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

A new method was established to determine the iron in potassium ferrate(Ⅵ),and the mercuric chloric 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.