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Date of Publication:2019-01-01

Journal:分析化学

Affiliation of Author(s):化工学院

Volume:47

Issue:05

Page Number:765-771

ISSN No.:0253-3820

Abstract:Potassium is an indispensable element of the human body. The disorder of potassium concentration is one of the most common electrolyte disorders in the clinic. The imbalance of potassium concentration makes the myocardial contraction ability abnormal , causing arrhythmia, leading to shock and even death. Therefore , real-time and accurate detection of blood potassium is extremely important for saving lives. In this paper, a 2D MnO2 nanosheet was used as an ion-electron conversion layer ( solid contact layer) to construct an all solidstate Potassium ion selective electrode whose membrane based on a glassy carbon electrode and a polymer membrane containing valinomycin as an ionophore. The results showed that MnO2 nanosheets had the characteristics of rapid charge and discharge, and their use as ion-electron transducing layers could effectively improve the ion-electron conversion efficiency and reduce the resistance of potassium ion selective electrodes in water layer testing and anti-interference experiments. It exhibited good performance and improved electrode potential response speed and stability. The linear response range of the all-solid potassium ion selective electrode was 1.0 x 10(-5) -1.0 x 10(-2) mol/L, and the detection limit was 6. 3 x 10(-6) mol/L. Rapid and accurate detection of serum potassium was achieved using this all-solid-states potassium ion selective electrode.

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