Methyl ethyl ketone (MEK), otherwise known as 2-butanone has been found in low concentrations in snow and ice. Henry’s law constants for MEK in liquid water have been determined, but its behavior over the surface of snow is unknown. Complicating these interactions, it has also been shown that the surface of snow and ice with impurities has a patchy coverage of liquid water. Two different experiments, static and dynamic, have been used in order to measure the equilibrium of MEK over artificial snow. For the static experiment, a closed system of snow with MEK is allowed to reach equilibrium and then headspace gas measurements are taken via gas chromatography - mass spectroscopy (GC-MS) over a range of temperatures from -30oC to +15oC. The concentration of MEK solutions were varied as well as the size of the artificial snow grains. In addition to the static experiment, a dynamic flow tube experiment is used in conjunction with mass spectroscopy in order to observe small ketones desorbing from ice surfaces. The equilibria observed by both methods will be quantified and compared.

Determination of the equilibrium for 2-butanone with ice surfaces via static and dynamic experiments

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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