Terbium(III) Ion-Selective Electrochemical Sensor Based on Hematoporphyrin

Abstract

A polyvinyl chloride (PVC) based membrane sensor for terbium ions was prepared by employing Hematoporphyrin (HP) as an ionophore. The sensor revealed a very good selectivity (expect for the Fe³⁺ion) with respect to common alkali, alkaline earth and heavy metal ions. The plasticized membrane electrode exhibits a Nernstian response for Tb³⁺ ions over a wide concentration range (1.0 × 10⁻⁶ − 1.0 × 10⁻² M) with a slope of 19.8±0.3 mV per decade and low detection limit of 7.4 × 10⁻⁷ M. The developed sensor was used in determination of F⁻ in mouth wash preparation sample.

Keywords:

• Ion-selective electrode
• Potentiometry
• PVC membrane
• Sensor
• Terbium (III)

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

Notes

^a Proposed Tb³⁺ sensor.

^b Results are based on three measurements.

^aResults are based on three measurements