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锰矿中(特别是碳酸锰)除了测定锰以外,一般还要测定氧化钙。测定氧化钙的方法,一般是先将铁,铝,锰等分离,然后作草酸钙的沉淀,以容量法测定。锰的测定则多用氧化锌法或高硫酸铵法,但也有把锰变为二氧化锰,再以亚铁盐或草酸定量。这个几乎被忘记了的方法,根据我们的试验,如用标准锰矿来标定所用的滴定溶液,亦可得到符合要求的结果。我们提起使锰变成二氧化锰来测定锰,是为了利用测定氧化钙时所必需除去的锰(呈二氧化锰的形态),将它溶解在一定量的草酸溶液中,然后以高锰酸钾回滴,这样可以比任何测定锰的方法都可节省时间2～3倍。现将分析手续略述如下。
Manganese ore (especially manganese carbonate) in addition to the determination of manganese, the general also measured calcium oxide. Determination of calcium oxide method, the general first iron, aluminum, manganese and other separation, and then precipitation of calcium oxalate, by volume method. The determination of manganese is more zinc oxide or ammonium sulfate method, but there are manganese into manganese dioxide, and then ferrous or oxalic acid quantitative. This almost forgotten method, based on our own experimentation, such as titrating the titration solution with standard manganese ore, yields satisfactory results. In order to use the manganese (in the form of manganese dioxide) necessary for the determination of calcium oxide when we turn manganese into manganese dioxide to measure the manganese, it is dissolved in a certain amount of oxalic acid solution and then treated with potassium permanganate Potassium drop back, so that than any method of measuring manganese can save time 2 to 3 times. Analysis procedures now outlined below.