References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-12-12227-2012

Surface/bulk partitioning and acid/base speciation of aqueous decanoate: direct observations and atmospheric implications

Prisle

N. L.

¹ Ottosson

² ⁴ Öhrwall

³ Söderström

² Dal Maso

¹ Björneholm

University of Helsinki, Department of Physics, P.O. Box 48, 00014, University of Helsinki, Helsinki, Finland

University of Uppsala, Department of Physics and Astronomy, Box 516, 75120, Uppsala, Sweden

University of Lund, MAX-lab, Box 118, 22100, Lund, Sweden

now at: FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands

21 12 2012

12 24 12227 12242

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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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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