自从偶氮氯膦-mN合成以后,很多单位做了很多工作。我们针对以前钢铁中稀土总量的测定往往因其轻、重稀土比例不同而检量线不同的问题(特别是对于重稀土含量高的样品),而直接影响分析准确度等弊病,拟定了相应的分析方法。即利用偶氮氯膦-mN这同一种显色剂,不需萃取分离,直接光度法就可以测定钢铁中的稀土总量和轻、重稀土分量。且检 Since the chlorophosphonazo-mN synthesis, many units have done a lot of work. In the light of the problems of different calibration lines (especially for samples with high content of heavy rare earths), the determination of the total rare earths in the past steel often depends on the ratio of light and heavy rare earths, which directly affects the accuracy of the analysis. Analysis method. That the use of chlorophosphonazo-mN the same developer, without extraction separation, direct spectrophotometry can measure the total amount of rare earth and light and heavy rare earth elements in steel. And seized