Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Effects of Humic Substances on the Changes of Dissolved Organic Matter Characteristics by Biodegradation

생분해 과정 중 용존 유기물 특성 변화에 미치는 휴믹물질의 영향

  • Park, Min-Hye (Department of Earth and Environmental Sciences, Sejong University) ;
  • Lee, Bo-Mi (Department of Earth and Environmental Sciences, Sejong University) ;
  • Lee, Tae-Hwan (Department of Earth and Environmental Sciences, Sejong University) ;
  • Hur, Jin (Department of Earth and Environmental Sciences, Sejong University) ;
  • Yang, Hee-Jeong (Han-River Environment Research Center)
  • 박민혜 (세종대학교 지구환경과학과) ;
  • 이보미 (세종대학교 지구환경과학과) ;
  • 이태환 (세종대학교 지구환경과학과) ;
  • 허진 (세종대학교 지구환경과학과) ;
  • 양희정 (국립환경과학원 한강물환경연구소)
  • Received : 2008.12.31
  • Accepted : 2009.04.10
  • Published : 2009.05.30
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Abstract

Characteristics of humic substances on the changes in dissolved organic matter (DOM) characteristics by biodegradation was investigated using three types of the artificial water samples composed of glucose and Suwannee River fulvic acid (SRFA). Some selected DOM characteristics including the specific UV absorbance (SUVA), the synchronous fluorescence spectra and the molecular weight (MW) were compared for the artificial water samples before and after 28-day microbial incubation. The changes of the DOM characteristics were minimal for SRFA during the incubation whereas they were significant for glucose. SUVA, dissolved organic carbon (DOC)-normalized fluorescence intensity, and MW values of glucose increased, suggesting that such labile organic compounds could be exclusively transformed into more humidified materials by biodegradation. For glucose-SRFA mixture, the selected DOM characteristics were greater than those estimated using the assumption that the individual changes of either glucose or SRFA are conservative for the mixture of the two materials. Our results suggest that the presence of humic substances (HS) may lead to the enhancement of the formation of refractory organic materials during biodegradation of labile compounds. Detailed analyses of size exclusion chromatography (SEC) revealed that the enhancement occurred for the DOM mixture with a MW range between 500 Da to 4000 Da.

Keywords

Acknowledgement

Grant : 한강수계 난분해성 물질 증감요인 규명 및 관리방안 연구

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