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高含量锰的测定,过去大多采用过硫酸铵或铋酸钠将锰氧化成高锰酸后进行容量测定的方法。由于破坏过量过硫酸铵时容易引起高锰酸的分解。如用铋酸钠氧化时,反应速度不是瞬间完成,高锰酸易与二价锰互相作用,产生在稀硝酸溶液中稳定的二氧化锰。因此应用以上两个方法测定高含量锰,没有正确控制条件时,往往易使结果偏低。1946年,林根(J.J.Lingane)等根据在pH=6～7的焦磷酸钠溶液中用高锰酸钾氧化二价锰为三价锰的原理测定锰。这一方法有二大优点:(1)不需经氧化过程,可直接滴定;
Determination of high manganese content, the past mostly used ammonium persulfate or sodium bismuth to oxidize manganese into permanganate capacity after the method of determination. As the destruction of excess ammonium persulfate easily lead to decomposition of permanganate. As with sodium bismuth oxidation, the reaction rate is not instantaneous, easy to interact with the divalent manganese permanganate, resulting in dilute nitric acid solution stable manganese dioxide. Therefore, the application of the above two methods for the determination of high manganese content, without proper control of the conditions are often easy to make the results low. In 1946, J.J.Lingane et al. Determined manganese based on the principle that potassium permanganate oxidizes divalent manganese to trivalent manganese in a solution of sodium pyrophosphate of pH = 6-7. This method has two major advantages: (1) without the oxidation process, can be titrated directly;