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Zirconium(IV) Phosphoborate-Based Ion Selective Membrane Electrode for Potentiometric Determination of Ba(II) Ions

Sandeep Kaushal1,2, Susheel K Mittal3, Anirudh Pratap Singh2 and Pritpal Singh1,*

1Department of Chemistry, Sri Guru Granth Sahib World University, Fatehgarh Sahib-140 407, India

2Department of Chemistry, I.K. Gujral Punjab Technical University, Jalandhar-144 603, India

3School of Chemistry & Biochemistry, Thapar University, Patiala-147 004, India

*Corresponding author: E-mail: dhillonps2003@gmail.com

Abstract

Zirconium phosphoborate based heterogeneous membrane electrode has been used as a chemical sensor in aqueous medium. The membrane demonstrates sub-Nernstian response in the concentration range of 10-5 to 10-1 mol L-1 Ba(II) ions, with a slope of 20.7 mV decade-1. The designed sensor has a fast response time of 15 s and has a detection limit of 6.31 × 10-7 mol L-1 for Ba(II) ions. Effect of internal solution concentration on the slope of calibration curve was studied. The electrode was successfully used in partially non-aqueous medium. The proposed sensor shows good selectivity for Ba(II) ions with respect to rare earth metal and alkaline earth metal ions. The electrode does not show any change in response within pH range 3.5 to 9. The system was used successfully as an indicator electrode in potentiometric titration of Ba(II) ions with EDTA.

Keywords

Zirconium phosphoborate, Indicator electrode, Barium selective electrode, Potentiometric titration.

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