Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Changes in Dissolved Organic Matter Composition in the Namhan River during a Heavy Rain Event

집중 강우시 남한강 내 용존 유기물의 성상 변화

  • Oh, Seijin (Department of Environmental Engineering, Seoul National University of Technology) ;
  • Woo, Sungho (Department of Environmental Engineering, Seoul National University of Technology) ;
  • Hur, Jin (Department of Earth and Environmental Science, Sejong University) ;
  • Jung, Myung-Sook (Han-river Environment Research Laboratory) ;
  • Shin, Hyun-Sang (Department of Environmental Engineering, Seoul National University of Technology)
  • 오세진 (서울산업대학교 환경공학과) ;
  • 우성호 (서울산업대학교 환경공학과) ;
  • 허진 (세종대학교 지구환경과학과) ;
  • 정명숙 (국립환경과학원 한강물환경연구소) ;
  • 신현상 (서울산업대학교 환경공학과)
  • Received : 2009.05.01
  • Accepted : 2009.07.03
  • Published : 2009.09.30
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Abstract

In this study, changes in the composition of dissolved organic carbon (DOC) were investigated using water samples collected at a downstream site of the Namhan River near the Lake Paldang ($N37^{\circ}24^{\prime}05.33^{{\prime}{\prime}}E127^{\circ}32^{\prime}25.01^{{\prime}{\prime}}$) during a heavy rain event from July 23 to July 28, 2008. The DOC concentrations varied from 1.68 to 3.18 mg/L with the maxium value at a peak of the river water level. Each DOC sample was fractionated into three compositions including hydrophilic (Hi), hydrophobic acid (HoA) and hydrophobic neutral (HoN) fractions. The results showed that HoA was most abundant fractions, constituting 47.2~56.5% of DOC. Refractory dissolved organic carbon (R-DOC) contents were also determined by measuring the DOC concentration after 28-day dark incubation of the samples. R-DOC content was in the range from 83 to 99% of DOC and it was significantly correlated with HoA contents (r = 0.91, p<0.005), while it did not exhibit such a good correlation with the fractions of Hi and HoN (p>0.02). Our results suggest that the HoA, which is associated with humic substances, may be a major composition of refractory organic matters in rivers during storm events.

Keywords

References

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