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利用钒的新指示反应建立了一个非常灵敏的测定痕量钒催化动力学分光光度法。它基于在热的稀硫酸溶液中,有抗坏血酸存在时,劳氏紫与溴酸钾反应受钒(V)催化而吸光度降低。方法灵敏度为3.11×10~(-13)g/ml。测定范围分别为0～12 ng/25 ml和12～20ng/25ml钒。本方法可用于水、人发、煤样品中痕量钒的测定。
The use of a new indicator of vanadium has established a very sensitive method for the determination of trace vanadium by catalytic kinetic spectrophotometry. It is based on the reaction of vanillin with potassium bromate under the action of vanadium (V) in the presence of ascorbic acid in a hot dilute sulfuric acid solution to reduce the absorbance. The sensitivity of the method was 3.11 × 10 ~ (-13) g / ml. The measurement range is 0-12 ng / 25 ml and 12-20 ng / 25 ml vanadium, respectively. The method can be used for the determination of trace vanadium in water, human hair and coal samples.