Abstract：The sample was decomposed by nitric acid and hydrochloric acid. After removing the nitrogen oxides by boiling, the pentavalent vanadium in sample solution was reduced to tetravalent vanadium. In weakly acid solution, the ammonium molybdate could react with silicic acid to form silicon molybdenum yellow heteropoly acid, which was then reduced to silicon molybdenum blue by ammonium ferrous sulfate. The determination method of silicon in vanadium aluminum alloy by silicon molybdenum blue spectrophotometry was established. The results showed that the Beer's law was obeyed for silicon when its mass concentration in coloring solution was in range of 0.01-2.47 μg/mL. The linear regression equation of calibration curve was y=4.433 x with correlation coefficient of R2=0.999 3. The detection limit and lower determination limit of silicon in this method was 0.003 3% and 0.011% (mass fraction), respectively. The proposed method was applied to the determination of silicon in vanadium aluminum alloy sample. The relative standard deviations (RSD, n=8) of found results were between 0.17% and 0.52%. The recoveries were between 99% and 102%. The content of silicon in vanadium aluminum alloy sample was determined according to the experimental method, and the found results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry
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