催化动力学分光光度法测定微量铁的研究

Kinetic Sepectrophotometry Determination of Trace Iron

在 Na2 HPO4介质中 ,研究了 Fe( )催化 H2 O2 氧化甲基百里酚蓝褪色指示反应及其动力学条件 ,建立了测定痕量铁的新方法。方法的线性范围为 0 .0 2～ 0 .2 5μg/2 5m L,检出限为 0 .0 1 2 μg/2 5m L。用以测定过氧化碳酸钠 ( 2 Na2 CO3· 3H2 O2 )中的铁 ,结果令人满意。

A kinetic sepectrophotometry for the determination of trace iron has been developed. It is based on the reaction of methylthymol blue complexone with H 2O 2 in Na 2HPO 4 mediam by the catalysis of Fe 3+ . The linear range of the method is 0.02～0.25 μg/25 mL, and the detection limit is 0.012 μg/25 mL. The method has been used to determine trace Fe 3+ in 2Na 2CO 3·3H 2O 2 with satisfactory results.