试样加入法在离子选择电极测定中的应用

THE APPLICATION OF ANALYTE ADDITION METHOD IN ION SELECTIVE ELECTRODES ANALYSIS

本文对经典的离子选择电极标准加入法进行了改进，在标准溶液加入的同时，试样溶液也被加入，测得的电位响应值用非线性迭代法处理，可同时求得样品溶液的浓度Ｃ＿ｘ，标准电极电位Ｅ￣０１和电报斜率Ｓ．以这种方法对铅、银、镉、碘和氯离子溶液进行了测试，获得了较好的结果。本工作还对自来水中的氯及海带中的碘进行了实际测定，证明了此法的可行性。

In this paper,a new method for ion-selective electrode analysis was developed.Itwas carried out with the simultaneous additions of standard and analyte sample. Themeasured potential of each addition was;processed with nonlinear iterative method,and theconditional standard prtential of electrode system,E￣01,the slope of the indicater electrode,S,and the concentration of the unknown,C_x,were obtained at the same time. This methodwas tested by applying to the determination of chloride,iodine,cadmium,silver and leadions and the results(relative standard deviation)were in the range of(2～4.5)%.