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根据Tb~(3+)在KIO_4-KOH体系中的光氧化反应,建立了钇族混合稀土中Tb的分光光度分析方法。在高压汞灯366nm的光辐照下,从无色的Tb~(3+)氧化为红棕色的Tb~(4+),其吸收谱带的峰值在420nm,其他三价钇族稀土无此反应,故无干扰。在Tb的分析浓度范围为1×10~(-5)M-1×10~(-3)M时,符合Beer定律,Tb在钇族混合稀土中含量的分析最低限为0.2％。此方法可以用于萃取钇族稀土过程中Tb的分析,方法简便、快速。
According to the photooxidation reaction of Tb ~ (3+) in KIO_4-KOH system, a spectrophotometric method for the determination of Tb in yttrium-mixed rare earths was established. Under the irradiation of 366nm high pressure mercury lamp, the peak of the absorption band of Tb ~ (4+) oxidized from colorless Tb ~ (3+) to reddish brown was 420nm. Reaction, so no interference. Beer’s law is obeyed when the analysis concentration of Tb is in the range of 1 × 10 -5 M -1 × 10 -3 M, and the lowest analysis limit of Tb content in the yttrium-containing mixed rare earth is 0.2%. This method can be used for the analysis of Tb in the extraction of rare earth yttrium. The method is simple and rapid.