Abstract：In order to improve the control efficiency of vanadium hydrometallurgy process, a method for the determination of vanadium content by hydrogen peroxide spectrophotometry based on the coloring characteristics of peroxide-vanadium ion [VO(O2)+] was proposed, realizing the rapid determination of vanadium content in sample on site. Firstly, the pH of sample solution was adjusted to 9-10 by adding appropriate amount of sodium hydroxide solution. Hydrogen peroxide was added to fully oxidize the low-valence vanadium to vanadium (V). Then sulfuric acid was added to adjust the solution to be acid. Vanadium (V) could react with hydrogen peroxide at room temperature to form a stable red-brown peroxide-vanadium ion [VO(O2)+]. The absorbance was measured at 450 nm. The Bill's law was obeyed between the absorbance and mass concentration of vanadium in range of 2.0-400 mg/L. The contents of vanadium in three vanadium extraction liquid samples of hydrometallurgy (including vanadium leaching solution, solution after vanadium precipitation, and wastewater) were determined according to the experimental method. The relative standard deviation (RSD, n = 10) of determination results was 0.38%, 3.5% and 7.6%, respectively. The found results were consistent with those obtained by potassium permanganate oxidization-ammonium ferrous sulfate titration method.
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