Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Estimating the Relative Contribution of Organic Phosphorus to Organic Matters with Various Sources Flowing into a Reservoir Via Fluorescence Spectroscopy

형광스펙트럼을 이용한 유역 하류 저수지의 유입 유기물 내 유기인 기여도 평가

  • Received : 2023.10.27
  • Accepted : 2024.02.27
  • Published : 2024.03.30
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Abstract

The introduction of a significant amount of phosphorous into aquatic environments can lead to eutrophication, which can in turn result in algal blooms. For the effective management of watersheds and the prevention of water quality problems related to nonpoint organic matter (OM) sources, it is essential to pinpoint the predominant OM sources. Several potential OM sources were sampled from upper agricultural watersheds, such as fallen leaves, riparian reeds, riparian plants, paddy soil, field soil, riparian soil, cow manure, and swine manure. Stream samples were collected during two storm events, and the concentrations of dissolved organic carbon (DOC) and phosphorous (DOP) from these OM sources and stream samples were assessed. DOM indicators using fluorescence spectroscopy, including HIX, FI, BIX, and EEM-PARAFAC, were evaluated in terms of their relevance in discerning DOM sources during storm events. Representative DOM descriptors were chosen based on specific criteria, such as value ranges and pronounced differences between low and high-flow periods. Consequently, the spectral slope ratio (SR) paired with fluorescence index (FI) using end-member mixing analysis (EMMA) proved to be suitable for estimating the contribution of organic carbon (OC). The contribution of each organic phosphorous (OP) in stream samples was determined using the phosphorous-to-carbon (P/C) ratio in conjunction with the OC contribution. Notably, OP derived from swine manure in stream samples was found to make the most dominant contribution, ranging from 61.3% to 94.2% (average 78.1% ± 12.7%). The results of this research offer valuable insights into the selection of suitable indicators to recognize various OM sources and highlight the main sources of OP in forested-agricultural watersheds.

Keywords

Acknowledgement

본 연구는 2019년 K-water 연구원 위탁연구사업(과제명:댐 저수지 유기물 증가 원인 분석을 위한 오염원 기원 추적)과 2022년 해양수산부 해양수산과학기술진흥원 - 해양 유해물질 오염원 추적 기법 개발 사업(KIMST-20220534)의 지원을 받아 수행되었습니다.

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