ABSTRACT
Iodide (I) is very strongly retained by anion exchange resins from dilute acid, neutral, and alkaline solutions. The most effective eluent for adsorbed iodide is sodium hypochlorite (NaOCl). In water samples I can exist in several different valency states. When using the column technique to adsorb iodide from milk samples, both fresh milk and a fast flow rate are essential, because milk will clog the resin bed if it is allowed to turn sour. Adsorption of iodide and other I species on anion exchange resins is the basis of numerous separation methods which have been used in connection with the determination of I in natural materials, that is, soils and rocks, waters, biological fluids cheese and rat thyroid as well as in industrial products. A preliminary oxidation-reduction step is required to convert all the I to the strongly adsorbed iodide form.
