微波消解-原子吸收法应用于核级树脂锂型转型率的分析研究

Application of Microwave Digestion-Atomic Absorption Spectroscopy in Analysis of Lithium Conversion Rate in Nuclear Class Resin

常规核级离子交换树脂锂型转型率的测量采用将离子交换树脂中的锂用酸淋洗后测量锂浓度,再计算锂型转型率,存在分析时间长、分析结果偏低等不足。本文采用微波消解-原子吸收法测量核级离子交换树脂的锂型转型率,利用微波消解实现树脂的完全消解,利用原子吸收仪测量锂浓度,结合氢型树脂湿基工作交换容量计算离子交换树脂的锂型转型率,实现离子交换树脂锂型转型率的准确测量。分析结果表明,锂浓度加标回收率为99%,相对标准偏差为0.97%(n=7),锂型转型率达99.20%。方法具有离子交换树脂使用量少、分析结果准确等优点,可用于核级离子交换树脂锂型转型率的测量。

Conventionally, the lithium conversion rate of nuclear class resins was measured by measuring the lithium concentration after eluting lithium from the ion exchange resin with acid, which is with the problems of long analysis time and lowered analysis results. In this study, the microwave digestion-atomic absorption spectroscopy was applied in the measuring of lithium conversion rate of nuclear class ion exchange resin. The nuclear class ion exchange resin was completely digested by microwave. The lithium conversation was measured by atomic absorption spectroscopy. The lithium conversion rate was calculated, combined with the working exchange capacity of the hydrogen type ion exchange resin. Under the optimized conditions, the recovery of standard addition, relative standard deviations and the lithium conversion rate were 99%, 0.97%(n=7) and 99.20%, respectively. The system has the advantage of less usage of ion exchange resin and accurate analysis result, which demonstrate that the present system can be applied in the measuring of lithium conversion rate of nuclear class ion exchange resin.