催化动力学光度法测定痕量铁(Ⅲ)

DETERMINATION OF TRACE IORN (Ⅲ) BY KINETIC SPECTROPHOTOMETRY

在硫酸介质中,痕量铁(Ⅲ)能灵敏地催化高碘酸钾氧化偶氮氯膦Ⅲ褪色。研究了反应的最佳条件,建立了测定痕量铁(Ⅲ)的新方法。方法检出限为9.1×10-8gFe3+/L,测定范围0-0.10μgFe3+/25mL,用于测定纯有机溶剂中的痕量铁(Ⅲ),获得了满意的结果。

In H_2SO_4 medium,trace Fe(Ⅲ) can sensitively activate the indicating oxidative discolpretion of chlorphosphonozo(Ⅲ) with KIO_4.The optimum condition and kinetic parameters are investigated and evaluated,a method for determination of trace Fe(Ⅲ) is proposed.The detection limit is 9.1×10^(-8) g/L,and the linear range is 0-0.10 μg/25 mL Fe(Ⅲ).It has been applied to the determination of trace Fe(Ⅲ) in organic solvents with satisfactory results.