The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Heavy Metals in Surface Sediments from Doam Bay, Southwestern Coast of Korea

한국 남서해안 도암만 표층퇴적물의 중금속 함량 및 분포 특성

  • CHO, HYEONG-CHAN (Department of Marine Resources, Mokpo National University) ;
  • CHO, YEONG-GIL (Department of Marine Resources, Mokpo National University)
  • 조형찬 (목포대학교 해양자원학과) ;
  • 조영길 (목포대학교 해양자원학과)
  • Received : 2015.09.24
  • Accepted : 2015.11.10
  • Published : 2015.11.30
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Abstract

Forty-four surface sediments from Doam Bay were analyzed for total organic carbon (TOC), total nitrogen (TN), total metal (Al, Fe, Mn, Cr, Cu, Ni, Pb, Zn) and further chemical partitioning of metals were carried out in some samples. The TOC (0.32~3.10%) and TN (0.03~0.26%) values of the samples were similar to those of other coastal area. The C/N ratios ranged from 7.9 to 11.9 with an average 9.3 which revealed that contribution of terrestrial organic matters was relatively rare. Contents of analysed metals showed a level lower than threshold effects level (TEL) in sediment quality guidelines. Based on the chemical speciation of metals, the lattice fractions were found in the order Cr > Cu > Ni > Zn > Pb > Mn, while Mn and Pb are the ratio of the non-lattice fractions accounted for more than 50%. The average baseline values were obtained relative cumulative frequency curves and linear regression analysis. The respective baseline concentrations for Cu, Ni, Pb, Zn, Cr and Mn were 11.8, 23.1, 26.8, 76.6, 56.7, 585 mg/kg, respectively. Based on geoaccumulation index ($I_{geo}$) with a baseline values of Mn showed that face the contamination phase from estuarine stations. However, in case of Zn and Pb, although there is no sign of contamination, it could be release from sediment when there is a change in the environment, which is caused from the high ratio of non-lattice fractions.

한국 남서해 연안의 도암만에서 44개 표층퇴적물을 채취하여 총유기탄소(TOC), 총질소(TN) 및 중금속(Al, Fe, Mn, Cr, Cu, Ni, Pb, Zn)을 분석하였으며, 11개 시료에 대해서는 화학적 존재형태별 분석을 병행하였다. TOC(0.32~3.10%), TN(0.03~0.26%)은 주변 해역의 평균 수준이었고, C/N 비(7.9~11.9)에 근거할 때 육상기원 유기물의 영향이 반영된 일부 지역이 구분되었다. 중금속 함량은 대부분의 정점에서 해양퇴적물 주의기준(TEL) 이하였고, 화학적 존재형태별 함량은 광물격자부분에서 Cr, Cu, Ni 등이, 비광물격자부분에서 Mn, Pb가 총량의 절반을 상회하였다. 연구지역의 중금속 배경농도를 누적빈도곡선과 선형회귀분석에 의해 추정한 결과 Cu=11.8, Ni=23.1, Pb=26.8, Zn=76.6, Cr=56.7, Mn=585 mg/kg으로 계산되었으며, 이를 바탕으로 한 농축지수($I_{geo}$)에 근거해 국지적인 Mn 농축의 징후를 확인하였다. 그러나 농축지수와 존재형태비를 고려할 때 Zn, Pb도 환경변화에 따른 용출 가능성이 추정되었다.

Keywords

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