Physics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116110b&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 16, CiteID L16110
Physics
13
Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Hydrology: Snow And Ice (1827), Mineral Physics: Surfaces And Interfaces, Oceanography: Physical: Ice Mechanics And Air/Sea/Ice Exchange Processes
Scientific paper
The air - ice partitioning of acetone to four different laboratory ice and natural snow samples was investigated at a surface coverage between 0.1 and 6% and temperatures between 198 and 223 K using a chromatographic column coupled to an atmospheric pressure chemical ionization mass spectrometer. The adsorption enthalpy and entropy were obtained from the temperature dependence of the measured partitioning coefficient. No significant difference was found among the four ice and snow samples substantially differing in crystallinity and chemical composition. An average adsorption enthalpy of 52 +/- 2 kJ/mol and a standard adsorption entropy of -96 +/- 16 J/(mol K) was obtained. A short outlook on partitioning coefficients under atmospheric conditions is given, and the adsorption mechanism is discussed based on the adsorption entropy and enthalpy found.
Ammann Michael
Bartels-Rausch T.
Gaggeler Heinz W.
Guimbaud C.
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