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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...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
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

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
09:36

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

Published on: September 12, 2018

Liquid state membrane electrode sensitive to Ln(III).

W Szczepaniak1, M Ren

  • 1Department of Instrumental Analysis, Faculty of Chemistry, A. Mickiewicz University, Poznań, Poland.

Talanta
|August 1, 1994
PubMed
Summary

A new liquid ion-exchange electrode selectively detects lanthanide ions (Ln(III)). This electrode shows excellent performance and can determine the endpoint in titrations involving Ln(3+) ions.

Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Inorganic Chemistry

Background:

  • Lanthanide ion (Ln(III)) detection is crucial in various scientific fields.
  • Developing selective and sensitive electrodes for Ln(III) determination remains a challenge.

Purpose of the Study:

  • To describe a novel liquid ion-exchange electrode for Ln(III) detection.
  • To evaluate the electrode's performance, including its selectivity and applicability in titrations.

Main Methods:

  • Fabrication of a liquid ion-exchange electrode using a chloroform solution of the complex of Ln(III) with tetraphenyl ester of imidodiphosphoric acid.
  • Electrochemical measurements to determine the calibration graph slope and assess interference from other ions.
  • Application of the electrode in detecting the endpoint of Ln(3+) titrations.

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Main Results:

  • The electrode exhibited a calibration graph slope of 18.5 mV/pLn in the pLn range of 4.7-2 at pH 5.
  • The electrode demonstrated selectivity for Ln(III) ions, with no interference observed from Fe(III), Al(III), Co(II), Ni(II), and Ca(II) ions.
  • The electrode successfully detected the endpoint of Ln(3+) ion titrations.

Conclusions:

  • A novel liquid ion-exchange electrode based on a specific complex has been developed for Ln(III) detection.
  • The electrode offers good sensitivity and selectivity, making it suitable for analytical applications.
  • This electrode provides a reliable method for determining Ln(3+) ions, particularly in titration analyses.