离子色谱法测定核电厂含硼酸水中的碱金属和碱土金属离子

发布时间：2018-04-04 05:17

本文选题：含硼酸水　切入点：离子色谱　出处：《原子能科学技术》2017年01期

【摘要】：核电厂含硼酸系统水质中金属离子含量的分析常采用原子吸收光谱法和电感耦合等离子体发射光谱法。在硼酸存在下,原子吸收光谱法分析金属离子时回收率和准确性明显偏低;电感耦合等离子体发射光谱法检测能力有限,无法满足痕量金属离子分析需求。本文采用离子色谱法,利用抑制器中离子交换膜的选择透过性在线去除硼酸,消除硼酸对金属离子测量的影响,实现金属离子的准确测量。结果表明,Li+、Na+、K+、Mg~(2+)、Ca~(2+)的测量加标回收率为97.0%~102.3%,相对标准偏差为0.54%~1.25%(n=7),方法检测限为2.58~40.38ng/L。该方法具有操作简单、稳定可靠、分析速度快、检测限低等优点。
[Abstract]:Atomic absorption spectrometry (AAS) and inductively coupled plasma emission spectrometry (ICP-AES) are often used to analyze the content of metal ions in water quality of nuclear power plant containing boric acid system.In the presence of boric acid, the recovery and accuracy of atomic absorption spectrometry in the determination of metal ions are obviously low, and the detection ability of inductively coupled plasma emission spectrometry (ICP-AES) is limited, which can not meet the requirement of trace metal ion analysis.In this paper, ion chromatography is used to remove boric acid online by using selective permeation of ion exchange membrane in the suppressor to eliminate the influence of boric acid on metal ion measurement and to realize the accurate measurement of metal ions.The results show that the standard addition recovery is 97.0 ~ 102.3, the relative standard deviation is 0.54 ~ 1.25% and the detection limit is 2.58 ~ 40.38 ng 路L ~ (-1).This method has the advantages of simple operation, stable and reliable, fast analysis speed and low detection limit.
【作者单位】：海南核电有限公司;
【分类号】：TM623;O657.7

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