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不同地区的稀土矿,稀土元素的配分是不相同的。在用光度法测定稀土总量时,由于各单一稀土元素与显色剂形成的络合物的吸光度不同,其标准曲线的斜率也就不相同,这就给稀土标准的选择带来困难。即所谓光度法测定稀土总量的统一标准问题。多年来,许多分析工作者力求解决此问题,但由于所使用的显色剂如偶氮胂Ⅲ,偶氮氯膦mN等,其本身结构的原因,只能得到近似标准。华东师大对原偶氮氯膦型显色
Rare earth mines in different regions, the distribution of rare earth elements are not the same. When the total amount of rare earths is determined by photometry, the slope of the standard curve is different due to the difference in absorbance of the complex formed by each single rare earth element and the color former, which makes the selection of rare earth standard difficult. The so-called luminosity determination of the total amount of rare earth uniform standards. Over the years, many analysts have tried to solve this problem, but due to the inherent structure of the developers such as arsenazo III and chlorophosphonazo mN, only approximate criteria can be obtained. East China Normal University on the original chlorophosphonazo-color