The vapor pressures and activities of dicarboxylic acids reconsidered: the impact of the physical state of the aerosol
Abstract
We present vapor pressure data of the C_2 to C_5 dicarboxylic acids deduced from measured evaporation rates of single levitated particles as both, aqueous droplets and solid crystals. The data of aqueous solution particles over a wide concentration range allow us to directly calculate activities of the dicarboxylic acids and comparison of these activities with parameterizations reported in the literature. The data of the pure liquid state acids, i.e. the dicarboxylic acids in their supercooled melt state, exhibit no even-odd alternation in vapor pressure, while the acids in the solid form do. This observation is consistent with the known solubilities of the acids and our measured vapor pressures of the supercooled melt. Thus, the gas/particle partitioning of the different dicarboxylic acids in the atmosphere depends strongly on the physical state of the aerosol phase, the difference being largest for the even acids. Our results show also that, in general, measurements of vapor pressures of solid dicarboxylic acids may be compromised by the presence of polymorphic forms, crystalline structures with a high defect number, and/or solvent inclusions in the solid material, yielding a higher vapor pressure than the one of the thermodynamically stable crystalline form at the same temperature.
Additional Information
© Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union. Received: 23 July 2010; Published in Atmos. Chem. Phys. Discuss.: 27 August 2010; Revised: 2 December 2010; Accepted: 3 December 2010; Published: 10 December 2010. This work was supported by ETH Research Grant ETH-2406-3, EUROCHAMP 2, and Swiss National Science Foundation under contract No. PA00P2-126227. We would like to acknowledge fruitful discussion with Th. Peter and M. Bilde. Edited by: M. AmmannAttached Files
Published - Soonsin2010p12436Atmos_Chem_Phys.pdf
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Additional details
- Eprint ID
- 21861
- Resolver ID
- CaltechAUTHORS:20110124-095145995
- ETH-2406-3
- Eldgenössische Technische Honschule (ETH)
- EUROCHAMP 2
- Eldgenössische Technische Honschule (ETH)
- PA00P2-126227
- Swiss National Science Foundation (SNSF)
- Created
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2011-01-24Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field