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Potentiometry: Membrane Electrodes

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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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Related Experiment Video

Updated: Jun 28, 2026

Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

Published on: June 1, 2012

A polymer membrane potentiometric sensor for silver.

M R Bates¹, T J Cardwell, R W Cattrall

¹Centre for Scientific Instrumentation, School of Chemistry, La Trobe University, Bundoora, Vic. 3083, Australia.

|July 1, 1995

Summary

This summary is machine-generated.

New sulfur-containing compounds were synthesized for silver ion (Ag+) sensing. The pyridine-based sensor demonstrated high selectivity and rapid response, ideal for flow analysis applications.

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Area of Science:

Analytical Chemistry
Materials Science
Electrochemistry

Background:

Development of selective and sensitive sensors for metal ion detection is crucial.
Neutral carrier-based ion-selective electrodes (ISEs) offer a robust platform for ion sensing.
Sulfur-containing organic compounds present unique properties for coordination chemistry.

Purpose of the Study:

To synthesize novel sulfur-containing compounds for potential use as neutral carriers in ion-selective sensors.
To evaluate the performance of these compounds as silver ion (Ag+) sensors.
To identify compounds with high selectivity and rapid response for Ag+ detection.

Main Methods:

Synthesis of four new sulfur-containing heterocyclic compounds (pyridine, benzene, 1,8-naphthyridine, 1,10-phenanthroline derivatives).
Incorporation of synthesized compounds into a polymeric membrane matrix.
Electrochemical evaluation of the polymeric sensors for Ag+ detection, including selectivity and response time measurements.

Main Results:

Two synthesized compounds, based on pyridine and benzene, exhibited high selectivity for Ag+.
The pyridine-based sensor displayed a near-Nernstian response to Ag+.
This sensor showed good sensitivity and a rapid response time (less than 10 seconds).

Conclusions:

Novel sulfur-containing compounds can be effectively utilized as neutral carriers in Ag+ sensors.
The pyridine-based sensor is a promising candidate for real-time Ag+ monitoring in flow analysis systems.
The study highlights the potential of tailored organic synthesis for developing advanced electrochemical sensors.