光纤激光荧光法测定硝酸体系中微量铀

LASER-INDUCED OPTICAL FIBER FLUORIMETRY FOR DETERMINATION OF TRACE URANIUM IN NITRIC ACID SOLUTION

摘要: <正> 一、引言微量铀的测量方法已有大量报道,但绝大部分的方法,一般需经化学分离,因此不适用于远距离的在线分析。近年来,随着光纤传感器的出现及激光荧光技术的发展,远距离在线分析Purex流程中铀和钚的方法引起了人们的兴趣。J.R mer等报道了以染料激光器为光源的光纤分光光度法,用以测定Purex流程中U(Ⅳ),U(Ⅵ),Pu(Ⅲ),Pu(Ⅳ)及Pu(Ⅲ)/Pu(Ⅳ)的混合物。R.A.Malstrom等研究了用416nm激光为激发光源的光纤荧光光度计,并讨论了用于Savannah河后处理厂铀的在线分析问题。为探索一种比较经济、简单,又能实现铀的远距离在线分析的测量方法,我们研制了一种以小型脉冲氮分子激光器为激发光源的光纤激光荧光法。我们考虑到Purex流程的实际情况,还研究了硝酸体系中各种因素对铀的荧光强度测量的影响。

Abstract: A laser-induced optical fiber fluorimetry is reported for the determination of trace uranium in nitric acid solution. A compact pulsed nitrogen laser (λ = 337nm) is used to excite the fluorescence of uranyl ions. Effects of temperature, concentrations of nitric acid and uranium, as well as the interference ions on the fluorescence intensity are studied. The fluorescence intensity is linear with respect to the concentration of uranium. The detection limits is 10ppm.