锰锌铁氧体中二价铁与三价锰的测定,国内尚属难题。文献提出的测定方法是在磷酸介质中,以亚硫酸钠将Mn~(3+)还原为Mn~(2+),在惰性气氛下测定Fe~(2+);另取样品用磷酸溶解,Fe~(2+)与Mn~(3+)定量进行反应,测定溶液中剩余的Fe~(2+)或Mn~(3+),用减差法求得Mn~(3+)的含量。应用上述方法测定Fe~(2+)与Mn~(3+)的缺点是在磷酸介质中,亚硫酸钠只能部分消除Mn~(3+)对Fe~(2+)的干扰,故测得的Fe~(2+)量结果偏低。并随着样品中Fe~(2+) Mn-Zn ferrite in the determination of ferrous and trivalent manganese, the domestic is still a problem. The method proposed in the literature is to reduce Mn ~ (3+) to Mn ~ (2+) with sodium sulfite in a phosphoric acid medium and to measure Fe ~ (2+) in an inert atmosphere. Another sample is dissolved with phosphoric acid, (2+) and Mn ~ (3+) were quantitatively measured to determine the remaining Fe 2+ or Mn 3+ in the solution. The content of Mn 3+ was determined by the subtraction method. The disadvantage of measuring Fe 2+ and Mn 3+ using the above method is that in the phosphoric acid medium, sodium sulfite can only partly eliminate the interference of Mn 3+ to Fe 2+, Fe ~ (2+) results are low. And with the sample Fe ~ (2+)