根据液体火箭推进定型文件—《四氧化二氮技术条件》,四氧化二氮纯度测定方法为高锰酸钾滴定法 ,取样方式采用干冰取样法或充氮取样法。实践中化验结果经常出现超差 ( 0 .3% )。已做过的研究对负超差尚无明确结论 ,对正超差较普遍认为 ,参加滴定反应的硫磷混酸中含有还原性物 According to the liquid rocket propulsion profile - “technical conditions of nitrogen tetroxide,” four nitrogen dioxide purity determination of potassium permanganate titration method, the sampling method using dry ice sampling method or nitrogen sampling method. In practice, test results often appear overweight (0.3%). There have been no negative conclusions about the study has been done, the more positive difference is generally believed that the titration reaction to participate in the titration of mixed acid phosphoric acid reductant