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用两支电极同时测定互为干扰的两种离子,借助计算机求解,藤永太一郎及科鲁普斯基等已发表了文章,本文以钾、钠离子为例,导出了以离子选择性电极同时测定互为干扰的两种离子的计算机求解的方程式并拟定了计算程序。实验结果表明,在电极的Nernst响应范围内,钾钠离子以任意含量比相混合时,互不干扰测定;实际水样的测定结果亦令人满意。 (一)方程式推导与计算机程序设计当试液中存在两种离子i,j(例如K~+与Na~+)互相干扰测定时,并考虑到选择性系数K_(ij)对干扰离子浓度及测定条件的依赖关系,则可将Nernst公式表示为:
Two kinds of electrodes are used to simultaneously determine two kinds of ions which interfere with each other. With the help of computer, published articles by Taiji Fujiru and Corupski et al. In this paper, taking potassium and sodium as examples, Interference with the two ions of the computer to solve the equation and to develop a calculation program. The experimental results show that in the Nernst response range of the electrode, the potassium-sodium ions are mixed with each other at any content ratio without interfering with each other. The actual water sample is also satisfactory. (1) Derivation of equations and computer program design When two kinds of ions i, j (for example, K ~ + and Na ~ +) interfere with each other in the test solution and take into account the influence of the selectivity coefficient K ij on the interference ion concentration and Determine the dependence of the conditions, you can Nernst formula is expressed as: