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对铀化物中的杂质元素,化学工作者通常是先将铀基体分离掉,然后再用分光光度、原子吸收等方法进行测定。但,迄今我们没有见到用原子吸收分光光度计以FAES为分析手段的测定铀化合物中铯元素的报道。铯的火焰原子吸收法测定,灵敏度较低。欲用加大样品量的方式去适应测定需要,势必给萃取分离带来困难。而具有较高灵敏度的FAES法可以满足测定要求。因铯的电离电位很低(3.95 eV),测定时存在严重的电离效应的不利影响,我们试图加入钾的硝酸盐予以消除;这一尝试终于取得了令人满意的效果。不过,出于对样品测定时信噪比的考虑,鉴于背景发射随钾盐量增加而增大,因而严格控制其钾的加入量是至关重要的。
For uranium impurity elements, chemical workers usually first separated uranium matrix, and then use spectrophotometry, atomic absorption and other methods were measured. However, so far we have not seen the determination of cesium in uranium compounds by atomic absorption spectrophotometry using FAES as a means of analysis. Cesium flame atomic absorption spectrometry, lower sensitivity. To increase the sample size to adapt to the measurement needs, is bound to give extraction separation difficulties. FAES method with higher sensitivity can meet the measurement requirements. Due to the very low ionization potential of cesium (3.95 eV), there was a detrimental effect of the severe ionization effect on the determination, and we attempted to eliminate the addition of potassium nitrate; this attempt finally yielded satisfactory results. However, due to the signal-to-noise ratio considerations for sample determination, it is crucial to strictly control the amount of potassium added as the background emission increases with increasing potassium salt content.