摘要：

研究了利用直接电导检测-离子色谱法分离测定电厂水汽中Na⁺、NH⁴⁺、K⁺、Ca²⁺、Mg⁺5种阳离子的方法。选择色谱条件为Ion Pac CS12A阳离子交换柱,20 mmol/L甲基磺酸淋洗液,抑制性电导检测。该方法采用500μL进样,5种阳离子的检出限为0.03～0.13μg/L,相对标准偏差(RSD,n=5)在0.24%～2.5%之间,加标回收率为96%～110%,该方法具有选择性好、检出限低、灵敏度高、操作简便等特点,可用于电厂给水、凝结水、蒸汽等水样中阳离子的测定。

关键词: 离子色谱, 电厂, 锅炉水, 阳离子

Abstract:

The method by using direct conductivity detection-ion chromatography process for separating and determining five kinds of cations：Na⁺,NH⁴⁺,K⁺,Ca²⁺,Mg²⁺ has been studied. The chromatographic condtions are Ion Pac CS12A cationic exchange column,20 mmol/L methanesulfonic acid leacheate and inhibiting electric-conductance detection. The sample used is 500 μL. Detection limit of the 5 kinds of cations is 0.03-0.13 μg/L,and relative standard deviations(RSD,n=5) 0.24%-2.5%,and the standard recoveries 96%-110%. This method is characterized by good selectivity,low detection limit,high sensitivity,easy operation,etc. It can be used for determining cations in samples,such as water supply in power plants,condensed water,steam,etc.

Key words: ion chromatography, power plant, boiler water, cations

中图分类号: 

• TM621.8