Journal of Chemical Sciences

, Volume 126, Issue 1, pp 33–40 | Cite as

N′, N′′, N′′′-tris(2-pyridyloxymethyl) ethane as ionophore in potentiometric sensor for Pb(II) ions

  • PAWAN KUMAR
  • ASHOK KUMAR S K
  • SUSHEEL K MITTAL
Article

Abstract

N,N,N″′ tris(2-pyridyloxymethyl) ethane (TPOME) has been used as an ionophore in a polyvinylchloride (PVC)-based membrane. Membrane electrode with a composition 30:5:62:3 (PVC:TPOME: o-NPOE:NaTPB) exhibits Nernstian response towards Pb(II) ions with a slope of 30 mV/decade, over a concentration range of 1 × 10 − 5 M to 1 × 10 − 1 M. Potential response remains almost unchanged over pH range of 3.7–6.4. The electrode shows fast response time of 15 ± 2 s and a lifetime of four months. It shows good selectivity for Pb(II) ions over other mono-, di- and trivalent cations. Electrode response is satisfactory in mixed solvent media up to 30% (v/v) non-aqueous contents. Selectivity of the ionophore for Pb(II) ions was determined by spectrophotometric method. The electrode can also be used as an indicator electrode in potentiometric titration of Pb(II) ions with standard chromate solution and its determination in real-life samples. Surface morphology of membrane electrode at different stages of its development and use is also discussed.

Graphical Abstract

N', N'', N''' tris(2-pyridyloxymethyl) ethane (TPOME) has been used as an ionophore in a PVC–based membrane. Membrane electrode with a composition 30: 5: 62: 3 (PVC:TPOME:o-NPOE:NaTPB) exhibits Nernstian response towards Pb(II) ions over a concentration range of 1x10-5M to 1x10-1M, working pH range 3.7–6.4, response time 15±2 s, good selectivity over other interfering ions, and lifetime of four months.

Keywords

PVC neutral carrier ionophore liquid membrane lead ions selectivity coefficients Nernstian response 

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Copyright information

© Indian Academy of Sciences 2014

Authors and Affiliations

  • PAWAN KUMAR
    • 1
  • ASHOK KUMAR S K
    • 2
  • SUSHEEL K MITTAL
    • 1
  1. 1.School of Chemistry and BiochemistryThapar UniversityPatialaIndia
  2. 2.Materials Chemistry Division, School of Advanced SciencesVIT UniversityVelloreIndia

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