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《中华人民共和国药典》以磁石含量为质检指标，但所载方法滴定时无明显终点或指示剂变色模糊，无法得出肯定结果。本实验从高锰酸钾加入的程度、硫磷酸及二苯胺磺酸钠指示剂周量等，对《中华人民共和国药典》所载方法进行了探讨与改进。经加入回收试验（平均回收率为９９．３９％）证明，改进后的方法准确可靠，实用性强。
“The People’s Republic of China Pharmacopoeia” took the magnetite content as the quality inspection index, but there was no obvious end point or discoloration of the indicator during the titration method contained in the method, and no definitive results could be obtained. In this experiment, the method contained in the “Pharmacopoeia of the People’s Republic of China” was discussed and improved from the degree of potassium permanganate addition, the sulfur phosphoric acid, and the amount of sodium diphenylamine sulfonate indicator. The added recovery test (average recovery rate of 99.39%) proved that the improved method is accurate and reliable, and has strong practicality.