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Trace Metals in Surface Sediments of Garolim Bay, Korea

가로림만 표층 퇴적물 내 미량금속 분포 특성

  • PARK, KYOUNGKYU (Department of Marine Environmental Science, Chungnam National University) ;
  • CHOI, MANSIK (Department of Marine Environmental Science, Chungnam National University) ;
  • JOE, DONGJIN (Department of Marine Environmental Science, Chungnam National University) ;
  • JANG, DONGJUN (Department of Marine Environmental Science, Chungnam National University) ;
  • PARK, SOJUNG (Department of Marine Environmental Science, Chungnam National University)
  • 박경규 (충남대학교 해양환경과학과) ;
  • 최만식 (충남대학교 해양환경과학과) ;
  • 조동진 (충남대학교 해양환경과학과) ;
  • 장동준 (충남대학교 해양환경과학과) ;
  • 박소정 (충남대학교 해양환경과학과)
  • Received : 2020.03.31
  • Accepted : 2020.05.20
  • Published : 2020.05.31

Abstract

In 2010 and 2015, total 77 surface sediment samples were collected to assess the anthropogenic effects of trace metals in surface sediments of Garolim Bay, and the physical characteristics (particle size and specific surface area) and geochemical components (major (Al, Ca, Fe, K, Ba) and trace metals (Mn, Cs, Cr, Co, Ni, Cu, Zn, Pb), organic carbon and calcium carbonate) were analyzed. Mean grain size of Garolim Bay surface sediments ranged from 0.51-5.58 Ø (mean 3.98 Ø) and increased from the inlet of bay to the inner bay, and from the waterway to the land. Most of the metal concentrations except for some elements showed the similar distribution to those of mean grain size and specific surface area. As the particle size decreased and the specific surface area increased, the metal concentration increased. In order to estimate the factors controlling the concentration of trace metals, factor analysis was performed, and three factors were extracted (92.7% of the total variation). Factor 1 accounted for 71.3% of the total variation, which was a grain size factor. Factor 2 accounted for 14.2% of the total variation, Factor 3 accounted for 7.2% of the total variance. Enrichment factor was calculated using the particle size corrected background concentration. Metals with a enrichment factor of 1.5 or higher and the number of samples were 4 for Cr (St. 1, 16, 27, 39) and 1 for Pb (St. 39), but there were little differences in the concentrations of 1M HCl leached metals for these metals. The percentage of 1M HCl leached fraction to total metal concentration decreased in the order of Pb~Co>Cu>Zn~Mn>Ni>Cr. Comparing this value with contaminated and clean sediments in other coastal areas, the percentages for each metal were similar regardless of the trace metal levels in all regions. This fact might be resulted from the reaction between the 1M HCl solution and the different sediment constituents, indicating that there is a limit to apply this percentage of leached metal to the estimation of the contamination extent.

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