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The Determination of TRC using an Electrochemical Method (II: Pt electrode)

전기화학적 방법의 TRC(Total residual chlorine) 측정 연구(II: Pt전극 이용)

  • Lee, JunCheol (Graduate School of Energy and Environment, Seoul National University of Science & Technology) ;
  • Pak, DaeWon (Graduate School of Energy and Environment, Seoul National University of Science & Technology)
  • 이준철 (서울과학기술대학교 에너지환경대학원) ;
  • 박대원 (서울과학기술대학교 에너지환경대학원)
  • Received : 2014.02.14
  • Accepted : 2014.04.21
  • Published : 2014.05.30

Abstract

The conventional methods for total residual chlorine such as iodometry and DPD colorimetric can cause secondary pollution due to additional agents, also have a wide error range. As for alternative, electrochemical method can measure TRC(Total residual chlorine), and is not required as additional agents, also very suitable for using the fields of ballast water because test time is relatively fast. Therefore, this study was investigated for changing charge by agitation, salt concentration, and temperature change. Charge showed differences based on changes of reduction peak with or without agitation. In contrast, TRC and charge were well correlated in constant agitation speed. As TRC and charge were analyzed with high correlations in constant salinity and temperature of ocean, thereby conductivity was firstly measured, and charge had high correlation for TRC in spite of changing salinity and temperature Pt electrode revealed high reliability ($r^2=0.960$) because it was rarely effected by TRC, On the other hand, Au electrode appeared inadequate ($r^2=0.767$) to use sensor in less than 1.0 ppm of TRC. For high accuracy and detection of TRC, Pt and Au electrodes for test time were, respectively, 14 and 22 seconds. As a result, Pt electrode was more valuable than Au electrode in terms of response time.

Acknowledgement

Supported by : 서울과학기술대학교

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