Abstract
Trace element distribution in systems in which colloids and coarse solid particles are present is determined by the following sorption equilibria: sorption of trace elements on coarse particles A, sorption of trace elements on particles of colloidal dimensions B and sorption of B on A. Experiments are carried out by shaking kaolinite with water in the presence of Cu2+ at pH 4.4. The concentration of colloids in solution is determined photometrically and by ICP-AES. It increases with temperature and intensity of shaking. Distribution ratios of trace elements which are found experimentally depend strongly on the pore size of the filters used for separation of solution and solids. They often increase with the ratioV (volume of solution):m (mass of solid) which is shown to be due to the sorption equilibrium of B on A.
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