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光度法测定镧铈含量的方法已有不少研究,但适宜于在15个稀土元素存在下测定镧铈合量的方法尚未见报导。本文拟定了以武大化学系新研制成的对乙酰基偶氮胂为显色剂测定镧铈含量约70%以上的稀土混合物中镧铈含量的实验方法及条件。试剂与稀土元素形成蓝绿色络合物,在pH=3.1～3.2的盐酸-醋酸钠介质中,加入适量EDTA-Zn为掩蔽剂,当镧铈含量为15～25微克/25毫升时,用2.5～3.0毫升0.1%对乙酰基偶氮胂水溶液显色,可使镧、铈发色,而铈以后的十三个稀土元素基本不显色,从而实现镧铈富集物中镧铈合量的测定。方法简便、快速,不经分离可
There are many studies on the method for the determination of lanthanum-cerium content by photometry, but there is no report about the method suitable for the determination of lanthanum-cerium content in the presence of 15 rare earth elements. In this paper, an experimental method and conditions for the determination of lanthanum-cerium content in a rare earth mixture with a lanthanum-cerium content of over 70% using acetoarsenazo as a chromogenic reagent newly developed by the Department of Chemistry, Wu Da University were developed. Reagents and rare earth elements to form a blue-green complex in the pH = 3.1 ~ 3.2 hydrochloric acid - sodium acetate medium, adding an appropriate amount of EDTA-Zn masking agent, when the lanthanum cerium content of 15 to 25 micrograms / 25 ml 2.5 ~ 3.0 ml of 0.1% acetylazoazo arsenic aqueous solution color, lanthanum, cerium color, and after the thirteen rare earth cerium basic color, in order to achieve lanthanum cerium enrichment of lanthanum cerium in the amount of Determination. Method is simple, fast, without separation