Henry's law constants of some environmentally important aldehydes

Journal Article · Thu Dec 01 00:00:00 EST 1988 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00177a004· OSTI ID:6259883

Betterton, E A; Hoffmann, M R

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/degree/C) are as follows (in units of M atm/sup /minus/1/): chloral, 3.44 /times/ 10/sup 5/; glyoxal, greater than or equal to3 /times/ 10/sup 5/; methylglyoxal, 3.71 /times/ 10/sup 3/; formaldehyde, 2.97 /times/ 10/sup 3/; benzaldehyde, 3.74 /times/ 10/sup 1/; hydroxyacetaldehyde, 4.14 /times/ 10/sup 4/; acetaldehyde, 1.14 /times/ 10/sup 1/. A plot of Taft's parameter, ..sigma..sigma*, 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 ..cap alpha..-hydroxy-substituted aldehydes could have an usually 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.

• Research Organization: California Institute of Technology, Pasadena (USA)
• OSTI ID: 6259883
• Journal Information: Environ. Sci. Technol.; (United States), Vol. 22:12
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ALDEHYDES
STRUCTURE-ACTIVITY RELATIONSHIPS
ACETALDEHYDE
AIR POLLUTION
BENZALDEHYDE
CHLORAL
FORMALDEHYDE
GLYOXAL
TROPOSPHERE
EARTH ATMOSPHERE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
POLLUTION
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)