铀络合物的时间分辨荧光光谱特性及其应用研究

Time Resolved Fluorescence Spectroscopy of Uranium Complex and Its Application

在紫外脉冲荧光激发下,某铀络合物能发射特征荧光。该铀络合物的荧光特性因体系性质改变而发生改变。利用这些改变,开发出相应的分析方法,用于铀及其他离子的测定。研究表明,pH是影响铀络合物荧光强度的关键要素之一,在pH 6.85~9.10范围内,铀络合物荧光强度稳定。利用此特性,测定了富锆天然伴生放射性样品中的铀含量,其检出限0.05μg·g^(-1),测定范围0.15~4 500μg·g^(-1);铀含量在40~735μg·g^(-1)范围内,精密度为2.1%~7.7%;对铀含量为288μg·g^(-1)的富锆样品,正确度为5.2%。此外,Cr和Sn等离子对铀络合物荧光强度有显著影响,利用这种影响,有望开发出若干测定方法。

Under the excitation of ultraviolet pulse fluorescence,a uranium complex can emit characteristic fluorescence.The fluorescence characteristics of the uranium complex change due to the change of system properties.With these changes,corresponding analytical methods have been developed for the determination of uranium and other ions.The study shows that pH is one of the key factors that affect the fluorescence intensity of uranium complex.In the range of pH 6.85 to 9.10,the fluorescence intensity of uranium complex is stable.Using this characteristic,the content of uranium in naturally occurring radioactive material samples was determined.The detection limit of 0.05 mg·kg-1,the range of determination of 0.15 to 4500 mg·kg-1,the precision of 2.1%to 7.7%for the content of uranium range 40735 mg·kg-1 and the trueness of 5.2%for zirconium-rich sample with the content of 288 mg·kg-1 are validated.In addition,Cr and Sn ions have significant influence on the fluorescence intensity of uranium complex,and some determination methods are expected to be developed by this effect.