离子选择电极连续测定天然水中钾钠含量

Determination of potassium and sodium in natural water by ion selective electrode

离子选择电极连续测定天然水中钾钠含量李运涛（西北轻工业学院化学工程系，陕西咸阳７１２０００；作者，男，３３岁，讲师）钾钠是天然水中的重要组分，实验室中通常采用重量法、火焰光度法及原子吸收法［１］等测定．而目前野外常用阴阳离子差减法计算水中钾钠的含量，...

This article not only introduces the method of using ion selective electrode to test successively K +,Na + in natural water, but also discusses the testing system, interference of other substanes. The experiment shows that when the density of other ions in natural water is less than 10 -4 mol/L, the linear scope of potassium electrode is 8×10 -6 mol/L～10 -1 mol/L,and the linear scope of the sodium electrode is 8×10 -5 mol/L～10 -1 mol/L. Its result is almost consistent with flame photometer, its relative error is generally smaller than 5%.