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Related Concept Videos

Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
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Amperometry: Overview

Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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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 the...
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Voltammetric Techniques: Pulse Voltammetry

Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
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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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Use of Enzymatic Biosensors to Quantify Endogenous ATP or H2O2 in the Kidney
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Published on: October 12, 2015

Cyclic biamperometry.

Mehdi Rahimi1, Susan R Mikkelsen

  • 1Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.

Analytical Chemistry
|February 5, 2010
PubMed
Summary
This summary is machine-generated.

Cyclic biamperometry accurately quantifies redox species, even when concentrations differ significantly. This method is adaptable for microscale devices without a reference electrode.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry

Background:

  • Quantifying redox couples often requires complex setups.
  • Distinguishing between redox species in solution presents analytical challenges.

Purpose of the Study:

  • To investigate cyclic biamperometry for quantifying one redox species in the presence of another.
  • To assess the method's performance with the ferri-ferrocyanide couple.

Main Methods:

  • Utilized a triangular voltage waveform across two gold electrodes.
  • Measured electrode-to-solution potential to estimate interfacial impedance.
  • Analyzed peak currents in relation to voltage scan rates and concentrations.

Main Results:

  • Peak currents showed a square root dependence on scan rate when one redox form was in excess.
  • Effective scan rates at electrodes were calculated using impedance data.
  • Linear dependence of peak current on the limiting species concentration was observed.
  • Discrepancies arose when redox forms were near equimolar.

Conclusions:

  • Cyclic biamperometry is effective for quantifying excess redox species.
  • The method's potential for integration into lab-on-a-chip devices was highlighted.
  • No reference electrode is needed, simplifying device design.