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基于Debye-Hückel极限公式提出一种利用电极直接测定已知电解质构成的溶液中的离子浓度的迭代运算方法,并分别运用钙离子电极和钠离子电极进行了实验.结果表明,利用电极的活度测定结果,经迭代运算而得到的浓度与离子真实浓度能够很好地吻合.该研究中,在很宽的浓度范围内,用钠离子电极测定Na+浓度所得结果的相对误差平均为5.6%,用钙离子电极测定Ca2+浓度所得结果的的相对误差平均为3.8%.迭代运算本身是严格成立的,误差来源于电极对活度的测量.运用电极直接测定离子浓度的迭代运算法不但克服了传统方法中的各种弊端,而且结果中的误差也更低,是一种非常理想的方法.并且,通过对离子计的内部输入迭代运算程序,就可以实现离子计对离子浓度的直接测定.在离子吸附与解吸等领域的研究中,由于其电解质构成已知,所以本法的应用将独具优势.
Based on the Debye-Hückel limit formula, an iterative method for directly determining the ion concentration in a solution of a known electrolyte using an electrode was proposed, and the experiments were carried out using calcium ion electrode and sodium ion electrode respectively. The results show that using the electrode activity The results obtained by iterative calculations are in good agreement with the true ion concentration.The relative error of the results obtained using Na + electrode over a wide range of concentrations in this study was 5.6% The average relative error of the results obtained by calcium ion electrode is 3.8% .The iterative calculation itself is strictly established, and the error comes from the measurement of the electrode activity.The iterative method using the electrode to directly measure the ion concentration not only overcomes the traditional method In the various drawbacks, and the results of the error is lower, is a very ideal method and, through the internal input of the ion meter iterative computing program, you can achieve a direct ion meter ion concentration measured in the ion Adsorption and desorption and other fields of research, due to its known electrolyte composition, so the application of this law will have unique advantages.