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Related Concept Videos

Voltammetry: Overview01:20

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 Measurements01:21

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...
Voltammetric Techniques: Pulse Voltammetry01:17

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 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...
Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

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...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...

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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Voltammetric determination of cadmium(II) using a chemically modified electrode.

S Hu1, K Wu, H Yi

  • 1Department of Chemistry, Wuhan University, P.R. China.

Fresenius' Journal of Analytical Chemistry
|June 8, 2001
PubMed
Summary

A novel 1-(pyridylazo)-2-naphthol modified glassy carbon electrode effectively detects trace cadmium ions (Cd2+). This sensor offers high sensitivity and accuracy for environmental water sample analysis.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Environmental Science

Background:

  • Cadmium (Cd2+) is a toxic heavy metal pollutant.
  • Accurate detection of trace Cd2+ is crucial for environmental monitoring.
  • Electrochemical sensors offer sensitive and selective detection methods.

Purpose of the Study:

  • To develop and validate a new electrochemical sensor for trace Cd2+ detection.
  • To investigate the performance of a 1-(pyridylazo)-2-naphthol modified glassy carbon electrode.
  • To assess the sensor's applicability for real-world water sample analysis.

Main Methods:

  • Modification of a glassy carbon electrode with 1-(pyridylazo)-2-naphthol (PAN).
  • Electrochemical deposition of Cd2+ onto the modified electrode surface at -1.10 V (vs. SCE).
  • Oxidation of deposited Cd-PAN and recording of voltammograms for quantification.

Main Results:

  • Linear calibration plots obtained for Cd2+ in the range of 2 x 10(-8) to 8 x 10(-7) mol/L.
  • Achieved a low detection limit of 5 x 10(-10) mol/L for Cd2+.
  • Demonstrated high accuracy with an average recovery of 98.78% in water samples.

Conclusions:

  • The PAN-modified glassy carbon electrode is a sensitive and reliable sensor for trace Cd2+.
  • The developed method shows excellent potential for environmental water quality monitoring.
  • This sensor provides a cost-effective and efficient approach for cadmium analysis.