7～14. The PH value is a method of measuring the PH value of an aqueous solution. The complex iron desulfurization technology is a wet oxidation method for removing hydrogen sulfide using complex iron as a catalyst. It is characterized by directly converting H2S into elemental sulfur and complexing it. Iron process technology is a new desulfurization technology with simple process, high flexibility in regulating the working sulfur capacity, and is environmentally friendly and non-toxic. Generally, a higher pH value can improve the reaction efficiency, promote the formation of thiosulfate ions, and reduce the absorption of oxygen, but it also hinders the condensation of elemental sulfur; a low pH value will hinder the absorption of H2S, so the pH value should be controlled as Alkaline aqueous solution of 7 to 14.