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MnO_2的测定,一般用草酸盐法。由于草酸与MnO_2作用缓慢,需长时间加热浸取,在此过程中,溶液酸度、温度、体积、阳光对草酸稳定性均有影响,特别是在Mn~(2+)存在下,这种影响就更大。亚铁盐法稳定性差。本文系利用Mn~(2+)与Mn~(4+)作用生成Mn~(3+),用亚铁溶液滴定Mn~(3+),求得Mn0_2含量。我们在前人基础上,选择了最佳条件,探明了干扰物,经用于锰矿中MnO_2的测定,效果良好,方法简易快速、准确度与重现性好。分析手续:称取0.1-0.2克样品于250毫升
Determination of MnO_2, generally oxalate method. Due to the slow action of oxalic acid and MnO 2, it needs to be heated and leached for a long time. During this process, acidity, temperature, volume and sunshine affect the stability of oxalic acid, especially in the presence of Mn 2+ Even bigger. Ferrous salt method is poor stability. In this paper, Mn ~ (3+) was generated by the reaction of Mn ~ (2+) and Mn ~ (4+), and Mn ~ (3+) was titrated by ferrous solution. On the basis of our predecessors, we chose the best conditions and proved that the interferences were used for the determination of MnO_2 in manganese ore. The result is good, the method is simple and fast, the accuracy and reproducibility are good. Analysis procedures: Weigh 0.1-0.2 g sample in 250 ml