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Contents of Inorganic Elements in Shellfish and Geochemical Characteristics of Surface sediments on the West Coast of Korea

Yoon Seok Choi, Kwang Jae Park, Jae Hee Song, Sang Pil Yoon, Sang Ok Chung and Kyoung Ho An

Tidal Flat Research Institute, NFRDI, Kunsan 573-882, Korea

In order to evaluate the relationship of between the contents of inorganic elements in shellfish and surface sediments, we measured the concentration of inorganic elements (As, Ca, Cd, Cr, Fe, Hg, Li, Mn, Ni, P, Pb, Zn) in various shellfish and surface sediments of research area. The enrichment factor (EF) and the index of accumulation rate (Igeo) of the metals showed that the research areas can be classified as moderately polluted, or unpolluted. And also we measured the geochemical characteristics of surface sediments(grain size, chemical oxygen demand (COD), ignition loss (IL) and acid volatile sulfide (AVS). The grain sizes for research areas of surface sediment were similar the ratio of silt and clay in comparison with other sites. The COD and IL in surface sediment ranged from 5.41 to 14.06 mg/g. d.w. (mean 8.78 ± 3.16 mg/g d.w.) and from 0.92 to 3.17% (mean 2.08 ± 0.86%), respectively. Siginificant differences in metal concentrations also were determinated in the shellfish tissue among the different sites. However, except for metals(Mn, Zn), which showed some elevation of concentrations, the variations in the shellfish tissue were not related to variations in the sediment.

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