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Assessment of Heavy Metal Pollution in Mangrove Sediments of Chuuk and Kosrae, Federated States of Micronesia

마이크로네시아 맹그로브 퇴적물 내 중금속 오염도 평가

  • 나공태 (한국해양과학기술원 해양환경.보전연구부) ;
  • 이미진 (한국해양과학기술원 해양정책연구소) ;
  • 노재훈 (한국해양과학기술원 해양생태계연구부) ;
  • 박흥식 (한국해양과학기술원 태평양해양연구센터) ;
  • 김은수 (한국해양과학기술원 해양관측기술.자료본부) ;
  • 권문상 (한국해양과학기술원 해양정책연구소) ;
  • 김경태 (한국해양과학기술원 해양환경.보전연구부)
  • Received : 2013.09.06
  • Accepted : 2013.12.11
  • Published : 2013.12.30

Abstract

Heavy metals in the mangrove sediments of Chuuk and Kosrae, Federated States of Micronesia were analyzed to examine the pollution levels of heavy metals using enrichment factor (EF) and pollution load index (PLI). The mean concentrations of Cr, Ni, Cu, Zn, As, Cd and Pb in surface mangrove sediments were 642, 125, 46.9, 149, 15.6, 0.14 and 8.55 ${\mu}g$, respectively. Kosrae mangrove sediments showed the highest concentrations of Cr and Ni while Chuuk contains more of other metals such as Cu, Zn, As, Cd and Pb. Compared to those from other mangrove regions of the world, Cr, Ni and As levels in mangrove sediments from Micronesia were at higher levels whereas Cu, Zn, Cd and Pb were at lower to median levels. In core sediment of Chuuk, metal concentrations in the upper part were higher than those in the lower part. Based on the EF and PLI values, As is evaluated as the heaviest contaminant in the surface sediment from Micronesia whilst other metals (Cr, Ni, Cu, Zn, Cd and Pb) are present at slightly lesser levels.

본 연구에서는 FSM 축과 코스레 맹그로브 퇴적물 내 7개 중금속(Cr, Ni, Cu, Zn, As, Cd 및 Pb)의 오염도를 평가하였다. 맹그로브 퇴적물 내 중금속의 평균농도는 Cr 642 ${\mu}g/g$, Ni 125 ${\mu}g/g$, Cu 46.9 ${\mu}g/g$, Zn 149 ${\mu}g/g$, As 15.6 ${\mu}g/g$, Cd 0.14 ${\mu}g/g$ 및 Pb 8.55 ${\mu}g/g$으로 Cr의 농도가 가장 높았으며 Cd이 가장 낮은 농도로 존재하고 있었다. 축과 코스레 지역을 비교하면 코스레 맹그로브 퇴적물은 Cr과 Ni의 농도가 축에 비해 높았으며, 나머지 원소인 Cu, Zn, As, Cd 및 Pb는 축 맹그로브 퇴적물에서의 농도가 코스레에 비해 높은 것으로 나타났다. 세계의 맹그로브 지역의 퇴적물 내 중금속의 농도와 비교한 축과 코스레 지역에서 채취한 맹그로브 퇴적물 Cr, Ni 및 As의 농도는 인간활동에 의한 인위적인 오염이 존재하는 다른 지역보다 높은 수준으로 나타났으며, Cu, Zn, Cd 및 Pb은 오염되지 않은 지역과 유사한 농도를 나타내었다. EF와 PLI를 이용하여 농축도(오염도) 평가결과에 의하면, As의 농축도는 높으나 나머지 원소는 오히려 배경농도에 비해 결핍된 것을 알 수 있었다.

Keywords

References

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