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Volatility of Organic Aerosol: Evaporation of Ammonium Sulfate/Succinic Acid Aqueous Solution Droplets
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2013 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 47, no 21, 12123-12130 p.Article in journal (Refereed) Published
Abstract [en]

Condensation and evaporation modify the properties and effects of atmospheric aerosol particles. We studied the evaporation of aqueous succinic acid and succinic acid/ammonium sulfate droplets to obtain insights on the effect of ammonium sulfate on the gas/particle partitioning of atmospheric organic acids. Droplet evaporation in a laminar flow tube was measured in a Tandem Differential Mobility Analyzer setup. A wide range of droplet compositions was investigated, and for some of the experiments the composition was tracked using an Aerosol Mass Spectrometer. The measured evaporation was compared to model predictions where the ammonium sulfate was assumed not to directly affect succinic acid evaporation. The model captured the evaporation rates for droplets with large organic content but overestimated the droplet size change when the molar concentration of succinic acid was similar to or lower than that of ammonium sulfate, suggesting that ammonium sulfate enhances the partitioning of dicarboxylic acids to aqueous particles more than currently expected from simple mixture thermodynamics. If extrapolated to the real atmosphere, these results imply enhanced partitioning of secondary organic compounds to particulate phase in environments dominated by inorganic aerosol.

Place, publisher, year, edition, pages
2013. Vol. 47, no 21, 12123-12130 p.
National Category
Environmental Sciences Ecology
Identifiers
URN: urn:nbn:se:su:diva-97385DOI: 10.1021/es401233cISI: 000326711300033OAI: oai:DiVA.org:su-97385DiVA: diva2:678180
Funder
Swedish Research Council, 2011-5120Formas, 2009-615
Note

AuthorCount:11;

Funding agencies:

Academy of Finland Centre of Excellence program, 1118615; Doctoral Programme in Atmospheric Composition and Climate Change,129663; Danish Agency for Science Technology and Innovation,09-052140; Vetenskapsradet, 2011-5120; European Research Council Grant ATMOGAIN, 278277; Swedish Research Council FORMAS, 2009-615 

Available from: 2013-12-11 Created: 2013-12-09 Last updated: 2017-12-06Bibliographically approved

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