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偶氮氯膦-mA(CPA-mA)光度比色法测定稀土已见报导,本文为简化分析手续作了一些改进。在草酸-磷酸-偶氮氯膦-mA的混合体系掩蔽显色下,测定稀土总量,方法简便,准确性良好。一试剂混合显色剂:称取偶氮氯膦-mA0.07克溶解于200毫升水中,加入草酸40克、磷酸8毫升,用水稀至1升,摇匀。二分析方法称取试样0.01克于50毫升锥形瓶中,加入硝酸溶液(1+3)1毫升,过硫酸铵(固体)0.1克,加热并过氧化氢(30%)逐滴逐滴地加入,试样分解后,冷却,加入混合显色剂10毫升,摇匀。在72型分光光度计上,
Rare earths have been reported for the determination of rare earths by chlorophosphonazo-mA (CPA-mA) spectrophotometry. In this paper, some improvements have been made to simplify the analysis procedure. In oxalic acid - phosphoric acid - chlorophosphonazo-mA mixed system masking color, the determination of the total amount of rare earth, the method is simple and accurate. A reagent mixed developer: Weigh the chlorophosphonazo-mA0.07 grams dissolved in 200 ml of water, add oxalic acid 40 grams, 8 ml of phosphoric acid, diluted with water to 1 liter, shake. Two analytical methods Weigh 0.01 g sample in a 50 ml Erlenmeyer flask, add 1 ml of nitric acid solution (1 + 3), 0.1 g of ammonium persulfate (solid), heat and hydrogen peroxide (30%) dropwise To join, the sample decomposition, cooling, adding mixed color reagent 10 ml, shake. On the 72 spectrophotometer,