Uptake of acetone, 2-butanone, 2,3-butanedione and 2-oxopropanal on a water surface

Abstract

The uptake of acetone, 2-butanone, 2,3-butanedione and 2-oxopropanal on pure water was investigated by means of a single drop experiment. This method allows to follow the concentrations in an aqueous drop in situ by UV-VIS-spectroscopy. Due to Henry's law saturation, the uptake coefficients γ_meas decreased with time. Maximum values (T = 293 K) of 1.8 × 10⁻⁴, 1.5 × 10⁻⁴, 8 × 10⁻⁵ and 1.2 × 10⁻⁴ were observed for acetone, 2-butanone, 2,3-butanedione and 2-oxopropanal, respectively. A fit of the experimental data to the resistance model and correction for the effect of gas phase diffusion yield values for the mass accommodation coefficients α_acetone = (5.4_−2.6^+4.5) × 10⁻³, α_2-butanone = (2.1_−0.8^+0.9) × 10⁻³, α_{2,3-butanedione} = (1.0 ± 0.3) × 10⁻⁴ and α_{2-oxopropanal} = (1.5 ± 0.5) × 10⁻⁴. A separate model approach is used to discuss the impact of turbulent mixing of the drop.