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在各种矿石与矿物中直接测定含量在10~(-3)-10~(-4)％的铀具有很大的实际意义。在我们所知的一些文献中,作者们都未能获得较高的灵敏度。此外,在上述这些文献中有一篇,由于标准样品与被分析样品的化学成份不完全符合,因而发生了工作曲线的位移。制备适合于分析各种不同化学组分的矿石与矿物的标准,会遇到严重的困难。在采用了以被分析的样品制备标准并以增量法进行分析之后,我们克服了这些困难。大家知道,铀就象大多数难挥发元素一样,具有不高的光谱灵敏度。
It is of great practical significance to directly measure uranium in the range of 10 -3 to 10 -4% in various ores and minerals. In some of the literature we know, the authors failed to achieve high sensitivity. In addition, there is an article in the above documents in which displacement of the working curve occurs because the chemical composition of the standard sample and the sample to be analyzed are not completely matched. There are serious difficulties in preparing standards suitable for the analysis of ores and minerals of various chemical compositions. We have overcome these difficulties after adopting the analytical standards for sample preparation and the incremental method. As we all know, uranium, like most of the less volatile elements, has a low spectral sensitivity.