한국환경과학회지 (Journal of Environmental Science International)

  • 제13권5호
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  • Pages.479-488
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  • 2004
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  • 1225-4517(pISSN)
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  • 2287-3503(eISSN)
한국환경과학회 (The Korean Environmental Sciences Society)
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시화호의 중금속 오염과 산화-환원 상태의 공간적 차이

Heavy Metal Contamination and Spatial Differences in Redox Condition of the Artificial Shihwa lake, Korea

  • Hyeon, Sang-Min (Southern Coastal Environmental Research Division of South Sea Institute, Korea Ocean Research and Development Institute (KORDI)) ;
  • Kim, Eun-Su (Marine Environment and Climage Laboratory, Korea Ocean Research and Development Institute (KORDI)) ;
  • Paeng, U-Hyeon (Southern Coastal Environmental Research Division of South Sea Institute, Korea Ocean Research and Development Institute (KORDI))
  • 발행 : 2004.05.01
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초록

Five sediment cores from the tidal flat of artificial Lake Shihwa are analyzed in terms of sedimentology and geochemistry to evaluate the heavy metal contamination and redox condition of surficial sediment following the Shihwa seawall construction. The variability of concentrations of various elements depends on the depositional environment, and reflects the various redox conditions and sediment provenances. The amounts of Ti and Al and their ratio of Ti/ Al with respect to Li clearly indicate that there is an anthropogenic contribution to the surficial sediment. The high concentrations of heavy metals suggest an anthropogenic contribution at ST. 34 and ST. 22. Concentrations of most elements (Cr, Cu, Zn and Pb) are higher near the Shihwa-Banwol industrial complex than in the central part of Lake Shihwa. Concentrations of heavy metal in surficial sediment near the Shihwa-Banwol industrial complex are two to eight times higher than in the center of Lake Shihwa. Enrichment factors (EF), which are normalized by the unpolluted shale, suggests a significant metallic contamination near the Shihwa-Banwol industrial complex (SBIC). The redox condition is divided into two anoxic and mixed oxi $c_oxic zones based on the carbon:sulfur (C/S) ratios of organic matter and elemental relationships. Correlations among geochemical elements Mn, U and Mo are significantly different from site to site, and may therefore be an indicator of the spatial redox condition. Controlling factors for switching anoxic/oxic conditions are thought to be water depth and the differences in industrial effluent supply. The variations of the Cu/Mn ratio in the sediments confirms above mentioned spatial differences of a redox condition in part, and therefore shows a location-dependence redox condition in sediments at four other sites. The redox condition of the surficial sediment characteristics of the Shihwa Lake are controlled by its geographic location and water depth.th.

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