Analytical Sciences

Development of Electrochemical Oxygen Demand Measurement Cells Using a Diamond Electrode

Takeshi KONDO,*1,*2 Masaki HOSHINO,*1 Takeshi WATANABE,*3 Tatsuo AIKAWA,*1 Makoto YUASA,*1,*2 and Yasuaki EINAGA*3,*4

*1 Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
*2 Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
*3 Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan
*4 JST ACCEL, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan

Electrolytic cells for electrochemical oxygen demand (ECOD) measurements based on total electrolytic decomposition at a boron-doped diamond (BDD) electrode were developed for rapid measurement of organic pollutants at low concentrations. Using improved electrolytic cells designed for efficient mass transfer, the ECOD for 10 μM potassium hydrogen phthalate (theoretical ECOD: 2.3 mg-O₂ L^–1) was determined in a relatively short electrolysis time. Thus, ECOD measurements using these cells would be useful for estimating organic water pollution in industrial waste and lake water.

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