Potentiometric sensor for atrazine based on a molecular imprinted membrane

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Atrazine is a widely used herbicide with significant environmental implications.
• Developing selective and sensitive detection methods for atrazine is crucial for environmental monitoring.
• Molecularly imprinted polymers (MIPs) offer a promising platform for creating selective recognition sites.

Purpose of the Study:

• To synthesize a macropore-free molecular imprinted polymer (MIP) membrane for atrazine detection.
• To implement this MIP membrane in a potentiometric sensor for sensitive and selective atrazine determination.
• To evaluate the sensor's performance characteristics, including detection range, response time, and stability.

Main Methods:

• Synthesis of a molecular imprinted polymer (MIP) membrane without macropores.
• Fabrication of a potentiometric sensor utilizing the MIP membrane as the recognition element.
• Potentiometric measurements were conducted in acidic solutions (pH < 1.8) to ensure atrazine protonation.
• Analysis of the membrane potential response as a function of atrazine concentration.

Main Results:

• The MIP membrane-based potentiometric sensor exhibited a wide linear response range for atrazine detection (3 x 10(-5) to 1 x 10(-3)M).
• A Nernstian-like slope of approximately 25 mV/decade was observed, indicating specific binding of protonated atrazine species.
• The sensor demonstrated a rapid response time of less than 10 seconds and operational stability for over two months.

Conclusions:

• The developed MIP membrane is effective for creating a selective potentiometric sensor for atrazine.
• The sensor's performance is influenced by solution acidity and the concentration of atrazine released by the membrane.
• This MIP-based sensor offers a stable and responsive tool for atrazine monitoring in environmental samples.