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| Titel |
Evaporation of mixed inorganic/organic aerosol particles |
| VerfasserIn |
A. Zardini, I. Riipinen, M. Kulmala  , M. Bilde |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027706
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| Zusammenfassung |
| Biogenic sources as well as human activities contribute large amounts of volatile organic compounds to the atmosphere. Upon oxidation, polyfunctional molecules such as dicarboxylic acids are formed. These molecules generally have lower vapor pressures than the parent molecules and are able to condense on existing particles or maybe even participate in formation of new particles in the atmosphere. Current knowledge about the thermodynamic properties governing this partitioning as well as the influence of the organic molecules on properties of aqueous solution droplets is poor. We have therefore developed a new method based on the HTDMA technique (Hygroscopicity Tandem Differential Mobility Analyzer) for determining the subcooled liquid state vapor pressure as well as other thermodynamic properties of secondary organic aerosol components. We have recently measured evaporation rates of aqueous solution droplets containing one dicarboxylic acid (C3 to C5) and water [1-2-3]. In this work we expand the list of organics and investigate more complicated systems such as
dicarboxylic acid together with inorganic salts. In addition, we show the first results of evaporation of freshly produced organic particles in an environmental chamber.
References:
1. Koponen IK, Thermodynamic properties of malonic, succinic, and glutaric acids: Evaporation rates and saturation vapor pressures. Environmental Science & Technology, 41(11), 3926-3933, 2007.
2. Riipinen I, A method for determining thermophysical properties of organic material in aqueous solutions: Succinic acid. Atmospheric Research, 82(3-4), 579-590, 2006.
3. Zardini AA et al., White light Mie resonance spectroscopy used to measure very low
vapor pressures of substances in aqueous solution aerosol particles. Optics Express 14,6951-6962, 2006. |
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