A new macrocyclic polystyrene-based sensor for chromium (III) ions.

Area of Science:

• Analytical Chemistry
• Materials Science
• Electrochemistry

Background:

• Development of selective ion-exchange materials is crucial for accurate metal ion detection.
• Macrocyclic ligands offer unique coordination properties for ion recognition.
• Existing methods for chromium detection can lack selectivity or require complex sample preparation.

Purpose of the Study:

• To synthesize and characterize a new tetradentate dihydrogen perchlorate macrocyclic ligand.
• To develop a polystyrene-based membrane electrode using this ligand for selective Cr3+ ion detection.
• To evaluate the performance and practical applicability of the developed Cr3+ sensor.

Main Methods:

• Synthesis and characterization of the macrocyclic ligand.
• Fabrication of a polystyrene-based membrane electrode incorporating the ligand.
• Electrochemical measurements including potentiometry and selectivity studies.
• Testing the electrode's performance in various matrices and applications.

Main Results:

• The synthesized macrocycle acts as a selective ion-exchanger for metal ions.
• The membrane electrode exhibits high selectivity for Cr3+ ions over a wide concentration range (3.16x10^-6-1.00x10^-1 M).
• The electrode shows a fast response time (15 s), good reproducibility over three months, and minimal interference from common anions and organic solvents.
• Successful application as an indicator electrode for potentiometric titration and determination of Cr3+ in food samples.

Conclusions:

• The novel macrocyclic ligand-based membrane electrode is a promising tool for selective and sensitive Cr3+ determination.
• The sensor demonstrates robustness and applicability in complex real-world samples, including food.
• This development offers a valuable advancement in electrochemical sensing for environmental and food safety monitoring.