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我们曾报道过钕-8-羟基喹啉-5-磺酸-茚三酮三元配合物光度法,新近又发现该试剂尚可用于测定镨、铒。而且对镨来说,形成的三元配合物其4f特征跃迁峰是迄今发现最灵敏的一个反应。然而灵敏度仍不能满足实用要求。为此我们采用了它的三阶导数光谱(同时可消除其它稀土的干扰),拟定了一个从混合稀土中直接测定钕、镨、铒的方法。实验手续:25mL容量瓶,加适量稀土试液,3.5mL混合试剂(0.05mol/L OXS,0.03mol/L NIN),5mL六次甲基四胺缓冲液(pH7.4),摇匀。以空白试剂为参比,扫描三阶导数吸收光谱。
We have reported neodymium-8-hydroxyquinoline-5-sulfonic acid-ninhydrin ternary complex photometry, and recently found that the reagent is still available for the determination of praseodymium, erbium. And praseodymium, the formation of the ternary complex 4f characteristic transition peak is by far the most sensitive one reaction found. However, the sensitivity still can not meet the practical requirements. To this end, we have adopted its third-order derivative spectroscopy (while eliminating the interference of other rare earths) and devised a method for the direct determination of neodymium, praseodymium and erbium from mixed rare earths. Experimental procedures: 25mL volumetric flask, add appropriate amount of rare earth solution, 3.5mL mixed reagent (0.05mol / L OXS, 0.03mol / L NIN), 5mL hexamethylenetetramine buffer (pH7.4), shake. With blank reagent as reference, the third-order derivative absorption spectra were scanned.