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

  • 山田 正之
    福井県立大学生物資源学部生物資源学科
  • 片野 肇
    福井県立大学生物資源学部生物資源学科
  • 千田 貢
    福井県立大学生物資源学部生物資源学科

書誌事項

タイトル別名
  • 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.
  • 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

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抄録

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.

収録刊行物

  • 分析化学

    分析化学 47 (12), 919-927, 1998

    公益社団法人 日本分析化学会

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