本文研究了在稀盐酸介质中,邻菲啰啉活化Fe(Ⅲ)催化H_2O_2氧化硫代米氏酮的慢反应,用萃取手段控制反应时间,在525nm下测定水相中氧化产物吸光度的增加,建立了测定Fe(Ⅲ)的萃取催化动力学分析新方法。方法的检测限为0.5μg/miFe(Ⅲ),线性范围为0.5—4.5μg/mlFe(Ⅲ)。用于水样中Fe(Ⅲ)的测定,结果满意。 In dilute hydrochloric acid medium, the slow reaction of Fe (Ⅲ) catalyzed oxidation of thiomorphone with H 2 O 2 by 1,10-phenanthroline was studied. The reaction time was controlled by extraction and the increase of absorbance of the oxidation products was measured at 525 nm. A new method for the determination of Fe (Ⅲ) by catalytic kinetic analysis was established. The detection limit of the method was 0.5 μg / mi Fe (Ⅲ) and the linear range was 0.5-4.5 μg / ml Fe (Ⅲ). For water samples Fe (Ⅲ) determination, the results are satisfactory.