RECENT EXPERIMENTAL WORK ON SOLUTE REDISTRIBUTION AT THE ICE/WATER INTERFACE. IMPLICATIONS FOR ELECTRICAL PROPERTIES AND INTERFACE PROCESSES

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Abstract
Redistribution of NaF, HCl, NaCl, NH4F, and AFGP at the ice/water interface have been investigated under near-equilibrium constrained growth conditions. The distribution coefficient of NaF-declined from 2 x 10-1 (at 10-6 N initial liquid concentration) to 3 x 10-3 (at 10-2 N). By contrast, the distribution coefficient of the two chlorides was 3 x 10-3 and invariant with initial liquid concentrations in the range 5 x 10-6 N to 5 x 10-4 N. At 10-6 N concentration of the mother solution, the distribution coefficient of NH4F was found to be strongly pH dependent. AFGP is the most highly soluble of known impurities in ice, with a distribution coefficient close to unity. In unstirred solutions, traces of AFGP in the mother solution caused an increase in the distribution coefficient of HCl due to instabilities in the flux fields of heat and solute

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