Conditioning of ion exchangers for adsorbing oxo anions

The present invention relates to the use of inorganic salts to increase the adsorption of oxo anions and / or their thio analogs of metal-doped ion exchangers, preferably of iron oxide / iron oxyhydroxide-containing ion exchangers, preferably with water or aqueous solutions, as well as the conditioning of these metal-doped ion exchanger enhanced adsorption opposite oxoanions and / or their thio analogs through the use of inorganic salts, with the exception of amphoteric ion exchangers which possess both acidic and basic groups as functional groups.