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Cobalt(II)-selective membrane electrode based on a recently synthesized benzo-substituted macrocyclic diamide
M Shamsipur1, T Poursaberi, S Rouhani
1Department of Chemistry, Razi University, Kermanshah, Iran.
Summary
A new PVC-membrane electrode utilizing a macrocyclic diamide shows excellent Nernstian response for cobalt ions (Co2+). This selective and stable sensor offers a low detection limit for cobalt determination.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Materials Science
Background:
- Development of selective ion-selective electrodes (ISEs) is crucial for accurate metal ion detection.
- Macrocyclic compounds offer unique host-guest complexation properties for ion recognition.
Purpose of the Study:
- To present a novel PVC-membrane electrode for selective cobalt ion (Co2+) detection.
- To evaluate the electrode's performance characteristics, including response range, selectivity, and stability.
Main Methods:
- Synthesis of an 18-membered macrocyclic diamide ionophore.
- Fabrication of a PVC-membrane electrode incorporating the synthesized macrocycle.
- Potentiometric measurements to assess response linearity, selectivity, pH range, and detection limit.
Main Results:
- The electrode exhibited a Nernstian potentiometric response for Co2+ over a wide concentration range (2.0 x 10(-6)-1.0 x 10(-2) M).
- Excellent selectivity for Co2+ over various other metal ions was observed.
- The sensor demonstrated a fast response time (~10 s), long-term stability (>2 months), and a low detection limit (6.0 x 10(-7) M).
- The electrode operated effectively across a broad pH range (3.0-8.0).
Conclusions:
- The novel macrocyclic diamide-based PVC-membrane electrode is highly suitable for selective and sensitive Co2+ determination.
- The sensor's performance characteristics allow for direct determination and potentiometric titration of cobalt ions in various applications.