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Effect of Ammonia on the Volatility of Organic Diacids
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
2014 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 48, no 23, 13769-13775 p.Article in journal (Refereed) Published
Abstract [en]

The effect of ammonia on the partitioning of two dicarboxylic acids, oxalic (C2) and adipic (C6) is determined. Measurements by a tandem differential mobility analysis system and a thermodenuder (TD-TDMA) system are used to estimate the saturation vapor pressure and enthalpy of vaporization of ammonium oxalate and adipate. Ammonia dramatically lowered the vapor pressure of oxalic acid, by several orders of magnitude, with an estimated vapor pressure of 1.7 +/- 0.8 x 10(-6) Pa at 298 K. The vapor pressure of ammonium adipate was 2.5 +/- 0.8 x 10(-5) Pa at 298 K, similar to that of adipic acid. These results suggest that the dominance of oxalate in diacid concentrations measured in ambient aerosol could be attributed to the salt formation with ammonia.

Place, publisher, year, edition, pages
2014. Vol. 48, no 23, 13769-13775 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-111400DOI: 10.1021/es5037805ISI: 000345803800026OAI: oai:DiVA.org:su-111400DiVA: diva2:775796
Note

AuthorCount:3;

Available from: 2015-01-05 Created: 2015-01-02 Last updated: 2017-12-05Bibliographically approved

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