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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.
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Electrodes: Overview

Electrodes: Overview

Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in the...

Indicators

Indicators

Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are called...

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...

Instrument Calibration

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Effects of EDTA on End-Point Detection Methods

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Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
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Related Experiment Video

Updated: Jun 5, 2026

Measurement of Extracellular Ion Fluxes Using the Ion-selective Self-referencing Microelectrode Technique

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Published on: May 3, 2015

New methods applicable for calibration of indicator electrodes.

Tadeusz Michałowski¹, Bogusław Pilarski, Maja Ponikvar-Svet

¹Faculty of Chemical Engineering and Technology, Cracow University of Technology, Cracow, Poland. michalot@o2.pl

|January 18, 2011

Summary

New methods for calibrating indicator electrodes using standard addition and subtraction techniques are proposed. These methods allow simultaneous determination of electrode slope and equivalence volume from potentiometric titration data, even in nonlinear ranges.

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Area of Science:

Analytical Chemistry
Electrochemistry
Chemical Measurement Science

Background:

Accurate calibration of indicator electrodes is crucial for reliable potentiometric titrations.
Existing methods may have limitations in determining multiple parameters simultaneously or in nonlinear ranges.

Purpose of the Study:

To introduce novel methods for indicator electrode calibration.
To enable simultaneous determination of electrode slope and equivalence volume.
To develop a new model for nonlinear calibration of ion-selective electrode (ISE) slope.

Main Methods:

Development of new calibration methods based on standard addition and standard subtraction.
Utilizing potentiometric titration data for simultaneous parameter determination.
Proposing and experimentally validating a new model for ISE slope calibration in nonlinear ranges.

Main Results:

The suggested methods allow simultaneous determination of indicator electrode slope and equivalence volume from a single titration dataset.
A new model for standard addition method calibration was developed and confirmed for nonlinear ISE slope (S).
Experimental validation confirmed the applicability of the new model in calcium ISE calibration.

Conclusions:

The proposed methods offer efficient and simultaneous calibration of indicator electrodes.
The new model extends the applicability of standard addition methods to nonlinear ISE slope ranges.
These advancements improve the accuracy and scope of potentiometric titration analysis.