The implementation of a new calibration approach, termed the Signal Increment Standard Addition Method (SI-SAM), to the potentiometric determination of potassium in the synthetic samples and certified reference materials, is investigated. SI-SAM is a modification of SAM that is based on the change in the way in which the extrapolation is carried out. The calibration graph is extrapolated to the intersection with the signal of the first standard solution, not to the abscissa. Potentiometry is the method of choice due to its simplicity, rapid measurements, wide linear range and fulfilment of green analytical principles. However, careful attention is required to the calibration procedure because various versions of the standard addition method, which are commonly used in potentiometry, may create some problems leading to serious systematic analytical errors. The present work proves that SI-SAM allows for the elimination of this drawback and, consequently, for the determination of the considered analyte with improved results, especially in terms of accuracy and precision.

Graphic abstract

中文翻译：

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在电位测量中使用新的校准方法测定钾

研究了一种新的校准方法的实施，该方法被称为信号增量标准添加方法（SI-SAM），用于电位滴定法测定合成样品和认证参考材料中的钾。SI-SAM是对SAM的修改，它基于外推方法的变化。将校准图外推到与第一个标准溶液的信号的交点，而不是横坐标。电位计是一种选择方法，因为它具有简便，快速测量，线性范围宽和符合绿色分析原理的特点。但是，由于在电位计中常用的标准加法的各种版本，可能会产生一些问题，导致严重的系统分析错误。当前的工作证明，SI-SAM可以消除这一缺陷，从而可以更好地确定所考虑的分析物，尤其是在准确性和精密度方面。

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