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Published on: November 1, 2016
A PVC plasticized sensor for Ni(II) ion based on a simple ethylenediamine derivative
Krishnapillai Girish Kumar1, Remalakshmy Poduval, Pearl Augustine
1Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, India. giri@cusat.ac.in
Summary
A novel PVC membrane sensor demonstrates high selectivity for nickel(II) ions. This Schiff base ionophore-based sensor offers a reliable method for detecting nickel in various real-world samples.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Materials Science
Background:
- Development of selective ion-selective electrodes (ISEs) is crucial for accurate metal ion determination.
- Schiff bases are versatile ligands with potential applications in chemical sensing.
- Nickel(II) ion detection is important in environmental monitoring and industrial quality control.
Purpose of the Study:
- To construct and characterize a novel PVC membrane ion-selective electrode (ISE) for highly selective Ni(II) ion detection.
- To evaluate the sensor's performance in terms of Nernstian response, detection limit, response time, and operational stability.
- To assess the sensor's applicability in real-world samples and potentiometric titrations.
Main Methods:
- Fabrication of a PVC membrane using a Schiff base binaphthyl derivative as the ionophore.
- Electrochemical characterization using potentiometry to determine the Nernstian response and selectivity.
- Evaluation of operational parameters including concentration range, limit of detection, response time, pH range, and interference effects.
- Application testing in potentiometric titration of Ni(II) ions and direct determination in environmental and food samples.
Main Results:
- The developed sensor exhibited a good Nernstian response for Ni(II) ions over a wide concentration range (1.0x10⁻¹–5.0x10⁻⁶ M).
- A low limit of detection (1.3x10⁻⁶ M), fast response time, and good reproducibility were achieved.
- The sensor demonstrated excellent selectivity for Ni(II) ions over various interfering cations.
- Successful application in potentiometric titration and direct determination of nickel in effluent samples, chocolates, and hydrogenated oils was confirmed.
- The sensor maintained functionality over a 4-month period and operated effectively in a pH range of 3.6–7.4 and in the presence of 25% methanol or ethanol.
Conclusions:
- A highly selective and sensitive PVC membrane ion-selective electrode for Ni(II) ions was successfully constructed using a Schiff base binaphthyl ionophore.
- The sensor offers a robust and reliable analytical tool for Ni(II) determination in diverse matrices.
- The developed sensor presents a viable alternative for routine nickel analysis in environmental and industrial settings.
