Applications of ligand-exchange-III Preparation and properties of phenol-formaldehyde-based resin in the iron(III) form

A number of resins containing ethylenediamine acetic acid groups have been prepared, and these intermediates (resin-EDTA) converted into the iron(III) form. The capacities of these exchangers in the formation of iron(III)-phenol complexes have been studied and compared with those of the Chelex-iron(III) resin. The character of the exchanger matrix is very important in connection with the retention of phenols and with the elution order. The modified Amberlite CG 4B in the iron(III) form can be used for the quantitative separation of phenolic compounds, a separation that is not possible with the Chelex-iron(III) resin.