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用乙二醇丁醚作为互溶剂,使一定量的TBP-煤油和水形成均一相。在0.1N HNO_3体系中钍与羧基偶氮胂(偶氮胂-K)形成络合物,于波长672毫微米处呈最大吸收,其克分子消光系数为4.27×10~4。钍含量在1—10微克/5毫升范围内,服从比尔定律。精密度小于3%。在此体系中可允许较多量的铀存在,但随着铀量的增加误差增大。当U∶Th≤7∶1时,误差小于5%。本法简便、快速、灵敏度较高。主要优点是能直接互溶测定TBP-煤油中的钍,为流线分析提供了方法。
With ethylene glycol butyl ether as a mutual solvent, a certain amount of TBP-kerosene and water form a homogeneous phase. In the 0.1N HNO3 system, thorium forms a complex with arsenazo (arsenazo-K), which absorbs at a wavelength of 672 nm and has a molar extinction coefficient of 4.27x10-4. Thorium content in the range of 1-10 micrograms / 5 ml, subject to Bill’s law. Precision less than 3%. In this system can allow a larger amount of uranium, but as the amount of uranium increases the error increases. When U: Th ≤ 7: 1, the error is less than 5%. This method is simple, fast and sensitive. The main advantage is that the direct determination of thorium in TBP-kerosene can be used to provide a method for streamline analysis.