In this paper we propose a dynamic way to measure the buffer capacity of an electrolyte by means of an ISFET-based coulometric sensor-actuator system whose gate is covered with a porous actuator. A theoterical model for this measurement is presented. Experiments are carried out in nitric and acetic acid as well as in phosphoric acid solutions. A fairly good agreement has been found between the theoretical calculations and the experimental results.
Luo, J., Luo, J., Olthuis, W., Bergveld, P., Bos, M., & van der Linden, W. E. (1994). Determination of buffer capacity by means of an ISFET-based coulometric sensor-actuator system with a gate-covering porous actuator. Sensors and actuators. B: Chemical, 20(1), 7-15. https://doi.org/10.1016/0925-4005(93)01170-9