On the static and dynamic selectivity study of a sodium sensor

This paper describes the measurement of selectivity coefficients of a poten tiometric sodium sensor based on a ceramic membrane and its response to int erfering ions, An acquisition subsystem is realized around the 68MC701 micr ocontroller to drive the analog part which multiplexes four channels at hig h input impedance (more than 1000 G Omega). The system is used for data acq uisitions from ions sensors with different realizations, The output voltage s are plotted against time to show the evolution of the output signals for different interfering ions (Potassium, Calcium, and Lithium). Hence, four s ensors with membranes sintered at 900, 1000, 1150, and 1200 degrees C have been characterized. An experimental setup has been realized and adapted to the subsystem to study the transient interferences, Experimental results ar e given to show the effect of disturbance in the static and dynamic cases.