Physico-chemical modelling of the sorption reactivity of true trace colloids

Physico-chemical model of trace hydrolyzed element adsorption by II-form of ion-exchange resin is considered. The model implies the existence of both ionic forms and trace hydroxide colloids in aqueous phase and predicts two sharp maxima separated by a plateau on the adsorption diagram. It is shown that complicated adsorption profile arises as a result of superposition of the trace hydroxide colloid formation/dissolution by-processes accompanied by irreversible ageing of the colloid.