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比较研究了测定纯铌中微量钽的5 Br PADAP,水杨基荧光酮及丁基罗丹明B三种分光光度法。试验结果表明,采用纸色层分离可提高方法的选择性,5 Br PADAP法适于测定钽量为0.005—0.10％;水杨基荧光酮法适于测定钽量为0.001—0.010％,是水相中测定铌中微量钽灵敏度较高、比较理想值得推荐的方法;丁基罗丹明B法可测定钽量为0.0005—0.010％,摩尔吸光系数可达1.39×10~5。
A comparative study of 5 Br PADAP, salicylfluorone and butyl rhodamine B for the determination of trace tantalum in pure niobium has been performed. The test results show that the paper color layer separation can improve the selectivity of the method, 5 Br PADAP method is suitable for the determination of tantalum 0.005-0.10%; salicyl fluorone method is suitable for the determination of tantalum 0.001-0.010%, is water The determination of trace niobium in tantalum has a higher sensitivity and is recommended for the determination of tantalum in the phase. Butyl rhodamine B can determine the amount of tantalum 0.0005-0.010% and the molar extinction coefficient up to 1.39 × 10-5.