The preparation of simple electron-exchange columns is reported. An organic porous material (Kel-F powder) is used to support a water-insoluble redox reagent. Of the organic compounds tested, tetrachlorohydroquinone was best. Very stable columns were obtained with a sufficiently high redox capacity (1.59 meq g dry material) and a satisfactory reaction rate. The following oxidation reactions were carried out: Fe 2+→Fe 3+, Cu +→Cu 2+, Sn 2+→Sn 4+, I -→I,ascorbic acid → dehydroascorbic acid, as well as the following reduction reactions: Fe 3+→Fe 2+, I→I -, Ce 4+→Ce 3+, V 5+→V 4+, Cr 6+→Cr 3+. The effect of hydrogen ion concentration on the redox reactions was also studied. The Kel-F-tetrachlorohydroquinone columns can be used for indirect titration of redox systems and for selective oxidations or reductions, e.g. Fe 3+ in presence of Fe 2+ and vice versa, Cr 6+ in presence of Fe 3+, Ce 4+ in presence of Ce 3+, ascorbic acid in the presence of glucose, and Sn 2+ in presence of Sn 4+ or Fe 2+.