萃取色谱分离偶氮氯膦-mN光度法测定矿石中铈

Spectrophotometric Determination of Cerium in Minerals and Rocks with Chlorophosphonazo-mN by the Separation of Extraction Chromatography

本文提出以P为固定相,盐酸为流动相的萃取色谱法把铈从溶液中分离出来,以偶氮氯膦-mN与铈的高灵敏显色反应进行比色。本法灵敏度ε=7.8×10^(4)。实验部分色谱柱:φ8×120m/m硅烷化硅球100—120目(上试一厂出品)P(上海有机化学所实验工厂)偶氮氯膦-mN0.05%水溶液杂质洗除液:5%NHCl,2%磺基水杨酸,1%抗坏血酸,调至ρH2—3铈、镧、镨标准液:用光谱纯的氧化铈,氧化镧.

A new column extraction chromatographic method with p507 as stationary phase,silicon-treated porous silica-gel bead as carrier and dilute hydrochloric acid as a mobile phase is suggested for the separation of cerium from minerals and rocks.By using oxalic acid,sodium pyrophosphate and phosphoric acid as masking agents,for other elements cerium were determined with chlorophos-phonazo-mN.More than twenty kinds of foreign ions of 5 mg do not interfere in the determination.