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  

Determination of Alkali and Alkaline Earth Metal Ions for Water Containing Boric Acid in Nuclear Power Plant by Ion Chromatography

作　　者：林清湖 徐天凤 LIN Qing-hu XU Tian-feng(Hainan Nuclear Power Limited Company, Changjiang 570133, China)

机构地区：[1]海南核电有限公司,海南昌江570133

出　　处：《原子能科学技术》2017年第1期8-12,共5页Atomic Energy Science and Technology

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。Metal ions of the water containing boric acid are usually detected by atomic absorption spectroscopy and inductively coupled plasma optical emission spectrometer in nuclear power plants.Under the existence of the boric acid in water,the metal ion recovery rate and accuracy are significantly affected by boric acid with the method of atomic absorption spectroscopy.The limit of detection of inductively coupled plasma optical emission spectrometer is not enough to meet the need of trace metal ions in nuclear power plants.In this study,using the selective permeability of ion exchange membranes of suppressor to remove boric acid online,the metal ions were accurately determined by ion chromatography.The recovery rates of standard addition,relative standard deviations and method detection limits of Li＋,Na＋,K＋,Mg^（2＋）and Ca^（2＋）are97.0%-102.3%,0.54%-1.25%（n=7）and 2.58-40.38 ng/L respectively,whichdemonstrates that this method can be applied in the analysis of Li＋,Na＋,K＋,Mg^（2＋）and Ca^（2＋）concentrations in nuclear power plants.This method has the advantage of easy operation,reliability,fast speed and low detection limits.

关 键 词：含硼酸水 离子色谱 痕量金属离子 

分 类 号：O652.2[理学—分析化学]