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Effect of Inorganic Salts on the Volatility of Organic Acids
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM). University of Helsinki, Finland.
2014 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 48, no 23, 13718-13726 p.Article in journal (Refereed) Published
Abstract [en]

Particulate phase reactions between organic and inorganic compounds may significantly alter aerosol chemical properties, for example, by suppressing particle volatility. Here, chemical processing upon drying of aerosols comprised of organic (acetic, oxalic, succinic, or citric) acid/monovalent inorganic salt mixtures was assessed by measuring the evaporation of the organic acid molecules from the mixture using a novel approach combining a chemical ionization mass spectrometer coupled with a heated flow tube inlet (TPD-CIMS) with kinetic model calculations. For reference, the volatility, i.e. saturation vapor pressure and vaporization enthalpy, of the pure succinic and oxalic acids was also determined and found to be in agreement with previous literature. Comparison between the kinetic model and experimental data suggests significant particle phase processing forming low-volatility material such as organic salts. The results were similar for both ammonium sulfate and sodium chloride mixtures, and relatively more processing was observed with low initial aerosol organic molar fractions. The magnitude of low-volatility organic material formation at an atmospherically relevant pH range indicates that the observed phenomenon is not only significant in laboratory conditions but is also of direct atmospheric relevance.

Place, publisher, year, edition, pages
2014. Vol. 48, no 23, 13718-13726 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-111399DOI: 10.1021/es5033103ISI: 000345803800020OAI: diva2:775797


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

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Riipinen, Ilona
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