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在ｐＨ５．１的ＨＡｃ－ＮａＡｃ介质中，铑（Ⅲ）催化高碘酸钾氧化偶氮胂Ⅲ褪色，据此建立了一个以偶氮胂Ⅲ褪色反应为基础的新催化动力学测定铑的方法。铑（Ⅲ）浓度在０．４～４．０μｇ／２５ｍＬ范围与ｌｏｇ（Ａ０／Ａ）有线性关系（ｒ＝０．９９８９，ｙ＝０．２７１０ｘ－０．０６５３），检出限为１．５×１０－１０ｇ／ｍＬ。方法用于实际样品中铑的测定，对８份试液测定的相对标准偏差为０．８％～１．９％，回收率为９８％～１０５％。
In the HAc-NaAc medium at pH 5.1, rhodium (Ⅲ) catalyzed the oxidation of arsenazo Ⅲ by potassium periodate, and established a new catalytic kinetic method for rhodium determination based on the arsenazo Ⅲ fading reaction . The linear range of rhodium (Ⅲ) was log (A0 / A) in the range of 0.4 ~ 4.0μg / 25mL (r = 0.9989, y = 0.2710x-0.0653) 5 × 10-10g / mL. The method was applied to the determination of rhodium in real samples. The relative standard deviations (RSDs) of the eight samples were 0.8% ~ 1.9% and the recoveries were 98% ~ 105%.