Ion-exchange property of minerals.______________________________ 2 Radioactive waste disposal____________________________________ 3 Acknowledgements-___________________________________________ 4 Adsorption and ion exchange: General.______________________________ Colloid science ________________________________________________ 4 Colloids defined._______________________.__.______^___^___ 5 Classification of colloids.___________________________________ 5 Size of colloidal particles.__________________________________ 5 Examples of colloids.______________________________________