Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Change of Heavy Metals in the Surface Sediments of the Lake Shihwa and Its Tributaries

시화호 및 주변 하천 표층 퇴적물의 중금속 분포 변화

  • Kim, Kyung-Tae (Ocean Climate & Environment Research Division, KORDI) ;
  • Kim, Eun-Soo (Ocean Climate & Environment Research Division, KORDI) ;
  • Cho, Sung-Rok (Ocean Climate & Environment Research Division, KORDI) ;
  • Park, Jun-Kun (Ocean Climate & Environment Research Division, KORDI) ;
  • Park, Chung-Kil (Department of Environmental Engineering, Pukyong National University)
  • 김경태 (한국해양연구원 해양기후.환경연구본부) ;
  • 김은수 (한국해양연구원 해양기후.환경연구본부) ;
  • 조성록 (한국해양연구원 해양기후.환경연구본부) ;
  • 박준건 (한국해양연구원 해양기후.환경연구본부) ;
  • 박청길 (부경대학교 환경공학과)
  • Published : 2003.12.31
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Abstract

In order to understand the distribution of changes of geochemical characteristics in surface sediments according to various environmental changes around the artificial Lake Shihwa, surface sediments were sampled at $13{\sim}15$ sites form 1997 to 1999 and analyzed by C/S analyzer, ICP/MS and AAS. The average $S/C_{org}$ ratio was 0.35 in the surface sediments, which is similar to 0.36, the characteristic ratio of marine sediments. Heavy metal contents and enrichment factors in the surface sediments tended to be decreasing from the head to the mouth of the Lake Shihwa. With the deposition of fine-grained sediments in the central part of lake, anoxic water column induced the sulfides compounds with Cu, Cd and Zn. Metals such as Al, Fe, Cr, Co, Ni, Cu, Zn and Cd except for Mn and Pb showed relatively high correlation coefficients among them. The contents of Cr, Co, Ni, Cu, Zn and Cd in the surface sediments of the lake were two to five times higher than those in the lake before dike construction and also in outer part of the dike. These are mainly due to the Input of untreated industrial and municipal waste-waters into the lake, and the accumulation of heavy metals by limitation of physical mixing. Although metal contents of the surface sediments at the sites near the water-gate due to outer seawater inflow tended to be lower than those during the desalination, heavy metals were deposited in areas around the new industrial complex in the evidence of spatial distribution of heavy metals in the sediments. This is mainly due to the input of untreated waste-waters from tributaries.

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References

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