全反射X射线荧光光谱法测定核废水中的铀和钍

Uranium and Thorium Determination in Nuclear Wastewater by Total Reflection X-Ray Fluorescence Spectrometry

建立了直接制样-全反射X射线荧光光谱法(TXRF)测定核废水中U、Th元素。以Ga做内标,方法的检出限分别为0.010、0.008 mg/L,标准溶液测量结果相对标准偏差小于7%(n=6),加标回收率在95%~115%之间。通过TXRF法与电感耦合等离子体质谱法(ICP-MS)对未知样品的测量结果比较,两种方法测量结果一致,U和Th的线性回归方程的斜率分别约为0.93、1.0,线性相关系数分别为0.997、0.999。

A method for the determination of uranium and thorium in nuclear wastewater by total reflection X-ray fluorescence spectrometry(TXRF)with direct sample preparation was established.Ga was used as an internal standard,the detection limits for U,Th are 0.010,0.008 mg/L,and the relative standard deviation of the standard solution measurement is less than 7%(n=6),and the marked recovery is between 95% and 115%.The method has been applied to the determination of unknown samples,and the results are in good agreement with ICP-MS.The slope of equation of line regression about U and Th is 0.93 and 1.0 respectively.The correlation coefficient of equation about U and Th is 0.997 and 0.999 respectively.