The Henry's law constant of trifluoroacetic acid and its partitioning into liquid water in the atmosphere

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • D. J. Bowden
  • S. L. Clegg
  • P. Brimblecombe

Detail(s)

Original languageEnglish
Pages (from-to)405-420
Journal / PublicationChemosphere
Volume32
Issue number2
Publication statusPublished - Jan 1996
Externally publishedYes

Abstract

The Henry's law constant of trifluoroacetic acid [K(H') (mol kg-1 atm-1), for the equilibrium CF3COOH((g)) ⇆ CF3COOH((aq))] has been determined from measured partial pressures over aqueous solutions at 278.15, 298.15 and 308.15 K, and is given by: In(K(H')) = 9.099-9.328 x 103(1/T(r)-1/T) where T (K) is temperature and T(r) is equal to 298.15 K. Accuracy is estimated to be ± 25% in K(H'), partly limited by uncertainties in the pK(a) of the acid (0.47 at all temperatures, from literature data). Trifluoroacetic acid in the atmosphere will partition entirely into fog and cloud water (0.05-1.0 g H2O m-3), but can reside in both phases for the liquid water contents typical of aerosols (10-5-10-4 g H2O m-3) depending on aerosol pH and to some extent on composition.

Citation Format(s)

The Henry's law constant of trifluoroacetic acid and its partitioning into liquid water in the atmosphere. / Bowden, D. J.; Clegg, S. L.; Brimblecombe, P.
In: Chemosphere, Vol. 32, No. 2, 01.1996, p. 405-420.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review