甲苯胺蓝褪色指示反应动力学光度法测定痕量铁

Catalytic Kinetic Spectrophotometric Determination of Trace Iron

研究了在硫酸介质中 ,痕量铁催化 H2 O2 和 K2 Cr O7联合氧化甲苯胺蓝褪色反应及其动力学条件 ,建立了催化动力学测定痕量铁的新方法。检出限为9.6 6× 10 -9g· m L-1 ,测定的线性范围为 0～ 0 .6μg/2 5 m L。方法已用于矿泉水、莱服子、菊花。

A new catalytic method for determining trace iron was described.Fe(Ⅲ) could catalyze the discolouring oxidizing reaction of toluidine blue by hydrogen peroxide and potassium dichromate in sulfuric acid medium.The detection limit is 9.66×10 -9 g·mL -1 .The linear range of determination is 0～0.6μg/25mL Fe(Ⅲ).Satisfactory results were obtained for the determination of trace Fe(Ⅲ) in mineral water,radish seed,chrysanthemum ,rice and peanuts.