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

Prisle, N. L.; Ottosson, N.; Öhrwall, Gunnar LU ; Soderstrom, J.; Dal Maso, M. and Bjorneholm, O. (2012) In Atmospheric Chemistry and Physics 12(24). p.12227-12242
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
12
issue
24
pages
12227 - 12242
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • wos:000312666100030
  • scopus:84871754539
ISSN
1680-7324
DOI
10.5194/acp-12-12227-2012
language
English
LU publication?
yes
id
54f0e9d7-3007-46af-a313-1971f4645ddb (old id 3512407)
date added to LUP
2013-02-20 15:00:00
date last changed
2017-10-22 03:17:47
@article{54f0e9d7-3007-46af-a313-1971f4645ddb,
  abstract     = {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.},
  author       = {Prisle, N. L. and Ottosson, N. and Öhrwall, Gunnar and Soderstrom, J. and Dal Maso, M. and Bjorneholm, O.},
  issn         = {1680-7324},
  language     = {eng},
  number       = {24},
  pages        = {12227--12242},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Surface/bulk partitioning and acid/base speciation of aqueous decanoate: direct observations and atmospheric implications},
  url          = {http://dx.doi.org/10.5194/acp-12-12227-2012},
  volume       = {12},
  year         = {2012},
}