Title of article
Benzo15-crown-5 as Sensory Molecule for Fabrication of a Lead(II) Ion-selective Potentiometric Sensor
Author/Authors
Heidari Parisa نويسنده Phase Equilibria Research Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan, 45371-38791, Zanjan, Iran , Zamani Abbasali نويسنده Environmental Science Research Laboratory, Department of Environmental Science, Faculty of Science, University of Zanjan, 45371-38791, Zanjan, Iran , Koorepazan Moftakhar Mahdieh نويسنده Phase Equilibria Research Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan, 45371-38791, Zanjan, Iran , Yaftian Mohammad Reza . نويسنده Phase Equilibria Research Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan, 45371-38791, Zanjan, Iran
Pages
12
From page
733
To page
744
Abstract
Benzo15-crown-5 (B15C5) has been examined as an ion sensing material for
fabricating a PVC membrane lead ion-selective potentiometric sensor. The best performance
of the electrode was observed with a membrane composition formed by 29% PVC, 60%
dibutylphthalate (DBP) as plasticizing solvent mediator, 2% sodium tetraphenylborate
(NaTPB) as ion excluder and 9% of B15C5 as ionophore. The electrode presents a nearly
Nernstian response (a slope of 29.7±0.5 mV/decade) over a concentration range 1×10-5-1×10-
3 M of lead ions, with a limit of detection 8.4×10-6 M. Its potential response was independent
on pH variation in the range 2.8-4.5. The dynamic response time of the electrode to achieve a
steady potential was found to be about 25 seconds. The selectivity of the prepared electrode
relative to some mono-, di-, tri- and tetra-valent metal ions was examined. This electrode can
be used for 2 months without considerable divergences in the potential response. It was
successfully used as an indicator electrode for the complex formation titration of lead inwater
sampless by EDTA
Journal title
Astroparticle Physics
Serial Year
2014
Record number
2412451
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