Abstract：Trace Se(Ⅳ) can catalyze the discolouring oxidizing reaction of RDB with potassium bromate in nitric acid medium, and the conditions of kinetics has been studied in detail. A new method of kinetics spectrophotometry for determination of trace(Ⅳ) is established. The sensitivity of the method is 0.905 μg·L-1. The range of measurement is 0-9.6 μg·L-1. The method has been used for determining trace Se(Ⅳ) in Chinese herbal medicine with satisfactory results.
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