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DEVELOPMENT OF A LIQUID JUNCTION-FREE REFERENCE ELECTRODE SYSTEM BY APPLICATION OF CLOSED BIPOLAR ELECTRODE(cBPE)

Siti Masturah Fakhruddin1Kumi Y.Inoue1Tomokazu Matsue1Hitoshi Shiku2

1. Graduate School of Environmental Studies,Tohoku University2. Graduate School of Engineering,Tohoku University

摘要:INTRODUCTION In most electroanalytical techniques,a reference electrode(RE) is usually employed. In a RE,porous membranes,glass frits,or other forms of liquid junctions are used to provide ionic conductance between the sample and the reference electrolyte. However,liquid junctions induce ion leakage and sample contamination. Therefore,we propose a RE system that employs the closed bipolar electrode(cBPE),thus eliminating the need for a liquid junction. This was obtained by physically separating the RE from the sample cell. Instead of ionic transport through the liquid junction between the RE and the sample solution,it was replaced with electron transport through the bipolar electrode,thus completing the cell circuit and eliminating the need for the liquid junction. In this study,we characterized the cBPE reference system and proved the reference potential-determining mechanism.METHODS The reference cell is segregated from the sample cell,and the two cells are connected through electron transport provided by the cBPE,as illustrated in Fig. 1. The reference potential-determining mechanism of the cBPE system was predicted to be according to Kirchhoff’s Voltage Law:ΔEsystem = ΔEsample +ΔEbp + ΔEinner,where ΔEsystem is the applied potential between the RE and the working electrode. ΔEbp,ΔEinner,and ΔEsample are the potential difference between the two poles of the BPE,RE and BPE pole in the reference cell,working electrode and the BPE pole in the sample cell,respectively. Cyclic voltammetry study was carried out with scan rate 20 m V/s putting 1.0 m M to 0.03125 m M ferrocenemethanol(FMA) and mixture solution of 5.0 mM ferrocyanide/ferricyanide in the sample cell.RESULTS The cBPE reference system successfully detected 1.0 m M to 0.03125 m M FMA with cyclic voltammetry,as obtained using the conventional three-electrode system. Using ferrocyanide/ferricyanide mixture solution as sample,the reference potential was revealed to shift according to the changes in electrode potential on BPE pole in the sample cell(Fig. 2). The results show good accordance to Kirchhoff’s Voltage Law. By using a non-polarizable electrode(i.e. Ag) as BPEsample,or measuring in a constant sample composition,the cBPE reference system can be employed like the conventional three-electrode system.CONCLUSIONS A liquid junction-free reference electrode system that employs a c BPE was fabricated. The reference potential-determining mechanism was proven to be based on Kirchhoff’s Voltage Law. Quantitative measurement of FMA was successfully carried out using the constructed sensing system. Additional research will include modification of the detection electrode to allow sensing of biological analytes that are easily affected by sample cross-contamination.
会议名称:

中国化学会第十二届全国微全分析系统学术会议、第七届全国微纳尺度生物分离分析学术会议、第七届国际微流控学学术论坛、The 11th International Symposium on Microchemistry and Microsystems

会议时间:

2019-05-17

会议地点:

中国陕西西安

  • 专辑:

    工程科技Ⅰ辑

  • 专题:

    化学

  • DOI:

    10.26914/c.cnkihy.2019.085655

  • 分类号:

    O657.1

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