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Related Concept Videos

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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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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
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Voltammetric Techniques: Pulse Voltammetry01:17

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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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Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
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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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Voltammetric Techniques: Cyclic Voltammetry01:10

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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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Related Experiment Video

Updated: Nov 2, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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A simplified LED-driven switch for fast-scan controlled-adsorption voltammetry instrumentation.

Rhiannon Robke1, Parastoo Hashemi1, Eric Ramsson2

  • 1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, USA.

Hardwarex
|June 11, 2021
PubMed
Summary
This summary is machine-generated.

A simplified circuit using LEDs makes fast-scan controlled-adsorption voltammetry (FSCAV) more accessible for measuring dopamine and serotonin. This innovation lowers barriers for researchers without electronics expertise.

Keywords:
BasalCircuitComponentDopamineFast-scan cyclic voltammetryInstrumentation

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Area of Science:

  • Neuroscience
  • Analytical Chemistry
  • Biomedical Engineering

Background:

  • Fast-scan cyclic voltammetry (FSCV) is vital for real-time neurochemical analysis.
  • Specialized FSCV applications, like fast-scan controlled-adsorption voltammetry (FSCAV), require complex electronics.
  • FSCAV measures basal dopamine and serotonin levels but demands custom instrumentation.

Purpose of the Study:

  • To develop a simplified, accessible switching component for FSCAV.
  • To integrate FSCAV into existing FSCV instruments with minimal technical expertise.
  • To reduce the cost and complexity of FSCAV hardware.

Main Methods:

  • Designed a novel switching circuit using light-emitting diodes (LEDs) and an NPN bipolar junction transistor.
  • Compared the performance of the new LED-based circuit with traditional switching components.
  • Conducted in vitro and in vivo experiments to validate the system.

Main Results:

  • The simplified LED switching component performs comparably to existing, more complex instrumentation.
  • The new circuit effectively facilitates the switching between FSCV waveform and constant potential.
  • Demonstrated the feasibility of constructing the component without specialized engineering knowledge.

Conclusions:

  • Presents a cost-effective, user-friendly method for implementing FSCAV.
  • Increases the accessibility of FSCAV for studying dopamine and serotonin in vivo.
  • Empowers researchers without electronics backgrounds to utilize advanced neurochemical techniques.