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在卤离子存在下,Fe(Ⅲ)络合物与金属银之间的氧化还原反应,可用氧化形成的卤化银的电化学还原时间τ进行测定。本工作用银旋转圆盘电极研究了在改变氧化时间,反应物浓度和电极旋转速度的情况下,Fe(Ⅲ)络合物与金属银之间反应动力学,并测定了形成溴化银的初始速率与pH的关系。 该氧化还原反应是扩散控制反应,对于Fe(Ⅲ)EDTA和卤离子来说均为一级反应。Fe(Ⅲ)EDTA在水溶液中的扩散系数可由极限电流与Fe(Ⅲ)EDTA的浓度和银旋转圆盘电极的旋转速度的平方根之间的关系求算出来。
The redox reaction between the Fe (III) complex and the metallic silver in the presence of halide ions can be determined by the electrochemical reduction time τ of the silver halide formed by oxidation. In this work, the reaction kinetics between Fe (Ⅲ) complex and metallic silver was investigated by using silver rotating disk electrode under the condition of changing oxidation time, reactant concentration and electrode rotation speed. Relationship between initial rate and pH. The redox reaction is a diffusion controlled reaction, which is a first order reaction for Fe (III) EDTA and halide ions. The diffusion coefficient of Fe (Ⅲ) EDTA in aqueous solution can be calculated by the relation between the limiting current and the square root of the rotating velocity of Fe (Ⅲ) EDTA and the rotating speed of silver rotating disk electrode.