离子电极标准添加法及其Gran作图法的改进研究工作,近年来都基于电极电位(E)的测量和电极斜率(S)的校正。由于E测量的误差和S的变化,使精度的提高受到很大限制。本文提出一种以标准添加体积作直线图的“等电势标准添加法”,这种直线图既不需要离子电极的电位,也不需要响应斜率,方法的精度尚优于Gran作图法。 In recent years, both the standard addition method of ion electrodes and the improvement research of its Granography have been based on the measurement of the electrode potential (E) and the correction of the electrode slope (S). Due to the error of E measurement and the change of S, the improvement of accuracy is greatly limited. This paper proposes a “standard addition method of equipotential” using a standard volume as a straight line, which does not require the potential of the ion electrode or responds to the slope. The accuracy of the method is superior to that of the Gran graph.