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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...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential ensures...
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

Measurement of Extracellular Ion Fluxes Using the Ion-selective Self-referencing Microelectrode Technique
09:18

Measurement of Extracellular Ion Fluxes Using the Ion-selective Self-referencing Microelectrode Technique

Published on: May 3, 2015

Experience with mixed-salt ion-selective sulphate electrodes.

K Nagy1, T A Fjeldly

  • 1Division of Applied Chemistry, SINTEF, and Electronics Research Laboratory, The Technical University of Norway, N-7034 Trondheim-NTH, Norway.

Talanta
|September 1, 1979
PubMed
Summary

Researchers developed sulphate ion-selective electrodes using mixed-salt membranes. Only specific membrane compositions showed acceptable performance, with cuprous sulphide additions having no significant impact on results.

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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Ion-selective electrodes (ISEs) are crucial for chemical analysis.
  • Sulphate (SO4^2-) determination requires reliable and selective sensing methods.

Purpose of the Study:

  • To develop and evaluate sulphate ion-selective electrodes (ISEs) using mixed-salt, pressed-pellet membranes.
  • To assess the performance, stability, and selectivity of these novel ISEs.

Main Methods:

  • Fabrication of mixed-salt membranes for ISEs.
  • Testing of electrode response, stability, and selectivity.
  • Evaluation of the effect of cuprous sulphide additives.

Main Results:

  • Acceptable performance for sulphate ISEs was achieved only with specific membrane compositions.
  • Electrode stability and selectivity varied significantly among tested specimens.
  • Incorporating small amounts of cuprous sulphide into the membrane did not substantially alter performance.

Conclusions:

  • The development of effective sulphate ISEs is highly dependent on precise membrane formulation.
  • Further optimization is needed to ensure consistent and reliable performance of these electrodes.
  • Cuprous sulphide is not a beneficial additive for improving the performance of these specific sulphate ISEs.