Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Evaluation of the Possibility of Developing Organic Matter Indicators in Coastal Environments: Utilization of Dissolved Organic Carbon and Fluorescent Dissolved Organic Matter

연안환경에서 유기물 지표 개발을 위한 가능성 평가: 용존유기탄소와 형광용존유기물질 활용

  • Lee, Min-Young (Faculty of Earth System and Environmental Sciences, College of Natural Sciences, Chonnam National University) ;
  • Yang, Kyungsun (Faculty of Earth System and Environmental Sciences, College of Natural Sciences, Chonnam National University) ;
  • Kim, Sunchan (Jeju Special Self-Governing Province Ocean and Fisheries Research Institute) ;
  • Kim, Tae-Hoon (Faculty of Earth System and Environmental Sciences, College of Natural Sciences, Chonnam National University)
  • 이민영 (전남대학교 자연과학대학 지구환경과학부) ;
  • 양경선 (전남대학교 자연과학대학 지구환경과학부) ;
  • 김순찬 (제주특별자치도 해양수산연구원) ;
  • 김태훈 (전남대학교 자연과학대학 지구환경과학부)
  • Received : 2021.04.21
  • Accepted : 2021.06.03
  • Published : 2021.06.30
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Abstract

In order to evaluate the dissolved organic carbon (DOC) and fluorescent dissolved organic matter (FDOM), as indicators of organic matter in the coastal environments, we measured the concentrations of DOC, FDOM, and chemical oxygen demand (COD) in saline groundwater (Woljeong, Pyoseon, and Hwasun beaches) and coastal seawater (Haengwon, Gwideok, Pyoseon, and Yeongnak) in Jeju, Korea. The highest concentrations of DOC and COD in groundwater were found in Woljeong and Pyoseon, and those in coastal water were observed in Haengwon and Pyoseon, indicating that the higher concentrations of DOC and COD seem to be associated with saline groundwater-driven dissolved organic matter (DOM) and/or biogeochemical processes. According to origin and optical properties of DOM using FDOM as a tracer, proportion of humic-like FDOM, more refractory DOM, was relatively greater in the groundwater than in the coastal water. With regard to this result, there was no relationship between DOC and COD in groundwater, while DOC showed a good positive correlation (r2 = 0.66) with COD in coastal water. This result indicates that COD as an indicator of assessment of DOM has a limitation in which it is difficult to quantify refractory DOM. Although DOC is a potential alternative to COD in the coastal environments, particulate organic carbon cannot be negligible due to relatively higher concentration compared to the open ocean. Therefore, the use of total organic carbon (TOC) as a replacement of COD in the coastal ocean is important, and the evaluation criterion of the TOC is necessary in order to evaluate of organic matter indicator in the various coastal environments.

Keywords

Acknowledgement

이 논문은 2021년 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구입니다(전남씨그랜트).

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