キシレノールオレンジによる石油中の微量バナジウムの吸光光度定量

概要

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A rapid and highly sensitive method has been developed for the spectrophotometric determination of trace amounts of vanadium in petroleum with Xylenol Orange(XO). In the presence of cyclohexanediaminetetraacetic acid (CDTA), this method is extremely.specific for the determination of vanadium, because the other metals in petroleum are completely masked and do not interfere. Sample oil containing 540μg vanadium is ashed in the presence of concentrated sulfuric acid at 600700°C. The ash is dissolved in concentrated nitric acid and concentrated sulfuric acid and the vanadium is completely oxidized with potassium permanganate.Then, the solution is neutralized with 2 N sodium hydroxide solution to pH range from 3 to 5. To this solution are added 5 ml of 0.01M CDTA solution, 5 ml of acetate buffer solution (pH 4.6), 5 ml of 0.001M XO solution and distilled water to make up to 50ml. After 310 min, the absorbance at 550 mμ is measured against a reagent blank. The sensitivity of this method is 0.0026 μg. V/cm2. It can be also applied successfully to the determination of trace amounts of vanadium in various other samples.
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