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Related Concept Videos

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...
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

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 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...
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: 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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Related Experiment Video

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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
09:18

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Published on: June 21, 2017

Trace-metal determination by second-harmonic alternating-current anodic stripping voltammetry.

C Locatelli1, F Fagioli, C Bighi

  • 1Department of Chemistry, University of Ferrara, Via L. Borsari 46, 44100 Ferrara, Italy.

Talanta
|March 1, 1986
PubMed
Summary
This summary is machine-generated.

Second-harmonic alternating-current voltammetry combined with anodic stripping enables sensitive, selective trace metal detection. This method accurately determines elements like tin, lead, indium, and cadmium at low concentrations.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry

Background:

  • Trace metal analysis requires high selectivity and sensitivity.
  • Second-harmonic alternating-current voltammetry offers selectivity but lacks sensitivity for trace levels.
  • Anodic stripping voltammetry provides high sensitivity but can struggle with complex matrices.

Purpose of the Study:

  • To develop a sensitive and selective method for sequential determination of trace metals with similar half-wave potentials.
  • To combine the strengths of second-harmonic alternating-current voltammetry and anodic stripping.
  • To establish a reliable analytical technique for challenging metal analyses.

Main Methods:

  • Utilized second-harmonic alternating-current voltammetry coupled with anodic stripping.
  • Employed a three-electrode cell with a sessile-drop mercury electrode (drop-time 240-300 sec).
  • Analyzed tin/lead and indium/cadmium mixtures in 1M hydrochloric acid.

Main Results:

  • Achieved sequential determination of electroactive species with half-wave potential differences as low as 35-45 mV.
  • Established a detection limit of 10(-8)M for tin, lead, indium, and cadmium.
  • Demonstrated high precision (2-3% relative standard deviation) and accuracy (1-2% relative error).

Conclusions:

  • The combined voltammetric technique is highly effective for simultaneous trace metal determination.
  • This method overcomes limitations of individual techniques, offering both selectivity and sensitivity.
  • The approach is validated for complex analyses, including environmental and industrial samples.