Henry's law constants of some environmentally important aldehydes

Eric Betterton, M. R. Hoffmann

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Abstract

The Henry's law constants of seven aldehydes have been determined as a function of temperature by bubble-column and by head-space techniques. The compounds were chosen for their potential importance in the polluted troposphere and to allow structure-reactivity patterns to be investigated. The results (at 25°C) are as follows (in units of M atm-1): chloral, 3.44 x 105; glyoxal, ≥3 x 105; methylglyoxal, 3.71 x 103; formaldehyde, 2.97 x 103; benzaldehyde, 3.74 x 101; hydroxyacetaldehyde, 4.14 x 104; acetaldehyde, 1.14 x 101. A plot of Taft's parameter, Σσ*, vs log H* (the apparent Henry's law constant) gives a straight line with a slope of 1.72. H* for formaldehyde is anomalously high, as expected, but the extremely high value for hydroxyacetaldehyde was unexpected and may indicate that α-hydroxy-substituted aldehydes could have an unusually high affinity for the aqueous phase. The intrinsic Henry's law constants, H, corrected for hydration, do not show a clear structure-reactivity pattern for this series of aldehydes.

Original languageEnglish (US)
Pages (from-to)1415-1418
Number of pages4
JournalEnvironmental Science and Technology
Volume22
Issue number12
Publication statusPublished - Dec 1988
Externally publishedYes

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ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Environmental Engineering

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