Cyclic Trimeric Perfluoro‐o‐Phenylenemercury as a New Ionophore for Quaternary Ammonium Cation‐Selective Membrane Electrode

Abstract

A novel PVC membrane quaternary ammonium cation‐selective electrode has been prepared by using cyclic trimeric perfluoro‐o‐phenylenemercury [(o‐C₆F₄Hg)₃] as an ionophore and DOS as a plasticizer. A small amount of KTpClPB was added as an anion additive. The best performance of the electrode was observed with the composition: [(o‐C₆F₄Hg)₃]∶DOS∶PVC∶KTpClPB = 1.0∶65.7∶33.2∶0.1 (wt%), which works well over a wide concentration range of 10⁻⁵ ∼ 10⁻¹ mol · dm⁻³ for Bu₄N⁺ and Me₄N⁺. The corresponding slopes are 60.3 and 57.5 mV/decade, respectively. The selectivity, the lifetime, and the influence of pH have also been studied. The proposed electrode has been successfully used for the determination of propantheline ion in propantheline bromide and methadone in human urine. The possible mechanism of cationic response of the electrode was discussed.

The authors are grateful to the National Natural Science Foundation of China (29872034) and Russian Foundation for Basic Research (02‐03‐33304) for financial support of this work.

Keywords:

• Cyclic trimeric perfluoro‐o‐phenylenemercury
• quaternary ammonium cation‐selective electrode
• PVC membrane

Notes

The authors are grateful to the National Natural Science Foundation of China (29872034) and Russian Foundation for Basic Research (02‐03‐33304) for financial support of this work.