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文献中有关铀中微量稀土的测定,主要采用化学分离后光谱测定的方法。分离方法有萃取,纤维色层,离子交换及沉淀法等,一般都较繁杂费时,本文基于阳离子交换分离-溶液干渣光谱测定的方法。只在前人的工作基础上有所改进:(1)光谱测定方面,选用钠作外加基体,而不用保护气氛装置;(2)化学分离方面,采用树脂层高度为5.5厘米的阳离子交换柱。其特点是:分离速度较快,样品中允许有较高含量的其他杂质,适用性较宽。取样5克铀时,钆、镝、钐、铕的测定下限均达到0.01ppm,满足了UF_6产品的技术指标。
Literature on the determination of trace amounts of rare earth uranium, the main method used after chemical separation spectrometry. Separation methods are extraction, fiber chromatography, ion exchange and precipitation methods, are generally more complicated and time-consuming, based on the cation exchange separation - solution dry slag spectrometry method. Only on the basis of previous work has been improved: (1) Spectrometry, the choice of sodium as the external matrix, without the protection of the atmosphere device; (2) chemical separation, the resin layer height of 5.5 cm cation exchange column. Its characteristics are: faster separation, the sample allows a higher content of other impurities, the applicability of a wide range. Sampling 5 grams of uranium, gadolinium, dysprosium, samarium, europium determination limit reached 0.01ppm, to meet the UF_6 product specifications.