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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...
Potentiometry: Overview01:06

Potentiometry: Overview

Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as the...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential ensures...
Potentiometric Titration: Overview01:31

Potentiometric Titration: Overview

Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
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...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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Updated: Jun 28, 2026

Potentiodynamic Corrosion Testing
08:43

Potentiodynamic Corrosion Testing

Published on: September 4, 2016

Studies on potentiometric stripping analysis.

T C Chau1, de Y Li, Y L Wu

  • 1Department of Chemistry, Jinan University, Guangzhou, China.

Talanta
|December 1, 1982
PubMed
Summary
This summary is machine-generated.

Potentiometric stripping analysis was investigated theoretically and experimentally. This electrochemical technique achieved a detection limit of 10(-12)M for lead (Pb) using dissolved oxygen as the oxidant.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Potentiometric stripping analysis (PSA) is an electrochemical method for determining metal ion concentrations.
  • Understanding diffusion processes is crucial for optimizing PSA sensitivity and accuracy.

Purpose of the Study:

  • To theoretically and experimentally investigate the method of potentiometric stripping analysis.
  • To derive and verify an equation relating elapsed time to metal and oxidant concentrations.
  • To explore the impact of complex formation on analysis time and detection limits.

Main Methods:

  • Solving Fick's second law of diffusion for metals in mercury amalgam.
  • Developing a theoretical model for the potential-time curve in PSA.
  • Experimental verification of the derived theoretical relationships.

Main Results:

  • A key equation was derived: tau = C(0)(R)l/k[Ox], linking analysis time (tau) to metal concentration (C(0)(R)), mercury film thickness (l), and oxidant concentration ([Ox]).
  • Experimental results confirmed the theoretical predictions.
  • A detection limit of 10(-12)M for lead (Pb) was achieved with a 4-min pre-electrolysis using dissolved oxygen as the oxidant, in the absence of complexation.

Conclusions:

  • The theoretical model accurately describes potentiometric stripping analysis.
  • PSA is a highly sensitive technique, capable of trace metal detection.
  • Control over oxidant concentration and understanding complexation are key for optimal PSA performance.