A new catalytic kinetic method for determining trace selenium(Ⅳ) was described.Se(Ⅳ) can catalyze the discolouring of 2-(5-Bromo-2-Pyridylazo)-5-diethylaminophenol(5-Br-PADAP) by potassium chlorate in hydrochloric acid medium.The detection limit for Se(Ⅳ) is 5.7×10-5μg/ml.The linear range of determination is 0～0.4μg/25ml Se(Ⅳ).Satisfactory results may be obtained by direct determination of trace Se(Ⅳ) in human hair.
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