Effect of Membrane Composition and Thickness on the Behavior of Solid Contact Ion Selective Electrodes for Pb~(2+) Using a Diazadibenzo-18-crown-6 Ether as Ionophore

摘要

Several solid contact ion selective electrodes (SC-ISE) for Pb~(2+) based on a diazadibenzo-18-crown-6 ether as the ionophore were constructed with varying membrane composition and thicknesses in order to study the effect of those given variables on the potentiometric behavior of the sensor. Thus, the potentiometric response of the electrodes was investigated with changing content of ionophore, plasticizer, ion-exchanger as well as changing the pH of the sample solutions. The corresponding analytical figures of merit, i.e. slope, detection limit, linear range and potentiometric selectivity coefficient (k_(pot)), were determined.