Evaluation of CODsed Analytical Methods for Domestic Freshwater Sediments: Comparison of Reliability and Correlationship between CODMn and CODCr Methods

국내 담수퇴적물의 CODsed 분석방법 평가: CODMn법과 CODCr법의 신뢰성 및 상관성 비교

  • Choi, Jiyeon (Department of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University) ;
  • Oh, Sanghwa (Department of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University) ;
  • Park, Jeong-Hun (Department of Environment and Energy Engineering, Chonnam National University) ;
  • Hwang, Inseong (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Oh, Jeong-Eun (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Hur, Jin (Department of Environment and Energy, Sejong University) ;
  • Shin, Hyun-Sang (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Huh, In-Ae (National Institute of Environmental Research) ;
  • Kim, Young-Hoon (Department of Environmental Engineering, Andong National University) ;
  • Shin, Won Sik (Department of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University)
  • 최지연 (경북대학교 건설환경에너지공학부) ;
  • 오상화 (경북대학교 건설환경에너지공학부) ;
  • 박정훈 (전남대학교 환경에너지공학과) ;
  • 황인성 (부산대학교 사회환경시스템공학부) ;
  • 오정은 (부산대학교 사회환경시스템공학부) ;
  • 허진 (세종대학교 환경에너지융합학과) ;
  • 신현상 (서울과학기술대학교 환경공학과) ;
  • 허인애 (국립환경과학원) ;
  • 김영훈 (안동대학교 환경공학과) ;
  • 신원식 (경북대학교 건설환경에너지공학부)
  • Received : 2013.06.26
  • Accepted : 2013.11.15
  • Published : 2014.02.28


In Korea, the chemical oxygen demand($COD_{sed}$) in freshwater sediments has been measured by the potassium permanganate method used for marine sediment because of the absence of authorized analytical method. However, this method has not been fully verified for the freshwater sediment. Therefore, the use or modification of the potassium permanganate method or the development of the new $COD_{sed}$ analytical method may be necessary. In this study, two modified $COD_{sed}$ analytical methods such as the modified potassium permanganate method for $COD_{Mn}$ and the modified closed reflux method using potassium dichromate for $COD_{Cr}$ were compared. In the preliminary experiment to estimate the capability of the two oxidants for glucose oxidation, $COD_{Mn}$ and $COD_{Cr}$ were about 70% and 100% of theoretical oxygen demand(ThOD), respectively, indicating that $COD_{Cr}$ was very close to the ThOD. The effective titration ranges in $COD_{Mn}$ and $COD_{Cr}$ were 3.2 to 7.5 mL and 1.0 to 5.0 mL for glucose, 4.3 to 7.5 mL and 1.4 to 4.3 mL for lake sediment, and 2.5 to 5.8 mL and 3.6 to 4.5 mL for river sediment, respectively, within 10% errors. For estimating $COD_{sed}$ recovery(%) in glucose-spiked sediment after aging for 1 day, the mass balances of the $COD_{Mn}$ and $COD_{Cr}$ among glucose, sediments and glucose-spiked sediments were compared. The recoveries of $COD_{Mn}$ and $COD_{Cr}$ were 78% and 78% in glucose-spiked river sediments, 91% and 86% in glucose-spiked lake sediments, 97% and 104% in glucose-spiked sand, and 134% and 107% in glucose-spiked clay, respectively. In conclusion, both methods have high confidence levels in terms of analytical methodology but show significant different $COD_{sed}$ concentrations due to difference in the oxidation powers of the oxidants.


Supported by : 국립환경과학원


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