通常,对于高碳铬铁中铬的测定,无疑是采用过氧化钠熔融,然后将熔融物浸出,用酸中和酸化,再经过硫酸铵氧化后用亚铁滴定。过去,国内也有些分析工作者试图为了加快分析速度,曾提出以焦硫酸钾、高氯酸、磷酸、硫酸为混合溶剂用湿熔法分解试样。但应用此法时的样品必须经研磨其粒度均在200目以上,我们曾应用该法并未感到省时、经济。 In general, for the determination of chromium in high-carbon ferrochrome, it is undoubtedly melting with sodium peroxide, leaching the melt, neutralizing with acid, and titrating with ferrous sulfate after oxidation with ammonium sulfate. In the past, some domestic analysts tried to speed up the analysis of the speed, it has been proposed with potassium pyrophosphate, perchloric acid, phosphoric acid, sulfuric acid as a mixed solvent with wet melting decomposition of the sample. However, when using this method, the sample must be ground with a particle size of 200 mesh or more. We did not find it time-saving and economical to apply this method.