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Voltammetry: Overview

Voltammetry: Overview

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.
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...

Voltammetry: Factors Affecting Measurements

Voltammetry: Factors Affecting Measurements

A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...

Voltammograms: Overview

Voltammograms: Overview

Voltammograms are current plots as a function of applied potential, offering insights into electrochemical systems. The shape of a voltammogram depends on how the current is measured and whether convection (heat transfer by fluid movement) is present or absent.
Shapes of Voltammograms

Voltammetric Techniques: Linear-Scan (E vs Time)

Voltammetric Techniques: Linear-Scan (E vs Time)

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...

Voltammetric Techniques: Pulse Voltammetry

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...

Voltammetric Techniques: Cyclic Voltammetry

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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Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy

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Bioanalytical utility of sonovoltammetry.

E L Beckett¹, N S Lawrence, Y C Tsai

¹Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, OX1 3QZ, Oxford, UK.

Journal of Pharmaceutical and Biomedical Analysis

|October 16, 2001

Summary

Ultrasonic fields enhance dopamine detection by improving electrode performance and signal linearity. This method offers a novel approach for sensitive and selective electroanalysis, overcoming common interference issues.

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Published on: December 22, 2020

Area of Science:

Electrochemistry
Analytical Chemistry
Biomedical Engineering

Background:

Electrode contamination is a significant challenge in electroanalytical measurements, affecting accuracy and sensitivity.
Ultrasonic energy offers potential for in situ electrode cleaning and signal enhancement.
Dopamine detection is crucial in neuroscience and clinical diagnostics.

Purpose of the Study:

To investigate the efficacy of ultrasonically mediated in situ cleaning for reactivating contaminated electrodes.
To evaluate the benefits of applying an ultrasound field during electroanalytical measurements of dopamine.
To assess the method's ability to maintain selectivity in the presence of interfering species.

Main Methods:

Utilized dopamine in egg homogenate as a model system for electroanalytical studies.
Employed ultrasonically mediated in situ cleaning and applied ultrasound during oxidative measurements.
Compared sonolinear sweep voltammetry with conventional rotating disk electrode measurements.
Investigated the effect of cupric ion addition to mitigate ascorbate interference.

Main Results:

Maintaining the ultrasound field during measurements resulted in linear hydrodynamic profiles for dopamine (2-20 microM).
Sonolinear sweep voltammetry yielded significantly increased limiting currents compared to conventional methods.
Limiting currents were tunable by manipulating ultrasound field intensity.
Addition of cupric ion effectively eliminated ascorbate interference, preserving selectivity.

Conclusions:

Ultrasonic fields provide a viable method for in situ electrode cleaning and enhancing electroanalytical performance.
Sonolinear sweep voltammetry offers improved sensitivity and linearity for dopamine detection.
The developed method demonstrates robustness against common interferences, enhancing its practical applicability.