Abstract
The effective distribution coefficient K eff was measured spectrophotometrically for K + in melted ice which grew unidirectionally from water solution (0.01–5 wt%) of KOH. For the initial concentration C 0 larger than 0.1 wt%, ice was dendritic, of milky appearance, and the value of K eff was about 0.10 for a crystal with the c-axis in the direction of growth ( C v grain), while it was about 0.15 if the c-axis was perpendicular to the direction of growth ( C h grain). This anisotropy in the impurity entrapment disappeared for C 0 smaller than 0.1%. Then, the ice crystals were transparent and K eff was about 10 −3. For dendritic ice the coefficient K eff decreases with an increase in the concentration C 0. During the freezing a nucleation and preferred growth of parasite crystals took place on the interface of both C v and C h grains.
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