A PVC Membrane Electrode for Zirconium Based on 4-Nitrophenylazo-n-(2-hydroxypropylamine) Salicylidine

Year 2012, Volume: 25 Issue: 3, 609 - 616, 19.07.2012

Tayebeh Shamspur Mahdieh Sheıkhshoaıe Mohammad Hossin Mashhadızadeh Samira Saeednıa

Abstract

A potentiometric zirconium sensor based on the use of 4-nitrophenylazo-N-(2-hydroxypropylamine)salicylidine (NHPS) as an ion carrier in poly (vinyl chloride) (PVC) matrix, was developed. The best performance was observed for the membrane composition including 26.27% PVC, 65.67% N-POE, 5.43% NaTPB and 2.63% ionophore.The electrode which can be used for at least 1 month without observing any deviation exhibited a Nernstian slope of 29.37 mV per decade and a linear range of 1.0×10-2 to2.0×10-7   mol L-1, with a detection limit of 2.0×10−8 mol L−1, for zirconium ion. Also it showed a fast response time of about 10 s. The proposed membrane sensor revealed good selectivity for zirconium ion over a wide variety of other metal ions and could be used in pH range of 5–9.5. It was successfully used as an indicator electrode in potentiometric titration of zirconium ion. 

Keywords

Ion selective electrode, Zirconium, Potentiometry, Schiff base

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