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本文论证了直接电位法与电位滴定法相结合的分析方法——单点滴定法,是一种既简便快速、又准确的分析方法。对络合单点滴定法的原理、方法及其优缺点进行了详细讨论,从理论上推导出络合单点滴定法准确度高的本质及其高精密度的来源,指出最佳滴定度与离子选择电极检测下限有关,并通过实验验证了其主要论点。用钙离子选择电极指示,EDTA滴定CaCl_2溶液,1小时内进行16次测定,最大相对误差小于0.2％。
This article demonstrates the combination of direct potentiometry with potentiometric titration, a single-point titration, as a simple, rapid and accurate analytical method. The principle, method and the advantages and disadvantages of the complex single-point titration method are discussed in detail. The high accuracy of the complexed single-point titration method and the source of its high precision are deduced theoretically, and the optimal titration and ion selection The lower limit of electrode detection, and its main argument verified by experiments. Calcium ion selective electrode, EDTA titration CaCl 2 solution, within 1 hour for 16 measurements, the maximum relative error of less than 0.2%.