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Related Concept Videos

Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

2.6K
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...
2.6K
Potentiometry: Overview01:06

Potentiometry: Overview

5.5K
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...
5.5K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

2.2K
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...
2.2K
Standard Electrode Potentials03:02

Standard Electrode Potentials

52.1K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
52.1K
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

845
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...
845
Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

923
Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
923

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Potentiodynamic Corrosion Testing
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DStat: A Versatile, Open-Source Potentiostat for Electroanalysis and Integration.

Michael D M Dryden1, Aaron R Wheeler2

  • 1Department of Chemistry, University of Toronto, Toronto, ON, Canada.

Plos One
|October 29, 2015
PubMed
Summary
This summary is machine-generated.

We developed DStat, an open-source potentiostat for electroanalytical measurements. It offers high sensitivity and precision, rivaling commercial instruments, and integrates with other systems for versatile lab use.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Instrumentation Design

Background:

  • Electroanalytical techniques rely on potentiostats for potential control.
  • Commercial potentiostats are often closed systems, hindering custom development and integration.
  • Existing lab-built potentiostats prioritize cost or portability over general lab usability and measurement quality.

Purpose of the Study:

  • Introduce DStat, an open-source, general-purpose potentiostat.
  • Provide a versatile, user-friendly, and high-performance instrument for electroanalytical measurements.
  • Facilitate integration with other scientific instruments and platforms.

Main Methods:

  • Designed and built the DStat open-source potentiostat.
  • Implemented picoampere current measurement capabilities and a USB-powered design.
  • Developed cross-platform software for user-friendly operation.
  • Conducted head-to-head performance comparisons with commercial and other open-source potentiostats.
  • Demonstrated integration with the DropBot digital microfluidics platform.

Main Results:

  • DStat achieves picoampere current measurement sensitivity.
  • Voltammetric measurements show higher sensitivity than CheapStat and are comparable to commercial units.
  • Potentiometric precision is similar to commercial pH meters.
  • DStat is inexpensive, easy to build, and modifiable.
  • Successful integration with the DropBot platform demonstrated versatility.

Conclusions:

  • DStat offers a valuable, open-source alternative to commercial potentiostats for general lab use.
  • It combines high performance (picoampere sensitivity, precise potentiometry) with ease of use and versatility.
  • DStat supports the open-source movement in analytical science, enabling tool adaptation to experimental needs.