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Related Concept Videos

Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

343
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...
343
Potentiometry: Overview01:06

Potentiometry: Overview

3.0K
Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
3.0K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

897
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...
897
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

1.0K
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...
1.0K
Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

382
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...
382
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

521
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...
521

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A Microprocessor Controlled Potentiostat for Electrochemical Measurements.

M I Cohen1, P A Heimann1

  • 1National Measurement Laboratory, National Bureau of Standards, Washington, D. C. 20234.

Journal of Research of the National Bureau of Standards (1977)
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

A microprocessor-controlled system enables automated laboratory potentiostat operation. This programmable system enhances experimental flexibility and unattended control for electrochemical analysis.

Keywords:
Controlconverter (digital and analog)electrochemical measurementsmicrocomputermicroprocessorpotentiostat

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Area of Science:

  • Electrochemistry
  • Laboratory Automation
  • Instrumentation

Background:

  • Standard laboratory potentiostats require manual operation for electrochemical experiments.
  • Unattended operation is desirable for long-term or complex electrochemical studies.
  • Microprocessor control offers potential for enhanced functionality and automation.

Purpose of the Study:

  • To describe a novel microprocessor-based system for controlling a standard laboratory potentiostat.
  • To enable unattended and flexible operation of potentiostat instrumentation.
  • To enhance the capabilities of existing potentiostat setups through programmable control.

Main Methods:

  • Development of a control system centered around a microprocessor.
  • Integration of essential components: central processing unit, 16 KB RAM, peripheral interfaces, timer, and data converters (digital-to-analog and analog-to-digital).
  • Programming the central processor to manage potentiostat functions.

Main Results:

  • The described system successfully controls a standard laboratory potentiostat.
  • The system facilitates unattended operation, reducing the need for constant manual intervention.
  • Programmable control via the central processor allows for flexible experimental setups and execution.

Conclusions:

  • The microprocessor-based system provides a viable solution for automated and flexible potentiostat control.
  • This automation enhances the efficiency and scope of electrochemical experiments.
  • The system's design allows for adaptation and integration into various laboratory settings.