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Issue 12, 2007
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Performance of an electrochemical COD (chemical oxygen demand) sensor with an electrode-surface grinding unit

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Abstract

An electrochemical COD (chemical oxygen demand) sensor using an electrode-surface grinding unit was investigated. The electrolyzing (oxidizing) action of copper on an organic species was used as the basis of the COD measuring sensor. Using a simple three-electrode cell and a surface grinding unit, the organic species is activated by the catalytic action of copper and oxidized at a working electrode, poised at a positive potential. When synthetic wastewater was fed into the system, the measured Coulombic yields were found to be dependent on the COD of the synthetic wastewater. A linear correlation between the Coulombic yields and the COD of the synthetic wastewater was established (10–1000 mg L−1) when the electrode-surface grinding procedure was activated briefly at 8 h intervals. When various kinds of wastewater samples obtained from various sewage treatment plants were measured, linear correlations (r2 ≥ 0.92) between the measured EOD (electrochemical oxygen demand) value and COD of the samples were observed. At a practical wastewater treatment plant, the measurement system was successfully operated with high accuracy and good stability over 3 months. These experimental results show that the application of the measurement system would be a rapid and practical method for the determination of COD in water industries.

Graphical abstract: Performance of an electrochemical COD (chemical oxygen demand) sensor with an electrode-surface grinding unit

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Article information


Submitted
31 Aug 2007
Accepted
09 Oct 2007
First published
23 Oct 2007

J. Environ. Monit., 2007,9, 1352-1357
Article type
Paper

Performance of an electrochemical COD (chemical oxygen demand) sensor with an electrode-surface grinding unit

B. Geun Jeong, S. Min Yoon, C. Ho Choi, K. Koang Kwon, M. Sik Hyun, D. Heui Yi, H. Soo Park, M. Kim and H. Joo Kim, J. Environ. Monit., 2007, 9, 1352
DOI: 10.1039/B713393F

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