Galvanic cell without liquid junction for potentiometric determination of copper

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Conventional copper ion-selective electrodes face limitations in non-aqueous media and in the presence of interfering ions like chloride.
• Developing robust electrochemical sensors for accurate copper determination is crucial for various applications.

Purpose of the Study:

• To develop and characterize an integrated galvanic cell for potentiometric measurements of copper ions.
• To evaluate the performance of the cell in challenging matrices, including non-aqueous solutions and chloride-containing samples.

Main Methods:

• Fabrication of a copper-sensitive indicator electrode using poly(3,4-ethylenedioxythiophene) (PEDOT) doped with Arsenazo-I.
• Construction of a reference electrode based on PEDOT doped with 2-morpholineoethanesulfonic acid (MES).
• Potentiometric measurements were performed in various media to assess the cell's performance.

Main Results:

• The developed galvanic cell demonstrated effective potentiometric measurements for copper determination.
• The cell showed reliable performance in non-aqueous media, outperforming traditional PVC-based membranes.
• The sensor successfully operated in the presence of chloride ions, overcoming a common limitation of conventional electrodes.

Conclusions:

• The integrated galvanic cell with conducting polymer electrodes offers a promising alternative for copper analysis.
• This technology provides a robust solution for copper determination in complex matrices where other methods fail.
• The cell is suitable for monitoring copper ion titrations, enhancing analytical capabilities.