Fe(Ⅱ)对Cr(Ⅵ)-I-体系诱导反应机理的研究

Study on Reaction Mechanism of Cr(Ⅵ)-I^- System Induced by Fe(Ⅱ)

本文考查了 Fe( ) - I- 、Cr( ) - I- 及 Cr( ) - I- - Fe( )体系的反应曲线 ,证明由于 Fe( )的引入 ,体系产生 Cr( )中间体并快速氧化 I- ;通过实验确定 Cr( ) - I- - Fe( )体系的化学计量关系 ,导出了诱导反应的机理及速率方程 ,并通过反应曲线的研究进一步证实了反应机理。对含铬废水中铬的测定起到一定作用。

The reaction mechanism of Cr(Ⅵ) I -system induced by Fe(Ⅱ) was studied by spectrophotometry.It was found that under the induction of Fe(Ⅱ),Cr(Ⅴ) as an intermediate is first formed,then it oxidizes I - to I 2 rapidly.The stoichiometric relationship of Cr(Ⅵ) I - Fe(Ⅱ) reaction system was determined experimentally.Based on the experimental results a mechanism of the induced oxidation reaction was proposed and the rate equation was also derived.