On the static and dynamic selectivity study of a sodium sensor

This paper describes the measurement of selectivity coefficients of a potentiometric sodium sensor based on a ceramic membrane and its response to interfering ions. An acquisition subsystem is realized around the 68MC701. Microcontroller to drive the analog part which multiplexes four channels at high input impedance (more than 1000 GΩ). The system is used for data acquisitions from ions sensors with different realizations. The output voltages are plotted against time to show the evolution of the output signals for different interfering ions (Potassium, Calcium, and Lithium). Hence, four sensors with membranes sintered at 900, 1000, 1150, and 1200°C have been characterized. An experimental setup has been realized and adapted to the subsystem to study the transient interferences. Experimental results are given to show the effect of disturbance in the static and dynamic cases