Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3832b&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3832
Physics
Scientific paper
To understand the environmental fate of mercury and to interpret mercury levels in ice cores, its air-snow partitioning has to be known. For non-reactive and non-dissociating elemental mercury, Hg(0), the adsorption enthalpy and standard adsorption entropy can best describe this partitioning equilibrium. We conducted experiments to determine the partitioning of mercury on ice using radioactive mercury isotopes and a chromatographic technique. A chromatographic column, which was packed with ice spheres, was exposed to a strong temperature gradient. The gas stream entered the column at 20 { oC}. The downstream end of the column was cooled to 190 {oC}. To start an experiment a short pulse of helium containing the radioactive mercury isotopes 192,193m,197m was fed into the carrier gas stream. After 20 minutes the carrier gas stream was stopped and the migrating position of mercury in the ice column was measured with a {γ}-counter}. The migration of mercury in the column lead to a well-defined and symmetric chromatographic peak. This indicates that reversible adsorption is the main process governing migration along the ice surface. Solvation into the surface layer at the higher temperature seems not to play a role. Based on the migration distance and the model of thermo-chromatography the adsorption enthalpy of mercury on ice was calculated. Environmental implication of our findings are shown.
Ammann Michael
Bartels-Rausch T.
Gaggeler Heinz W.
Jöri M.
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