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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...

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Related Experiment Video

Updated: Jun 28, 2026

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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The hydrogen-ion selective glass electrode.

G Johansson1, B Karlberg, A Wikby

  • 1Department of Analytical Chemistry, University of Umeå, S-901 87 Umeå, Sweden.

Talanta
|December 1, 1975
PubMed
Summary

This study reviews hydrogen-ion selective glass electrodes, presenting a model of their operation. A method to cancel asymmetry potential is detailed, enhancing precision measurements.

Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Hydrogen-ion selective glass electrodes are crucial for pH measurement.
  • Understanding their operational mechanism and properties is essential for accurate electrochemical sensing.

Purpose of the Study:

  • To review the properties and mechanism of hydrogen-ion selective glass electrodes.
  • To present a model based on recent research.
  • To discuss methods for improving electrode performance, such as reducing asymmetry potential.

Main Methods:

  • Review of existing literature and recent research findings.
  • Development of a model for the gel layer and transition layer of pH-glass electrodes.
  • Discussion of experimental procedures for creating symmetric layers to minimize asymmetry potential.

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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

Main Results:

  • Detailed description of the gel layer composition and its role in ion binding.
  • Identification of the transition layer's high resistivity as a barrier to ion transport and corrosion.
  • Demonstration that symmetric layer formation can significantly reduce asymmetry potential.

Conclusions:

  • The presented model provides insights into the complex behavior of glass electrode surfaces.
  • Minimizing asymmetry potential through controlled hydration offers a pathway to enhanced measurement precision.
  • The findings have implications for applications in precision measurements and non-aqueous solvent analysis.