The ion uptake mechanism of allophane

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Abstract
Rather greater variations in the cation exchange capacity (CEC) value of Allophane, say, 20 to 100 me per 100 g of clay (1), have been reported by a number of investigators. BIRRELL and his collaborators (5, 6) revealed that the CEC of allophane depends on concentration and pH of a leaching solution, kinds of cation and anion, volume of washing alcohol, and its water content. The results suggest the peculiarity of allophane in ion-exchange phenomena.