Citation: LI Yuying, DAI Xin, HE Chunxiang. Design and Application of All Solid State Acidity Microelectrode Set[J]. Chinese Journal of Applied Chemistry, ;2019, 36(6): 711-716. doi: 10.11944/j.issn.1000-0518.2019.06.180320 shu

Design and Application of All Solid State Acidity Microelectrode Set

School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China

Corresponding author: HE Chunxiang, hcx0224@lnnu.edu.cn
Received Date: 9 September 2018
Revised Date: 11 December 2018
Accepted Date: 18 January 2019

Fund Project: Supported by the National Natural Science Foudaiton of China(No.U1610114)the National Natural Science Foudaiton of China U1610114

Figures(8)

A micro-luteolin carbon fiber acidity microelectrode(Lu/CFME) was made with luteolin as a pH sensitive substance, carbon fiber as conductive matrix and solid paraffin as a binder. An all solid state acidity microelectrode set was combinated by Lu/CFME as working electrode, a self-made conductive gel type all-solid micro Ag/AgCl as reference electrode and a platinum wire microelectrode as auxiliary electrode. The response of the electrode set to the effective acidity was studied in the solution of phosphate buffer solution at pH 2.00~10.00 by cyclic voltammetry. The results show that there is a pair of reversible redox peaks on the cyclic voltammetry curve. Their peak potentials(E_pa) were all linear with pH. Based on this, a method for determining the acidity of solution was established by square wave voltammetry, and the linear regression equation for peak potential of oxidation peak and pH is E_pa(V)=-0.0567pH+0.603(r=0.999). The electrode set is micro, non-toxic and anti-interference. It is applied to acidity measurement of trace saliva and sweat on the skin surface, and satisfactory results have been obtained. Therefore, this result provides a technical basis for real-time, in-vivo detection of body fluids.
- luteolin modified acidity microelectrode,
- micro Ag/AgCl reference electrode,
- all solid,
- square wave voltammetry
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