Redox reactions of Fe+3/ Fe+2 was investigated in the Solutions II2SO4, FeSO4, Na2S2O5, (NH4)2S2O8 and mixture of these compounds by electrocheınical nethods (pH = 2.8). For this purpose, current-potential curves were obtained for gold and platinum rotating disc electrodes by cyclic voltammetric and with the dropping mercury electrode by cyclic voltamrnetric, dif- ferential pulse polarography and D.C. polarography methods were used, The rotation rate of the disc electrode was 2200 rpm, the potential sweep rate was 3000 mV /min with the solid elec¬trode, and the potential sweep rate was 6000 mV / min, and one drops per second were selected for the mercury drop electrode.