Modelling the cloud condensation nucleus activity of organic acids on the basis of surface tension and osmolality measurements

Z. Varga, G. Kiss, H. C. Hansson

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

In this study vapour pressure osmometry was used to determine water activity in the solutions of organic acids. The surface tension of the solutions was also monitored in parallel and then Köhler curves were calculated for nine organic acids (oxalic, malonic, succinic, glutaric, adipic, maleic, malic, citric and cis-pinonic). Surface tension depression is negligible for most of the organic acids in dilute (c) were determined for the organic acids using measured surface tension and water activity. It was found that critical supersaturation grew with growing carbon number. Oxalic acid had the lowest critical supersaturation in the size range studied and it was comparable to the activation of ammonium sulphate. The Sc values obtained in this study were compared to data from CCNC experiments. In most cases good agreement was found. For modelling purposes Sc vs. ddry plots are given and the dependence of water activity and surface tension on concentration are also formulated.

Original languageEnglish
Pages (from-to)4601-4611
Number of pages11
JournalAtmospheric Chemistry and Physics
Volume7
Issue number17
Publication statusPublished - 2007

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cloud condensation nucleus
surface tension
organic acid
supersaturation
modeling
oxalic acid
ammonium sulfate
vapor pressure
range size
surface water
water
carbon
experiment

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Modelling the cloud condensation nucleus activity of organic acids on the basis of surface tension and osmolality measurements. / Varga, Z.; Kiss, G.; Hansson, H. C.

In: Atmospheric Chemistry and Physics, Vol. 7, No. 17, 2007, p. 4601-4611.

Research output: Contribution to journalArticle

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