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Related Concept Videos

Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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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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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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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.
The chosen potential...
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Voltammetric Techniques: Linear-Scan (E vs Time)01:12

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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
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Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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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.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Updated: Dec 4, 2025

Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
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Capacitively coupled contactless conductivity detection for analytical techniques - Developments from 2018 to 2020.

Peter C Hauser1, Pavel Kubáň2

  • 1Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056, Basel, Switzerland.

Journal of Chromatography. A
|October 23, 2020
PubMed
Summary

Contactless conductivity measurements using capacitive coupling advanced significantly between 2018-2020. Applications expanded in electrophoresis, lab-on-chip devices, and flow-based analyses, including bubble detection and titration endpoints.

Keywords:
Capacitively coupled contactless conductivity detectionCapillary electrophoresisMicrochip electrophoresisReview

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Instrumental Analysis

Background:

  • Contactless conductivity measurements offer advantages over traditional methods by avoiding direct contact with the sample.
  • Capacitive coupling provides a robust mechanism for these non-invasive measurements.
  • Recent advancements have focused on refining the technique for diverse analytical applications.

Purpose of the Study:

  • To review developments in analytical contactless conductivity measurements via capacitive coupling from mid-2018 to mid-2020.
  • To highlight key applications and emerging trends in the field.
  • To document innovations in measurement cell design and electronics.

Main Methods:

  • Review of scientific literature published between mid-2018 and mid-2020.
  • Focus on applications in zone electrophoresis, lab-on-chip devices, and other flow-based analytical methods.
  • Analysis of reported variations in measuring cell designs and read-out electronics.

Main Results:

  • Significant progress in applying contactless conductivity to zone electrophoresis and lab-on-chip systems.
  • Successful detection of bubbles and flow rate measurements in two-phase flows.
  • New applications identified in titrations and paper-based devices for stagnant samples.

Conclusions:

  • Contactless conductivity measurements based on capacitive coupling have shown broad applicability and development.
  • The technique is increasingly valuable for microfluidic devices and flow analysis.
  • Further innovations in instrumentation and application are anticipated.