Lead Ion‐Selective Membrane Electrode Based on a Novel Fluorene Derivative

Abstract

A novel fluorine derivative 4,5‐diaza‐9‐(4‐methylphenyl) imino fluorene has been synthesized and evaluated as a lead (II) ion‐selective ionophore in PVC membrane electrode. The influence of the nature of the plasticizers (o‐NPOE, DBP, and DOS) and of the amount of incorporated ionophore and KTpClPB on the characteristics of the electrode were discussed. The electrode prepared with 5.7 mg ionophore, 187 mg o‐NPOE, 92 mg PVC, and 0.11 mg KTpClPB gave a good Nernstian response of 28.8 mV/decade for lead (II) in the concentration range 1.0 × 10⁻⁶–1.0 × 10⁻² mol dm⁻³. The limit of detection reached 1.0 × 10⁻⁷ mol dm⁻³. The electrode showed high selectivity toward lead over alkali, alkaline earth, and some transition metal ions. The influence of pH has been studied. The electrode exhibited better potential stability and reproducibility. The electrode was used to determine lead levels in polluted water using the developed electrode.

Keywords:

• 4,5‐Diaza‐9‐(4‐methylphenyl) imino fluorene
• Lead ion‐selective electrode
• PVC membrane

Acknowledgments

We acknowledge the financial support from Core Youth Teacher Science Foundation of Zhengzhou University.