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萃取色层法是将溶剂萃取和色层分离相结合的新型分离方法,它兼有溶剂萃取和色层分离两种分离方法的优点,现已广泛应用到微量铀的分离测定中。通常采用的萃取剂有TBP、P350、P204、N263、TOPO等。其中P350是我国自己合成的萃取剂,它具有萃取能力强、分配系数大、选择性好等优点。本文应用P350-聚三氟氯乙烯萃取色层柱分离干扰元素,以5-Br-PADAP-磺基水杨酸-溴化十六烷基吡啶(CPB)为显色剂,分光光度法测定矿石中微量铀。经实践证明,该法简单快速,灵敏度较高,选择性较好,适用于矿石中微量铀的测定。
Extraction chromatography is a new separation method combining solvent extraction and chromatography. It combines the advantages of solvent extraction and chromatographic separation. It has been widely applied to the separation and determination of trace uranium. Commonly used extractants are TBP, P350, P204, N263, TOPO and so on. Which P350 is China’s own synthetic extractant, which has strong extraction capacity, distribution coefficient, good selectivity and so on. In this paper, P350-polychlorotrifluoroethylene extraction chromatography column separation of interfering elements, with 5-Br-PADAP-sulfosalicylic acid - cetyl pyridinium bromide (CPB) as a reagent, spectrophotometric determination of ore Trace uranium. The practice proved that the method is simple and rapid, high sensitivity and good selectivity, suitable for the determination of trace uranium in ores.