Signal amplification by electro-oligomerisation for improved isoproturon detection.

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Electrochemical sensing requires sensitive and selective methods for environmental monitoring.
• Conventional stripping voltammetry can be limited by analyte detection limits and matrix interferences.

Purpose of the Study:

• To introduce and validate electro-oligomerisation stripping voltammetry for enhanced electrochemical sensing.
• To demonstrate the improved detection of isoproturon herbicide in spring water samples.

Main Methods:

• A novel potentiostatic accumulation step to form an oligomeric film on a glassy carbon electrode.
• Detection of the oligomeric film using cathodic stripping square wave voltammetry (SWV).
• Characterization of the film using confocal Raman spectroscopy and cyclic voltammetry.

Main Results:

• Successful formation and characterization of a reversible electrodeposited oligomeric film.
• Enhanced sensitivity for isoproturon detection, with a linear response from 10-100 μM.
• Improved sensor performance in real water samples due to a mesoporous silica membrane with permselective properties.

Conclusions:

• Electro-oligomerisation stripping voltammetry offers a promising approach for sensitive electrochemical detection.
• The integration of nanoporous membranes enhances sensor selectivity and robustness against fouling.
• The developed method has potential for detecting other challenging analytes.