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研究了稀土离子-钛铁试剂水溶液体系的三阶及四阶导数光谱.在0.05～0.3mol·dm~(-3)的氢氧化钠溶液中,镨、钕、钐、镝、钬、铒、铥与钛铁试剂形成具有f-f跃迁吸收光谱的配合物.在紫外及可见区域内,它们各自有特征的吸收峰.其高阶导数光谱不仅灵敏度比常规吸收光谱增大了许多倍,且选择性也有很大的提高.如以峰一峰法测量四阶导数光谱,铒的导数摩尔吸光系数已达3.2×10~3L·mol~(-1)·cm~(-1).本文拟定了用稀土离子-钛铁试剂体系高阶导数光谱法测定混合稀土中镨、钕、钐、镝、钬、铒、铥的简便方法.和同类方法相比,本法具有灵敏度高、分析元素多、不需任何分离步骤和使用有机溶剂等优点.
The third and fourth derivative spectra of the rare earth ion-ferrotitanium reagent aqueous solution have been studied. Among the sodium hydroxide solution of 0.05-0.3mol · dm -3, praseodymium, neodymium, samarium, dysprosium, holmium, erbium,铥 forms complexes with ferroferric ions with ff transition absorption spectra, and each has its own characteristic absorption peak in the UV and visible regions. Not only does its higher-order derivative spectrum increase in sensitivity many times over conventional absorption spectra, but also selectivity And the molar extinction coefficient of erbium reached 3.2 × 10 ~ 3L · mol ~ (-1) · cm ~ (-1) as measured by FY-IV method.In this paper, Determination of praseodymium, neodymium, samarium, dysprosium, holmium, erbium, and plutonium in mixed rare earth by high-order derivative spectrometry with ion-ferrotitanium reagent system. Compared with similar methods, this method has the advantages of high sensitivity, Any separation step and the use of organic solvents and so on.