1BX制备过程中U(Ⅳ)和U(Ⅵ)的同时快速分析

Simultaneous Determination of Concentrations of U(Ⅳ) and U(Ⅵ) by Vis Spectroscopy-PLS During the Preparation of 1BX Flow

摘要: 将U(Ⅳ)、U(Ⅵ)可见吸收光谱与偏最小二乘法(PLS)相结合，利用自主研制的多通道光纤光谱仪及分析软件，建立了1BX制备过程中U(Ⅳ)、U(Ⅵ)的同时、快速测定方法。研究结果表明：建立的U(Ⅳ)、U(Ⅵ)定量校正模型具有较高的准确性，U(Ⅳ)测定范围为1.00～180.21g/L，U(Ⅵ)测定范围为11.00～200.00g/L，对于U(Ⅳ)、U(Ⅵ)样品测量相对偏差分别小于7%和8%，U(Ⅳ)重加回收率为99.4%～100.8%，U(Ⅵ)重加回收率为96.4%～104.6%。方法简单、快速、无需预处理、可同时进行多组分测量，为该工艺过程的在线分析或流线分析提供基础。

Abstract: Vis-PLS was used to determine U(Ⅳ) and U(Ⅵ) simultaneously during the preparation of 1BX flow. A self-designed multi-channel fiber-optic spectrometer and analysis software were used in this study. The results show that U(Ⅳ) and U(Ⅵ) can be determined accurately by the calibration model. Measuring range for U(Ⅳ) is 1.00-180.21 g/L，for U(Ⅵ) is 11.00-200.00 g/L. The relative bias of U(Ⅳ) is less than 7%, and the recovery is between 99.4% and 100.8%. The relative bias of U(Ⅵ) is less than 8%, and the recovery is between 96.4% and 104.6%. Samples without any pretreatment can be determined fast and simply by this method, even for those consisted of many kinds of ingredients. It provides a useful foundation for on line or flow line analysis during this procedure.