Co2+-selective membrane electrode based on the Schiff Base NADS.

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Materials Science

Background:

• Cobalt(II) ion detection is crucial in environmental and industrial monitoring.
• Development of selective and sensitive electrochemical sensors is an ongoing research area.
• Schiff base compounds offer versatile coordination properties for ion sensing.

Purpose of the Study:

• To synthesize and characterize a new Schiff base for cobalt(II) ion detection.
• To develop a PVC membrane electrode based on the synthesized Schiff base.
• To evaluate the performance of the developed electrode for cobalt(II) ion sensing.

Main Methods:

• Synthesis of 5-((4-nitrophenyl)azo)-N-(2',4'-dimethoxyphenyl)salicylaldimine Schiff base.
• Fabrication of a PVC membrane electrode incorporating the Schiff base.
• Electrochemical characterization using potentiometry.
• Testing selectivity against various interfering ions.
• Application in potentiometric titrations and direct determination of cobalt(II) ions.

Main Results:

• The electrode showed a Nernstian response for cobalt(II) ions over a wide concentration range (9.0 x 10(-7) to 1.0 x 10(-2) M).
• A low limit of detection (8.0 x 10(-7) M) and a slope of 29(+/-1) mV/decade were achieved.
• The sensor demonstrated excellent selectivity for cobalt(II) ions over other metal cations.
• The electrode functioned effectively within a pH range of 3.5-6.0.

Conclusions:

• The developed PVC membrane electrode based on the novel Schiff base is a sensitive and selective sensor for cobalt(II) ions.
• The electrode is suitable for direct determination of cobalt(II) in aqueous solutions and potentiometric titrations.
• This Schiff base-based sensor presents a promising alternative for cobalt(II) ion analysis.