高铁酸钾中总铁与高铁的测定

Determination of Total Iron and Ferrate(Ⅵ) in Potassium Ferrate(Ⅵ)

提出了以高氯酸代替经典方法中的二氯化汞氧化过量的氯化亚锡,重铬酸钾标准溶液滴定Fe2＋的无汞盐测定高铁酸钾中全铁的新方法。用该法测定高铁酸钾中的铁含量,其相对标准偏差为0.07%,且测定结果与经典法非常一致。以亚铬酸盐氧化还原反应为基础建立了高铁酸钾中高铁酸根的滴定分析方法。对滴定分析条件进行了进一步的研究,结果表明,用氢氧根离子浓度为16~17 mol.L^-1的亚铬酸盐溶液测定高铁时,所取高铁样品的质量影响所测的高铁含量。该方法简便、快速、准确,值得应用。

A new method was established to determine the iron in potassium ferrate（ Ⅵ ）, and the mercuric chlorie solution in the classical method was replaced with perchloric acid solution. Fe2＋ was titrated with potassium dichromate standard solution. The method was applied to determine the iron of potassium ferrate（ Ⅵ ） with the relative standard deviations of 0.07 %. The determination of potassium ferrate（ Ⅵ ）showed that consistent results were obtained by using chromite solutions with hydroxyl ion of 16-- 17 mol· L^- 1. The quality of potassium ferrate（Ⅵ ） affected the determination results.