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| Titel |
Surface/bulk partitioning and acid/base speciation of aqueous decanoate: direct observations and atmospheric implications |
| VerfasserIn |
N. L. Prisle, N. Ottosson, G. Öhrwall, J. Söderström, M. Maso, O. Björneholm |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 24 ; Nr. 12, no. 24 (2012-12-21), S.12227-12242 |
| Datensatznummer |
250011689
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| Publikation (Nr.) |
 copernicus.org/acp-12-12227-2012.pdf |
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| Zusammenfassung |
| Dilute aqueous solutions of the atmospheric organic surfactant sodium
decanoate have been studied using surface sensitive X-ray photoelectron
spectroscopy combined with synchrotron radiation. We studied the
decanoate/decanoic acid speciation and preferential adsorption at the
vapor–liquid interface, and the responses to mixing in solution with some of
the most common atmospheric inorganic ions, Na+,
NH4+, Cl−, and
SO42−. We observe little or
no influence of Na+, Cl−, or
SO42− ions, on neither the relative speciation nor the
individual adsorption properties of decanoate and decanoic acid. In
particular, no significant salting-out effect due to common Na+
cations of the organic and inorganic salts was observed for these solutions.
On the other hand, mixing with NH4+ cations resulted in a pronounced
surface enhancement of decanoic acid, which is attributed to surface specific
acid–base chemistry. These changes in surface/bulk partitioning and surface
speciation may significantly affect properties of aqueous droplets containing
decanoate/decanoic acid, and potential implications for several processes
critical to the climate effects of atmospheric aerosols are discussed. |
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