Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Distribution of Organic Matter and Heavy Metals in the Surface Sediments from Fishery Resources Protection Areas in the Southwestern Coast of Korea

남서해연안 수산자원보호구역 표층 퇴적물 중 유기물 및 중금속 농도분포

  • Koo, Jun-Ho (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Lee, Garam (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Hwang, Hyunjin (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Kim, Jeong-Bae (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Kim, Sang-Su (South Sea Fisheries Research Institute) ;
  • Hwang, Dong-Woon (Marine Environment Research Division, National Institute of Fisheries Science)
  • 구준호 (국립수산과학원 어장환경과) ;
  • 이가람 (국립수산과학원 어장환경과) ;
  • 황현진 (국립수산과학원 어장환경과) ;
  • 김정배 (국립수산과학원 어장환경과) ;
  • 김상수 (국립수산과학원 남해수산연구소) ;
  • 황동운 (국립수산과학원 어장환경과)
  • Received : 2019.09.10
  • Accepted : 2019.10.28
  • Published : 2019.10.31
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Abstract

In order to understand the distribution of organic matter and heavy metal concentrations in the surface sediments of fishery resources protection areas (FRPAs), we measured the grain size, ignition loss (IL), chemical oxygen demand (COD), acid volatile sulfide (AVS), and concentrations of heavy metals (As, Cd, Cr, Cu, Fe, Hg, Pb, and Zn) in the surface sediments collected at 54 stations of 5 FRPAs (Gamak Bay, Yeoja Bay, Deukryang Bay, Wando coast, and Youngkwang coast) in the southwestern coast of Korea in February 2017. The surface sediments consisted of fine sediment such as mud, with 2.9~8.8Ø (7.4±0.1Ø) of mean grain size. The average concentrations of IL, COD, and AVS in the sediments were 4.63±0.96 %, 13.0±3.1 mgO2/g·dry, and 0.092±0.124 mgS/g·dry, respectively, and were lower for sediments from the Youngkwang coast than those from other FRPAs. The average concentrations of heavy metals in the sediment were 7.5±0.9 mg/kg for As, 0.04±0.02 mg/kg for Cd, 70.2±9.7 mg/kg for Cr, 15.3±2.8 mg/kg for Cu, 3.3±0.5 % for Fe, 0.014±0.003 mg/kg for Hg, 25.0±6.0 mg/kg for Pb, and 99±14 mg/kg for Zn, respectively, and were relatively higher for sediments in the inner bays than those from the outer bays and coasts. Based on the assessment of sediment samples using the sediment quality guidelines (SQGs), the pollutant load index (PLI), and the ecological risk index (ERI), the surface sediments of FRPAs in the southwestern coast of Korea do not appear to be polluted by heavy metals, suggesting that the heavy metal concentrations in the sediments would not adversely impact aquatic and benthic organisms.

수산자원보호구역의 유기물과 중금속 분포특성을 파악하기 위하여 2017년 2월 남서해연안 5개 수산자원보호구역(가막만, 여자만, 득량만, 완도연안, 영광연안) 54개 정점에서 표층 퇴적물을 채취하여 입도, 강열감량(IL), 화학적산소요구량(COD), 산휘발성황화물(AVS) 및 중금속(As, Cd, Cr, Cu, Fe, Hg, Pb, Zn)을 분석하였다. 평균입도(Mz)는 평균 7.4±0.1Ø 였으며, 주로 세립한 니(mud) 퇴적물로 구성되어 있었다. IL, COD와 AVS의 평균농도는 각각 4.63±0.96 %, 13.0±3.1 mgO2/g·dry, 0.092±0.124 mgS/g·dry 였으며, 영광연안이 다른 보호구역에 비해 낮았다. 중금속의 평균농도는 각각 As 7.5±0.9 mg/kg, Cd 0.04±0.02 mg/kg, Cr 70.2±9.7 mg/kg, Cu 15.3±2.8 mg/kg, Fe 3.3±0.5 %, Hg 0.014±0.003 mg/kg, Pb 25.0±6.0 mg/kg, Zn 99±14 mg/kg 였으며, 보호구역내 대부분 만 안쪽에서 높고 만 외측 및 외측연안에서 낮은 특성을 보였다. 퇴적물기준(sediment quality guidelines, SQGs), 오염부하량지수(pollution load index, PLI), 생태계위해도지수(ecological risk index, ERI)를 사용하여 퇴적물 중금속 오염도를 평가한 결과, 남서해연안 수산자원보호구역 퇴적물은 수산생물 및 저서생물에 영향을 주지 않는 안전한 중금속 농도를 유지하고 있었다.

Keywords

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