The application of a potentiometric pH electrode in ocean acidification observation is still a challenge due to its poor sensitivity to small pH changes. Herein, a simple approach to remarkably improve the detection precision of a polymeric membrane ion-selective electrode is proposed based on the potential-modulated ion transfer mechanism. The present sensing strategy displays highly sensitive responses to small pH changes for seawater analysis with a precision of 5 μpH, which is 2 orders of magnitude lower than that of the conventional pH electrode.
A simple approach to improve the precision of potentiometric sensors is proposed based on potential-modulated ion transfer without memory effects.
Liu L., Liu Y., Jiang T., Liang R. & Qin W., 2024. Polymeric membrane ion-selective electrode based on potential-modulated ion transfer: ultrasensitive measurement of oceanic pH. Chemical Communications 60(91): 13404-13407. Article.
