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Introduction of a New Method for Total Organic Carbon and Total Nitrogen Stable Isotope Analysis of Dissolved Organic Matter in Aquatic Environments

수환경 내 용존성 유기물질의 총 유기탄소 및 총 질소 안정동위원소 신규 분석법 소개

  • Si-yeong Park (Environmental Measurement and Analysis Center, National Institute of Environmental Research) ;
  • Heeju Choi (Global Testing and Certification Center, Testing Laboratory) ;
  • Seoyeon Hong (Environmental Measurement and Analysis Center, National Institute of Environmental Research) ;
  • Bo Ra Lim (Environmental Measurement and Analysis Center, National Institute of Environmental Research) ;
  • Seoyeong Choi (Department of Environmental Science, Kongju National University) ;
  • Eun-Mi Kim (Environmental Measurement and Analysis Center, National Institute of Environmental Research) ;
  • Yujeong Huh (Environmental Measurement and Analysis Center, National Institute of Environmental Research) ;
  • Soohyung Lee (Fundamental Environmental Research Department, National Institute of Environmental Research) ;
  • Min-Seob Kim (Environmental Measurement and Analysis Center, National Institute of Environmental Research)
  • 박시영 (국립환경과학원 환경기반연구부 환경측정분석센터) ;
  • 최희주 (한국산업기술시험원 디지털산업본부 글로벌 시험인증센터) ;
  • 홍서연 (국립환경과학원 환경기반연구부 환경측정분석센터) ;
  • 임보라 (국립환경과학원 환경기반연구부 환경측정분석센터) ;
  • 최서영 (공주대학교 환경과학부) ;
  • 김은미 (국립환경과학원 환경기반연구부 환경측정분석센터) ;
  • 허유정 (국립환경과학원 환경기반연구부 환경측정분석센터) ;
  • 이수형 (국립환경과학원 환경기반연구부) ;
  • 김민섭 (국립환경과학원 환경기반연구부 환경측정분석센터)
  • Received : 2023.10.23
  • Accepted : 2023.10.26
  • Published : 2023.12.31

Abstract

Dissolved organic matter (DOM) is a key component in the biogeochemical cycling in freshwater ecosystem. However, it has been rarely explored, particularly complex river watershed dominated by natural and anthropogenic sources, such as various effluent facility and livestock. The current research developed a new analytical method for TOC/TN (Total Organic Carbon/Total Nitrogen) stable isotope ratio, and distinguish DOM source using stable isotope value (δ13C-DOC) and spectroscopic indices (fluorescence index [FI] and biological index [BIX]). The TOC/TN-IR/MS analytical system was optimized and precision and accuracy were secured using two international standards (IAEA-600 Caffein, IAEA-CH-6 Sucrose). As a result of controlling the instrumental conditions to enable TOC stable isotope analysis even in low-concentration environmental samples (<1 mgC L-1), the minimum detection limit was improved. The 12 potential DOM source were collected from watershed, which includes top-soils, groundwater, plant group (fallen leaves, riparian plants, suspended algae) and effluent group (pig and cow livestock, agricultural land, urban, industry facility, swine facility and wastewater treatment facilities). As a result of comparing characteristics between 12 sources using spectroscopic indices and δ13C-DOC values, it were divided into four groups according to their characteristics as a respective DOM sources. The current study established the TOC/TN stable isotope analyses system for the first time in Korea, and found that spectroscopic indices and δ13C-DOC are very useful tool to trace the origin of organic matter in the aquatic environments through library database.

본 연구는 TOC/TN-IRMS를 이용하여 총 유기탄소 및 총 질소 안정동위원소 분석법을 연구하였으며, 수환경 중저농도 시료에서도 분석이 가능하게 시스템을 구축하였다. 수생태계로 유입되는 다양한 유기탄소 기원을 파악하기 위하여 형광지표와 δ13C-DOC 안정동위원소비를 활용한다면 효율적인 수질 관리를 위한 해석기능을 제공할 것이며, 추후 유역 오염원의 대표값(end member)의 지속적인 조사를 통하여 자료구축이 이루어져야 할 것이다.

Keywords

Acknowledgement

본 연구는 2023년 환경부 국립환경과학원 "제2단계('19~'23) 환경다매체 오염원 추적자 탐색 및 현장 적용기법 연구(2023-01-01-117)"에서 수행되었습니다.

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