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Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

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Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
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Controlled-Current Coulometry: Overview01:27

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

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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.
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The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
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Coulometric calcium pump for thin layer sample titrations.

Majid Ghahraman Afshar1, Gastón A Crespo1, Eric Bakker1

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.

Analytical Chemistry
|September 9, 2015
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Summary
This summary is machine-generated.

A novel electrochemical calcium pump enables precise calcium ion control. This technology facilitates accurate titrations in thin-layer solutions, offering potential for both lab and in-situ environmental or diagnostic applications.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Developing selective and efficient methods for ion manipulation is crucial in analytical chemistry.
  • Electrochemical pumps offer precise control over ion flux.
  • Thin-layer reservoirs enable rapid concentration changes for sensitive detection.

Purpose of the Study:

  • To report a selective electrochemical calcium pump utilizing a fast diffusive calcium ionophore-based membrane.
  • To demonstrate the pump's ability to control calcium flux for titration applications.
  • To evaluate the performance of the pump in complexometric titrations.

Main Methods:

  • Fabrication of a calcium ionophore-based membrane.
  • Application of a potential step function to induce calcium flux.
  • Monitoring ion perturbation using potentiometric and coulometric readouts.
  • Performing complexometric titrations with EDTA in a thin-layer reservoir.

Main Results:

  • A linear correlation was confirmed between released and detected calcium across both readout modes.
  • Potentiometric readout achieved 3% precision for 0.25-0.75 mM titrations.
  • Coulometric readout achieved 2% precision for 0.02-0.12 mM titrations.
  • Demonstrated efficient calcium pumping in background electrolyte solutions.

Conclusions:

  • The developed electrochemical calcium pump provides precise control over calcium flux.
  • Coupling the pump with a thin-layer element enables rapid sample concentration changes.
  • This platform shows promise for laboratory and in-situ titrations in environmental and diagnostic settings.