A copper ion-selective electrode with high selectivity prepared by sol-gel and coated wire techniques

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Ion-selective electrodes (ISEs) are crucial for detecting metal ions in various matrices.
• Thiosemicarbazone-based neutral carriers offer potential for developing selective ISEs.
• Sol-gel technology provides a robust matrix for sensor development.

Purpose of the Study:

• To develop and characterize a novel sol-gel based copper (II) ion-selective electrode.
• To compare the performance of the sol-gel electrode with a conventional coated wire electrode.
• To evaluate the stability, selectivity, and applicability of the sol-gel electrode for real sample analysis.

Main Methods:

• Fabrication of sol-gel and coated wire ion-selective electrodes using thiosemicarbazone as a neutral carrier.
• Electrochemical characterization including Nernstian response, detection limits, and selectivity studies.
• Evaluation of response time, pH range, and long-term stability over six months.
• Application in real sample analysis and potentiometric titration with EDTA.

Main Results:

• Both electrodes exhibited linear Nernstian responses for Cu (II) detection.
• The sol-gel electrode showed a linear range of 6.0 x 10(-6) - 1.0 x 10(-1) M with a detection limit of 6.0 x 10(-6) M.
• The sol-gel electrode demonstrated superior selectivity and stability over six months compared to the coated wire electrode.
• The sol-gel electrode was successfully applied to real sample analysis and potentiometric titrations.

Conclusions:

• A novel, stable, and selective sol-gel copper (II) ion-selective electrode was successfully developed.
• The sol-gel electrode offers significant advantages in terms of selectivity and long-term performance over coated wire electrodes.
• The proposed sol-gel electrode is a promising tool for the accurate determination of copper ions in aqueous solutions and real samples.