Roles of Interfacial Functions in Analytical Chemistry. Theory of amperometric sodium and potassium ion-selective electrodes based on the ionophore-assisted transfer of ions across a polarized oil/water interface current response behavior at higher concentrations of analyte ion.

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Other Title
  • 界面機能と分析化学　　アンペロメトリー型Ｎａ｀＋´及びＫ｀＋´イオン選択性電極の電流‐電位特性とその高濃度領域定量分析への応用
  • アンペロメトリーカタ Na オヨビ K イオン センタクセイ デンキョク ノ
  • アンペロメトリー型Na^+及びK^+イオン選択性電極の電流-電位特性とその高濃度領域定量分析への応用

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Abstract

The theory of normal pulse voltammetry (NPV) and potential sweep voltammetry (PSV) of amperometric ion-selective electrodes (AISEs) based on the ionophore-assisted transfer of ions across a polarized organic solvent or oil/water (O/W) interface is discussed. A numerical solution of the resulting integral equations has been used to show how their voltamograms vary with the ratio of the concentration of the analyte ion in the W phase (test solution) to that of ionophore in the O phase (ion-sensitive membrane). The theoretical prediction agrees well with the experimental results obtained with amperometric K+- or Na+-ISEs. up to 20 or 200 mM, respectively, at 20 mM of ionophore. Generally, the current response of the AISEs at constant ionophore concentration is not linear with respect to the concentration of the analyte ion when the ratio of the concentrations exceeds 0.01. In order to realize a linear calibration curve in wide range of analyte concentration up to a few molar of, e.g, Na+ ion, a new technique, called F-pulse amperometry, is proposed; it has been experimentally verified by applying a pulse voltage corresponding to the 'foot of wave' potential and sampling the current response according to the NPV technique.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 47 (12), 919-927, 1998

    The Japan Society for Analytical Chemistry

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