碘量法测定电解液中锰酸钾和高锰酸钾

Determination of Potassium Manganate and Potassium Permanganate in Electrolyte by Iodometry

建立了一种测定高锰酸钾生产电解液中锰酸钾和高锰酸钾的分析方法。以钡盐沉淀分离电解液中的MnO_4^(2-),用碘量法测定溶液中的高锰酸钾含量;同时,另取一份相同电解液,用碘量法测定锰酸钾和高锰酸钾的总量,间接得到锰酸钾的含量。对电解液中锰酸钾和高锰酸钾含量进行了多次平行测定,锰酸钾相对标准偏差为0.11%,高锰酸钾为0.14%;高锰酸钾的加标回收率为96.9%。将方法应用于实际样品分析,测定结果与参照方法一致。该法操作简单,终点变色灵敏,结果准确,试剂用量少、污染小,可用于高锰酸钾生产过程的质量控制。

A method was established for the determination of potassium manganate and potassium permanganate in potassium permanganate production electrolyte. Mn O4^2-was separated from the electrolyte by barium salt precipitation,and then the content of potassium permanganate in the solution was determined by iodometry. At the same time,took another one of the same electrolyte,the total content of potassium permanganate and potassium permanganate were determined by iodometry; and the content of potassium manganate could be obtained indirectly. Repeated measurements showed that the relative standard deviation of potassium manganate was 0. 11 % while that of the potassium permanganate was 0. 14 %; the standard addition recovery rate of potassium permanganate was 96. 9 %. The method was applied to practical sample analysis,the results were consistent with the reference method. This method is simple in operation,and has the advantages of sensitive end point color,accurate results,low reagent consumption and less pollution,which can be used for the quality control of potassium permanganate production process.