Sulfate-selective electrode based on a complex of copper

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Materials Science

Background:

• Sulfate determination is crucial in various industrial and pharmaceutical applications.
• Development of selective and sensitive electrodes is essential for accurate sulfate analysis.

Purpose of the Study:

• To develop a new sulfate-selective electrode.
• To characterize the electrode's performance and assess its applicability in real samples.

Main Methods:

• Fabrication of a membrane electrode using a copper(II) complex (CuL) as the carrier.
• Electrochemical characterization including Nernstian slope, linear range, and limit of detection determination.
• Selectivity assessment using the fixed interference method (FIM) and testing in various pH conditions.

Main Results:

• The developed electrode showed a good Nernstian slope (-29.5 mV/decade) and a wide linear range (1.0 x 10(-7) - 1.0 x 10(-1) M).
• A low limit of detection (1.0 x 10(-8) M) and a fast response time (10 s) were achieved.
• The electrode demonstrated stability for over three months and applicability in the pH range of 3.5 - 8.0.

Conclusions:

• The new sulfate-selective electrode exhibits excellent performance characteristics.
• The electrode is suitable for the direct determination of sulfate in complex matrices like pharmacy and cement samples.