高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (4): 447.

• 论文 • 上一篇    下一篇

浓度同倍数递减离子选择电极标准加入法

罗登柏   

  1. 中南民族学院化学系, 武汉, 430074
  • 收稿日期:1990-03-07 出版日期:1992-04-24 发布日期:1992-04-24

A New Standard Addition Method of ISEs Using Sample and Standard Series with Concentrations Decreased at Identical Rates

LUO Deng-bai   

  1. Department of Chemistry, South-Central College for Nationalities, Wuhan, 430074
  • Received:1990-03-07 Online:1992-04-24 Published:1992-04-24

摘要: 本文报道了试液和标液浓度同倍数递减标准加入法。该法可测定几个体积均为Vx而浓度以Cx/N方式递减的试液(1≤N≤2),每个试液加等体积标液1次,在半对数算图上,各试液加入标液后的电位对原始试液电位差ΔEN与浓度递减倍数N之间有线性关系,由交点N0解Cx=CsVs/[(N0-1)Vx+N0Vs]方程求得分析结果。该法不必测定电极的能斯特斜率。

关键词: 离子选择电极, 标准加入法, 浓度同倍数递减

Abstract: In this paper a new standard addition method is proposed, in which sample solutions with the same volumes Vx and different concentrations Cx/N(in general, 1≤N≤2) are separately titrated with the standard solution .The volume and concentration of the standard solution added to each sample are Vs and Cs/N, where Nis the same as that of the titrated sample solution.Based on this procedure semilogarithmic linear plots of △EN vs.Nwere obtained, where △EN is the difference between potential after addition and potential of the original sample, Nis the decreased times of concentrations of correlative sample and the standard solution.The con-centration Cx of the analyte is determined from the intersection, N0, by the equation:Cx=CsVs[(N0-1)Vx+N0Vs].

Key words: Ion-selective electrode, Standard addition method, Concentrations of sample and standard series decreased at identical rates

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