Citation: YANG Cheng, SONG Cai-Qiao, ZHANG Ya-Qi, QU Yao. Determination of Concentration of Serum Potassium Ion Using All-Solid-State Potassium Ion Selective Electrode Based on Two-Dimensional Manganese Dioxide Nanosheet[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(5): 765-771. doi: 10.19756/j.issn.0253-3820.181704 shu

Determination of Concentration of Serum Potassium Ion Using All-Solid-State Potassium Ion Selective Electrode Based on Two-Dimensional Manganese Dioxide Nanosheet

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

Received Date: 7 November 2018
Revised Date: 21 February 2019

Fund Project: This work was supported by the Fundamental Research Funds for the Central Universities (Nos. DUT17LAB18,DUT15RC(3)064), the Scientific Research Foundation for Doctoral Research of Liaoning Province, China (No.201501167) and the Open Funds of the State Key Laboratory of Electroanalytical Chemistry (No.SKLEAC201604)

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 solid-state 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 1.0×10^-5-1.0×10^-2 mol/L, and the detection limit was 6.3×10^-6 mol/L. Rapid and accurate detection of serum potassium was achieved using this all-solid-states potassium ion selective electrode.
- Manganese dioxide nanosheets,
- Potassium ion selective electrode,
- All-solid-states selective electrode,
- Serum potassium concentration
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