A colloidal solution can be purified by the following method of
dialysis
peptization
filtration
oxidation
Purification of Colloidal Solution -
Dialysis
- wherein
It is a process of removing a dissolved substance from a colloidal solution by means diffusion through a suitable membrane.
Purification of Colloidal Solution -
Electrodialysis
- wherein
The process of dialysis is quite slow. It can be made faster by applying an electric field if the dissolved substance in the impure colloidal solution is only an electrolyte. The process is then named electrodialysis.
Purification of Colloidal Solution -
Ultrafiltration
- wherein
Ultrafilteration is the process of separating the colloidal particles from the solvent and soluble solutes present in the colloidal solution by specially prepared filters, which are permeable to all substances except the colloidal particles. It is a slow process.
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