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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not...
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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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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.
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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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...
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Updated: Mar 28, 2026

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Additional considerations on electrolysis in electromembrane extraction.

Andrea Šlampová1, Pavel Kubáň1, Petr Boček1

  • 1Institute of Analytical Chemistry of the Czech Academy of Sciences, v. v. i., Veveří 97, CZ-60200 Brno, Czech Republic.

Journal of Chromatography. A
|December 29, 2015
PubMed
Summary

Optimized acceptor solutions stabilize electromembrane extraction (EME) performance by preventing pH changes. This method enhances drug recovery and prevents analyte back-extraction, improving overall EME efficiency.

Keywords:
Basic drugsElectrolysisElectromembrane extractionMicro-electromembrane extraction

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Electromembrane extraction (EME) performance is often limited by pH variations in acceptor solutions.
  • Electrolytically induced pH changes can negatively impact extraction efficiency and reproducibility.

Purpose of the Study:

  • To investigate the impact of optimized, pH-stable acceptor solutions on electromembrane extraction (EME) performance.
  • To evaluate the effectiveness of formic acid-based acceptor solutions in improving EME of basic drugs.

Main Methods:

  • Electromembrane extraction (EME) using 1-ethyl-2-nitrobenzene as a membrane.
  • Utilized optimized acceptor solutions containing 500 mM formic acid (pH 1.97).
  • Analyzed three basic drugs with varying extraction times (40-80 min) and applied voltage (50 V).

Main Results:

  • Optimized acceptor solutions eliminated pH variations, ensuring stable EME performance.
  • Achieved consistent extraction recoveries (66-89%) for basic drugs over extended periods.
  • Prevented back-extraction of analytes and maintained stable enrichment even with high analyte concentrations in the acceptor phase.

Conclusions:

  • pH-stabilized acceptor solutions significantly enhance the robustness and efficiency of electromembrane extraction.
  • Formic acid-based acceptor solutions offer a stable and effective medium for EME of basic drugs.
  • EME performance is improved by controlling acceptor solution chemistry, minimizing interference with subsequent analyses.