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本文探讨了在甲酸介质中,稀土元素与偶氮硝羧的显色反应。选择EDTA(Na)作为抑制钇组稀土元素的络合剂,拟定了以PMBP萃取-甲酸反萃取稀土元素,连续测定稀土总量(偶氮胂Ⅲ光度法)和铈组稀土元素(偶氮硝羧光度法)的方法。本法比较准确,灵敏度高,选择性好。适用于独居石,磷钇矿,黑钨矿等不同类型矿石中0.01-1％铈族稀土元素(镧、铈、镨、钕等)的测定。实验部分 (一)仪器与主要试剂分光光度计(日本岛津QR50型)。铈组稀土元素标准溶液:根据三种类型稀土矿的光谱分析结果,配制了如下表所列的三种标准溶液。稀释每毫升相当于0.5毫克∑CeO_2的25％盐酸溶液,配制成每毫升相当于20微克∑CeO_2的25％盐酸
In this paper, the color reaction of rare earth elements with azobenzene carboxylate in formic acid was investigated. In this paper, EDTA (Na) was chosen as the complexing agent to inhibit the rare earth elements in the yttrium group. A series of rare earth elements were extracted by PMBP extraction - formic acid extraction and the total rare earth elements (arsenazo Ⅲ luminosity method) Carboxyometric method) method. This law is more accurate, high sensitivity, good selectivity. It is suitable for the determination of 0.01-1% cerium rare earth elements (lanthanum, cerium, praseodymium, neodymium, etc.) in different types of ores of monazite, xenotime and wolframite. Experimental part (a) instrument and the main reagent spectrophotometer (Shimadzu QR50 type). Cerium rare earth element standard solution: Based on the spectral analysis of the three types of rare earths, three standard solutions are prepared as listed in the following table. Dilute 25 ml of hydrochloric acid solution equivalent to 0.5 mg of ΣCeO 2 per ml to prepare 25% hydrochloric acid equivalent to 20 μg of ΣCeO 2 per ml