| The production of secondary organic aerosol (SOA) by gas-to-particle partitioning is
generally represented by an equilibrium partitioning model. A key physical parameter which
governs gas-particle partitioning is the pure component vapor pressure, which is difficult to
measure for low- and semivolatile compounds. For typical atmospheric compounds like e.g.
citric acid or tartaric acid, vapor pressures have been reported in the literature which differ by
up to six orders of magnitude [Huisman et al., 2013].
Here, we report vapor pressures of a homologous series of polyethylene glycols
(triethylene glycol to octaethylene glycol) determined by measuring the evaporation rate of
single, levitated aerosol particles in an electrodynamic balance. We propose to use
those as a reference data set for validating different vapor pressure measurement
techniques. With each addition of a (O-CH2-CH2)-group the vapor pressure is lowered by
about one order of magnitude which makes it easy to detect the lower limit of vapor
pressures accessible with a particular technique down to a pressure of 10-8 Pa at room
temperature.
Reference: Huisman, A. J., Krieger, U. K., Zuend, A., Marcolli, C., and Peter, T., Atmos.
Chem. Phys., 13, 6647–6662, 2013. |
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