Novel usage of perinone polymer as solid contact in ion-selective electrodes

Abstract

The paper presents the use of a new perinone polymer (PPer) as an intermediate layer and the development of a new type of potassium ion-selective electrodes with solid contact. The PPer layer was applied to the surface of a glassy carbon electrode using potentiodynamic polymerization from an electrolyte solution containing perinone precursors (Per). Subsequently, the surface of the electrode after application of the polymer was examined using a microscope and an optical profilometer. To check the quality of the prepared ion-selective electrodes, a series of tests were carried out and the analytical and electrical parameters of the electrodes were determined. Electrode modifications using PPer improved the electrode parameters, especially the stability and reversibility of the potential, compared to the control electrode covered only with an ion-sensitive membrane. The best electrode was the electrode modified with PPer applied in 10 cycles, which, as a result of the modification, allowed better parameters to be obtained – slope 58.86mV/decade, LOD 1.2×10-6M, linearity range 5×10-6 – 1×10-1M. A very low short-term potential drift value of 2.7×10-4mV/s was obtained as well as an extremely satisfactory SD value of 1.1mV from E0 measurements. The modification also improved electrical properties and gave a negative result of the water layer test.