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Related Experiment Videos

Highly selective iodide membrane electrode based on a cerium salen.

Mohammad Reza Ganjali1, Tahereh Poursaberi, Morteza Hosseini

  • 1Department of Chemistry, Tehran University, Iran. Ganjali@khayam.ut.ac.ir

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|March 29, 2002
PubMed
Summary

A novel PVC membrane electrode using a cerium-salen complex offers high selectivity for iodide ions. This sensor demonstrates excellent performance for detecting iodide in various applications.

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Ion-selective electrodes (ISEs) are crucial for potentiometric analysis.
  • Developing selective sensors for specific anions remains a challenge.

Purpose of the Study:

  • To prepare and characterize a highly selective PVC membrane electrode for iodide ion detection.
  • To investigate the electrode's anti-Hofmeister selectivity and performance.

Main Methods:

  • Fabrication of a PVC membrane electrode incorporating a cerium-salen complex.
  • Potentiometric measurements to evaluate selectivity, Nernstian behavior, and detection limits.
  • Testing the electrode's performance across a range of pH values and in potentiometric titrations.

Main Results:

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  • The cerium-salen based electrode exhibited high selectivity for iodide over common anions, following an anti-Hofmeister sequence.
  • Near-Nernstian behavior was observed over a wide concentration range (5.0 x 10(-2) - 8.0 x 10(-6) M) with a slope of 57.5 mV/decade.
  • A detection limit of 6.0 x 10(-6) M, fast response time, and a usable pH range of 3.0-11.0 were achieved.

    • Conclusions:

    • The developed PVC membrane electrode demonstrates superior selectivity and sensitivity for iodide ions.
    • The electrode is suitable for direct potentiometric determination of iodide and as an indicator in titrations, such as for silver ions.