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Transition Metal Chemistry

, Volume 33, Issue 8, pp 995–1001 | Cite as

Fabrication of an iron(III)-selective PVC membrane sensor based on a bis-bidentate Schiff base ionophore

  • Hassan Ali ZamaniEmail author
  • Mohammad Reza Ganjali
  • Masoud Salavati-Niasari
Article

Abstract

A Fe3+ ion-selective membrane sensor was fabricated from polyvinyl chloride (PVC) matrix membrane containing bis-bidentate Schiff base (BBS) as a neutral carrier, sodium tetraphenyl borate (NaTPB) as anionic excluder, and o-nitrophenyloctyl ether (NPOE) as a plasticizing solvent mediator. The effects of the membrane composition, pH, and additive anionic influence on the response properties were investigated. The best performance was obtained with a membrane containing 32% PVC, 62.5% NPOE, 3% BBS, and 2.5% NaTPB. The electrode shows a Nernstian behavior (slope of 19.3 ± 0.6) over a very wide iron ion concentration range (1.0 × 10−7–1.0 × 10−2 M) and has a low detection limit (7.4 × 10−8 M). The potentiometric response of the sensor is independent of pH of the solution in the pH range 1.9–5.1. The proposed sensor has a very low response time (<15 s) and a good selectivity relative to a wide variety of other metal ions including common alkali, alkaline earth, heavy, and transition metal ions. The electrode can be used for at least 60 days without any considerable divergence in potentials. The proposed sensor was successfully applied as an indicator electrode for the potentiometric titration of 1.0 × 10−2 M Fe3+ ions with a 1.0 × 10−4 M EDTA and the direct determination of Fe3+ in mineral water and wastewater samples.

Keywords

Selectivity Coefficient Membrane Electrode Membrane Sensor Potentiometric Response Benzyl Acetate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors gratefully acknowledge the financial support of this research proposal, provided by the Research Council of the Quchan Islamic Azad University.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Hassan Ali Zamani
    • 1
    Email author
  • Mohammad Reza Ganjali
    • 2
    • 3
  • Masoud Salavati-Niasari
    • 4
  1. 1.Young Researchers Club, Quchan BranchIslamic Azad UniversityQuchanIran
  2. 2.Center of Excellence in Electrochemistry, Faculty of ChemistryUniversity of TehranTehranIran
  3. 3.Endocrine & Metabolism Research CenterTehran University of Medical SciencesTehranIran
  4. 4.Department of Chemistry, Faculty of ScienceUniversity of KashanKashanIran

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