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Heavy Metal Contamination in Surface Sediments from Masan and Jinhae Bay, Southeast Coast of Korea

남해 동부해역 임해공단 연안퇴적물의 중금속 오염: 마산만 및 진해만

  • Cho, Yeong-Gil (Department of Marine Resources, Mokpo Nat'l University) ;
  • Lee, Chang-Bok (School of Earth and Environmental Sciences, Seoul Nat'l University)
  • 조영길 (목포대학교 해양자원학과) ;
  • 이창복 (서울대학교 지구환경과학부)
  • Received : 2012.07.20
  • Accepted : 2012.10.08
  • Published : 2012.11.25

Abstract

Concentrations of selected heavy metals (Al, Fe, Mn, Cr, Cu, Ni, Zn, Pb, As and Cd) in surface sediments from 96 sites in Masan and Jinhae Bay were studied in order to understand metal contamination. Results show that the surface sediments were mainly enriched by Cu (18-294 ppm), Zn (67-568 ppm), Pb (10-120 ppm) and Cd (0.2-3.5 ppm). The coastal zone of Masan Bay was significantly more contaminated than the non-coastal zone, and spatial distribution pattern suggested additional sources of heavy metal input in the coastal area. The enrichment ratio and geoaccumulation index ($I_{geo}$) have been calculated and the relative contamination levels assessed in the study area. The enrichment ratios of Cu, Zn, Pb and Cd in Masan Bay have been observed to be relatively high. $I_{geo}$ results reveal that the study area is not contaminated with respect to Fe, Mn, Cr and Ni; moderately to strongly contaminated with Cu, Zn and Pb; and strongly to strong contaminated with Cd. The high contents of Cu, Zn, Pb and Cd in the study area result from anthropogenic activities in the catchment area. Based on the eight different sediment quality guideline values from USA (ERL, ERM), Canada (TEL, PEL), Australia/New Zealand (ISQG-high, ISQG-low) and Hong Kong (ISQV-low, ISQV-high), sediment quality of Masan and Jinhae Bay was also assessed and characterized.

마산만과 진해만 해저에서 각각 31개와 65개 표층퇴적물을 채취하여 중금속(Al, Fe, Mn, Cr, Cu, Ni, Zn, Pb, As, Cd)을 분석하였다. 중금속 함량은 우리나라 주변의 만 및 하구 퇴적물에 비해 마산만에서 Fe, Cr, Cu, Zn, Pb, Cd, As 등이 높았고 진해만에서 Mn이 높았다. Cu, Zn, Pb, Cd, As는 항구 및 산업시설이 위치한 마산만 해안에서 매우 뚜렷한 증가를 보였으며 공간분포를 통한 오염물질의 근원지 추정이 가능하였다. 오염에 의한 중금속 농축은 지각의 함량을 배경농도로 한 농축비에 근거할 때 진해만은 국지적으로, 반면에 마산만은 넓은 지역에 걸쳐 활발히 진행된 것으로 확인되었으며 특히 Cu, Zn, Pb 및 Cd의 농축비가 대비되었다. As, Cd, Cr, Cu, Pb, Ni, Zn 함량을 중금속 환경기준에 적용한 결과 진해만 시료의 일부와 마산만 시료의 거의 대부분이 주의기준(NOAA ERL, EC TEL, ANZECC ISQG-low, Hong Kong ISQV-low)을 초과하였으며, Cu 및 Zn 함량은 일부 마산만 시료에서 관리기준(NOAA ERM, EC PEL, ANZECC ISQG-high, Hong Kong ISQV-high)을 초과하였다. $I_{geo}$ 값에 근거한 마산만의 중금속 오염은 Fe, Mn, Cr, Ni는 우려할 만한 수준이 아닌 반면 Cu, Zn, Pb는 강한 오염단계에 직면해 있거나 진입해 있으며, Cd는 시료의 87.1%가 강한 오염단계 이상의 심화된 오염상태로 파악되었다.

Keywords

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