An evaluation of sulfur balance was conducted on a laboratory scale to provide an isothermal, low-operating-cost method for performing the simultaneous removal of H2S and SO2 gases through liquid-phase oxidation and reduction. The reaction was accomplished using a bubble column reactor as a gas-liquid contact system and a water-soluble metal complex ion capable of under going redox reactions in the process gas stream; this catalyst had a suitable electropotential for oxidizing sulfide ions to sulfur and/or for reacting sulfite ions with hydrogen sulfide. The most important aim of the experiment was to determine whether a H2S and So2 gas mixture could be converted to elemental sulfur through treatment with excess H2S in the Fe-EDTA liquid catalytic solution. The results of this investigation show that the H2S was completely oxidized to elemental sulfur, while SO2 was mainly converted to elemental sulfur with the remaining amount converting to soluble thiosulfate and sulfate forms.