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Related Experiment Videos

Sulfate-selective PVC membrane electrode based on a strontium Schiff's base complex.

Mohammad Reza Ganjali1, Parviz Norouzi, Mahmood Gol-Mohammadi

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

Annali Di Chimica
|August 28, 2003
PubMed
Summary

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A novel strontium Schiff

Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Materials Science

Background:

  • Ion-selective electrodes (ISEs) are crucial for chemical analysis.
  • Developing selective and sensitive ISEs requires careful selection of ionophores and membrane components.
  • PVC-based membranes offer a versatile platform for ISE development.

Purpose of the Study:

  • To develop a sulfate-selective PVC-based membrane electrode using a strontium Schiff's base complex as an ionophore.
  • To investigate the influence of additives and solvent mediators on electrode performance.
  • To evaluate the sensor's analytical characteristics and applicability in real samples.

Main Methods:

  • Fabrication of PVC-based membrane electrodes incorporating a strontium Schiff's base complex (SS) as the ionophore.

Related Experiment Videos

  • Optimization of membrane composition using additives like oleic acid (OA) and hexadecyltrimethylammonium bromide (HTAB), and solvent mediators (nitrobenzene, dibutyl phthalate, benzyl acetate).
  • Electrochemical characterization including potentiometric measurements, Nernstian slope determination, limit of detection, response time, and anion interference studies.

    • Main Results:

    • The optimized membrane composition (PVC: NB: SS: HTAB, 30%: 62%: 5%: 3%) yielded a highly selective sulfate electrode.
    • The sensor exhibited a wide linear concentration range (1.0 x 10(-2) to 1.0 x 10(-6) M) with a Nernstian slope of -29.2 mV/decade.
    • A low limit of detection (5 x 10(-7) M), fast response time (15 s), and excellent selectivity against various anions were achieved.
    • The electrode successfully determined zinc in zinc sulfate tablets and served as an indicator in potentiometric titrations.

    Conclusions:

    • A strontium Schiff's base complex is an effective ionophore for developing a sulfate-selective PVC-based membrane electrode.
    • The developed sensor demonstrates excellent performance, selectivity, and rapid response for sulfate determination.
    • The proposed electrode holds potential for practical applications in environmental monitoring and quality control analysis.