Citation: CUI Guang-Wen, HE Run-He, YAO Jian, WANG Jian-Ping, ZHANG Xing-Xiang. Preparation and Characterization of All-Solid-State Zinc Ion Selective Electrode[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(10): 1669-1676. doi: 10.11895/j.issn.0253-3820.181198 shu

Preparation and Characterization of All-Solid-State Zinc Ion Selective Electrode

Tianjin Key Laboratory of Advanced Fibers and Energy Storage, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China

Received Date: 25 March 2018
Revised Date: 1 August 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 51573135).

Zinc is an essential trace element in human body, and the amount of zinc intake will affect human health. Therefore, it is necessary to detect the content of zinc in food, medicine and environmental sewage precisely. In this work, polypyrrole microcapsules containing ZnCl₂ solution were coated between a glassy carbon electrode and zinc ion selective membrane as a solid-contact sensing layer to obtain an all-solid zinc ion selective membrane electrode (GC/PPy microcapsules/Zn²⁺-ISE). The electrode was characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that the polypyrrole microcapsules, used as intermediate layer, could significantly improve the electrode capacitance, lower the electrode charge transfer impedance, and effectively convert the signal between electrons and ions. The linear response range of electrode potential was 1.0×10^-5-1.0×10^-1 mol/L, and the detection limit was 2.45×10^-6 mol/L. In addition, the electrode using polypyrrole microcapsules as intermediate layer had good reproducibility and stability.
- Polypyrrole microcapsule,
- Zinc ion selective electrode,
- All-solid-state selective electrode,
- Detection of ion
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