Amphoteric ion exchangers for adsorbing oxo anions

The present invention relates to the use of amphoteric ion exchanger for the adsorption of oxo anions, preferred is the use of iron oxide / iron oxyhydroxide-containing amphoteric ion exchangers for the removal of oxo anions from water and aqueous solutions, and the preparation of these amphoteric iron oxide / iron oxyhydroxide-containing ion exchangers.