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Potentiometry: Types of Electrodes

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...

Voltammetry: Stripping Methods

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...

Controlled-Potential Coulometry: Electrolytic Methods

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...

Potentiometry: Membrane Electrodes

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...

Electrodeposition

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...

Potentiometry: Overview

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...

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Updated: Jun 28, 2026

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

Published on: January 6, 2016

Potentiometric detection of ascorbate using a graphite carbon electrode.

Z Chen¹, J C Yu

¹Department of Plant Sciences, The University of Western Australia, Nedlands, WA 6907, Australia.

|October 31, 2008

Summary

This summary is machine-generated.

A novel graphite carbon electrode offers sensitive and selective potentiometric detection of ascorbate (vitamin C). This method provides a low detection limit, ideal for various analytical applications.

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Published on: April 18, 2013

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Last Updated: Jun 28, 2026

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

Published on: January 6, 2016

Multi-analyte Biochip (MAB) Based on All-solid-state Ion-selective Electrodes (ASSISE) for Physiological Research

Multi-analyte Biochip (MAB) Based on All-solid-state Ion-selective Electrodes (ASSISE) for Physiological Research

Published on: April 18, 2013

Area of Science:

Electrochemistry
Analytical Chemistry
Materials Science

Background:

Ascorbate (vitamin C) is a crucial biomolecule with diverse applications.
Accurate and sensitive detection methods for ascorbate are essential in various fields.
Existing detection methods may have limitations in sensitivity, selectivity, or cost.

Purpose of the Study:

To develop and characterize a graphite carbon electrode for the potentiometric detection of ascorbate.
To investigate the response mechanism and performance of the developed electrode.
To assess the sensitivity, selectivity, and reproducibility of the ascorbate detection method.

Main Methods:

Potentiometric measurements using a graphite carbon electrode.
Electrochemical techniques including voltammetry.
Surface analysis using scanning electron microscopy (SEM).
Experiments conducted in 0.1 M NaOH solution at pH 12-13.

Main Results:

The graphite carbon electrode demonstrated a linear potentiometric response for ascorbate detection.
The electrode exhibited a slope of -42+/-1.0 mV decade(-1) over a concentration range of 5x10(-4) to 5.0x10(-2) M.
A low detection limit of 5.0x10(-6) M was achieved.
SEM, potentiometry, and voltammetry suggested an ion-exchange adsorption and oxidation mechanism for ascorbate on the electrode surface.
The electrode showed high sensitivity, selectivity, and reproducibility.

Conclusions:

The developed graphite carbon electrode is a viable tool for sensitive and selective ascorbate detection.
The potentiometric method offers a promising approach for analyzing ascorbate in relevant matrices.
The electrode's performance indicates its potential for practical analytical applications.