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http://dx.doi.org/10.7735/ksmte.2012.21.4.575

Effectiveness of the Sensor using Lead Dioxide Electrodes for the Electrochemical Oxygen Demand  

Kim, Hong-Won (숭실대학교 대학원 기계공학과)
Chung, Nam-Yong (숭실대학교 공과대학 기계공학과)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.21, no.4, 2012 , pp. 575-581 More about this Journal
Abstract
The electrochemical oxygen demand (ECOD) is an additional sum parameter, which has not yet found the attention it deserves. It is defined as the oxygen equivalent of the charge consumed during an electrochemical oxidation of the solution. Only one company has yet developed an instrument to determine the ECOD. This instrument uses $PbO_2$-electrodes for the oxidation and has been successfully implemented in an automatic on-line monitor. A general problem of the ECOD determination is the high overpotential of electrochemical oxidations of most organic compounds at conventional electrodes. Here we present a new approach for the ECOD determination, which is based on the use of a solid composite electrodes with highly efficient electro-catalysts for the oxidation of a broad spectrum of different organic compounds. Lead dioxide as an anode material has found commercial application in processes such as the manufacture of sodium per chlorate and chromium regeneration where adsorbed hydroxyl radicals from the electro-oxidation of water are believed to serve as the oxidizing agent. The ECOD sensors based on the Au/$PbO_2$ electrode were operated at an optimized applied potential, +1.6 V vs. Ag/AgCl/sat. KCl, in 0.01 M $Na_2SO_4$ solution, and reduced the effect of interference ($Cl^-$ and $Fe^{2-}$) and an expended lifetime (more than 6 months). The ECOD sensors were installed in on-line auto-analyzers, and used to analyze real samples.
Keywords
Chemical Oxygen Demand; Electrochemical COD Sensor; Tree Electrode System; Lead Dioxide Sensor; Response Curve;
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1 Jiaqing, L., Luoping, L., Lei, Z., Yuezhong, X., Shiyun, A., and Litong J., 2005, "Amperometric Determination of Chemical Oxygen Demand(COD) with Flow Injection Analysis using F-$PbO_{2}$ Modified Electrode," Analytica Chimica Acta, Vol. 548, No. 1-2, pp. 199-204.   DOI   ScienceOn
2 Yeo, I. H., and Dennis, C. J., 2001, "Electrochemical Response of Small Organic Molecules at Nickel-Copper Alloy Electrodes," J. Electroanal. Chem., Vol. 495, No. 2, pp. 110-119.   DOI   ScienceOn
3 Grimm, J., Bessarabov, D., Maier, W., Storck, S., and Sanderson, R. D., 1998, "Sol-gel Film-preparation of Novel Electrodes for the Electrocatalytic Oxidation of Organic Pollutants in Water," Desalination, Vol. 115, No. 3, pp. 295-302.   DOI   ScienceOn
4 Livia, N., Geza, N., and Peter, H., 2001, "Copper Electrode based Amperometric Detector Cell for Sugar and Organic," Sensors and Actuators B, Vol. 76, No. 1-3, pp. 494-499.   DOI   ScienceOn
5 Feng, Y. J., and Li, X. Y., 2003, "Electro-catalytic Oxidation of Phenol on Several Metal-oxide Electrodes in Aqueous Solution," Water Research, Vol. 37, No. 10, pp. 2399-2407.   DOI   ScienceOn
6 Balconi, M. L., Borgarello, M., Ferraroli, R., and Realini, F., 1992, "Chemical Oxygen Demand Determination in Well and River Waters by Flow-injection Analysis using a Microwave oven during the Oxidation Step," Anal. Chim. Acta, Vol. 261, No. 1, pp. 295-299.   DOI   ScienceOn
7 Thompson, K. C., Mendham, D., Best, D., and Casseres, K. E., 1986, "Communication Simple Method for Minimising the Effect of Chloride on the Chemical Oxygen Demand Test without the use of Mercury Salts," Analyst, Vol. 111, pp. 483-485.   DOI
8 Ballinger, D., Lloyd, A., and Marrish, A., 1982, "Determination of Chemical Oxygen Demand of Wastewaters Without the use of Mercury Salts," Analyst, Vol. 107, pp. 1047-1053.   DOI
9 Reeve, R. N., 2002, Introduction to Environmental Analysis, John Wiley & Sons, New York.
10 Biswas, A. K., 1997, Water Resources: Environmental Planning, Management and Development, Mc Graw- Hill Professional Publishing, New York.
11 Korea, Environmental Laws, Ministry of Environment, 2006, Water Quality and Ecosystem Conservation Act.
12 Hejzlar, J., and Kopacek, J., 1990, "Determination of Low Chemical Oxygen Demand Values in Water by the Dichromate Semi-micro method," Analyst, Vol. 115, pp. 1463-1467.   DOI
13 Belkin, S., Brenner, A., and Abeliovich, A., 1992, "Effect of Inorganic Constituents on Chemical Oxygen Demand-II. Organic Carbon to Halogen Ratios Determine Halogen Interference," Water Res., Vol. 26, No. 12, pp. 1583-1588.   DOI   ScienceOn
14 Lloyd, A., 1982, "Simplified Procedure for the Determination of Chemical Oxygen Demand using Silver Nitrate to Suppress Chloride Interference," Analyst, Vol. 107, pp. 1316-1319.   DOI
15 Eduards, S. J., and Allen, M., 1984, "Rapid and Precise Method for the Determination of the Chemical Oxygen Demand of Factory Effluent Samples," Analyst, Vol. 109, pp. 671-672.   DOI
16 APHA, AWWA, WPCF, 1998, Standard Methods for the Examination of Water and Wastewater, 20th Ed. Washington, D. C.
17 Pasco, N., Baronian, K., Jeffries, C., and Hay, J., 2000, "Biochemical Mediator Demand-a Novel Rapid Alternative for Measuring Biochemical Oxygen Demand," Appl. Microbiol. Biot., Vol. 53, No. 5, pp. 613-618.   DOI
18 Charef, A., Ghauch, A., Baussand, P., and Martin- Bouyer, M., 2000, "Water Quality Monitoring using a Smart Sensing System," Measurement, Vol. 28, No. 3, pp. 219-224.   DOI   ScienceOn
19 Korea, Environmental Laws, Ministry of Environment, 2006, Enforcement Decree of the Water Quality and Ecosystem Conservation Act, Article 38. Section 2 to section 5.
20 Korea, Environmental Laws, Ministry of Environment, 2005, Standard Methods for the Examination of Water Pollution, Article 8.
21 Scriber, L. L., and Taylor, S. R., 1990, The Measurement and Correction of Electrolyte Resistance in Electrochemical Tests, ASTM Publication STP, Philadelphia.