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Related Experiment Video

Updated: Jul 13, 2026

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

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Published on: May 3, 2015

Voltammetric and reference microelectrodes with integrated microchannels for flow through microvoltammetry. 1. The

Keller¹, Buffle

¹CABE, Department of Inorganic, Analytical and Applied Chemistry, Sciences II, Geneva University, Switzerland.

Analytical Chemistry

|March 30, 2000

Summary

This study presents novel microsensor units for precise heavy-metal detection in natural waters using voltammetry. The developed system offers reliable, on-line analysis with enhanced protection against sample fouling.

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Area of Science:

Analytical Chemistry
Environmental Science
Materials Science

Background:

Heavy-metal contamination in natural waters poses significant environmental and health risks.
Accurate and reliable on-line monitoring methods are crucial for effective environmental management.
Existing analytical techniques can be limited by fouling and stability issues in complex media.

Purpose of the Study:

To develop and characterize two microsensor units for on-line voltammetric detection of heavy metals.
To address challenges of fouling and stability in microanalytical systems for environmental water samples.
To enable precise heavy-metal analysis in complex matrices like natural waters.

Main Methods:

Construction of a working microsensor unit with a mercury-plated iridium microelectrode protected by an agarose gel (C18 phase).
Fabrication of a reference and auxiliary microsensor unit featuring an iridium oxide-based mini reference electrode and a platinum auxiliary electrode.
Integration of solution renewal channels and testing for long-term reliability, precision, and stability in microcells.

Main Results:

The protective agarose gel layer effectively prevents fouling by hydrophobic and surface-active molecules.
The iridium oxide reference electrode demonstrates high stability (1-2 mV drift/day) and a lifetime exceeding one year.
The microsensor units are validated for precise heavy-metal analysis in microanalytical systems, including those with limited sample volumes.

Conclusions:

The developed microsensor units provide a robust and efficient solution for on-line heavy-metal monitoring in complex environmental samples.
The anti-fouling strategy using agarose gel is broadly applicable and highly effective.
The stable reference electrode and overall system design ensure reliable and precise voltammetric analysis in microfluidic systems.