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A conductive polypyrrole based ammonium ion selective electrode.

D P Quan¹, C X Quang, L T Duan

¹Centre of Environmental Chemistry, Vietnam National University, Hanoi.

Environmental Monitoring and Assessment

|August 23, 2001

Summary

A new solid-contact ammonium ion selective electrode was developed using polypyrrole. This sensor shows excellent selectivity and a fast response for ammonium detection in natural waters.

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Area of Science:

Electrochemistry
Chemical Sensing
Environmental Monitoring

Background:

Miniaturized sensor arrays are crucial for advanced analytical applications.
Solid-contact ion-selective electrodes (SC-ISEs) offer advantages over traditional designs.
Polypyrrole is a conductive polymer with potential for electrode modification.

Purpose of the Study:

To investigate a solid-contact ammonium ion selective electrode (SC-Am+ISE).
To evaluate the performance of a polypyrrole-based internal solid contact layer.
To assess the sensor's applicability in real-world environmental samples.

Main Methods:

Electrochemical deposition of polypyrrole on a glassy carbon electrode.
Fabrication of the SC-Am+ISE with a sensing membrane.

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Main Results:

The SC-Am+ISE demonstrated excellent selectivity for ammonium ions.
A linear response was observed over the pNH4+ range of 1-5.
The sensor exhibited a sensitive slope of 56.3 mV/decade.
Fast response times and good robustness were achieved.

Conclusions:

The developed polypyrrole-based SC-Am+ISE is a promising sensor for ammonium determination.
The sensor shows effective performance in natural water samples.
This technology contributes to advancements in miniaturized sensor arrays for environmental analysis.