전기화학적 산소요구량 측정용 이산화납 전극 센서의 유효성Effectiveness of the Sensor using Lead Dioxide Electrodes for the Electrochemical Oxygen Demand
- Other Titles
- Effectiveness of the Sensor using Lead Dioxide Electrodes for the Electrochemical Oxygen Demand
- Authors
- 김홍원; 정남용
- Issue Date
- Aug-2012
- Publisher
- 한국생산제조학회
- Keywords
- 화학적 산소요구량; 전기화학적 산소요구량 센서; 3 전극계; 이산화납 센서; 감응 곡선; Chemical Oxygen Demand; Electrochemical COD Sensor; Tree Electrode System; Lead Dioxide Sensor; Response Curve
- Citation
- 한국생산제조학회지, v.21, no.4, pp.575 - 581
- Journal Title
- 한국생산제조학회지
- Volume
- 21
- Number
- 4
- Start Page
- 575
- End Page
- 581
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/12963
- DOI
- 10.7735/ksmte.2012.21.4.575
- ISSN
- 2508-5093
- 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 PbO2-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/PbO2 electrode were operated at an optimized applied potential, +1.6 V vs. Ag/AgCl/sat. KCl, in 0.01 M Na2SO4 solution, and reduced the effect of interference (Cl- and Fe2-)and an expended lifetime (more than 6 months). The ECOD sensors were installed in on-line auto-analyzers, and used to analyze real samples.
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