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To examine the sedimentary geochemical characteristics of sediment in the Tamjin River andDoam bay, the analysis was conducted, using the sample obtained in February 2000, on thegrain size and the contents of metallic elements and organic carbon. The factors that influencethe geochemical behavior of metallic elements in the surface sediment are grain size, organism,surrounding soil and CaCO3. To find out the pollution level of metallic elements, theenrichment factor (EF) and the index of geoaccumulation (Igeo) were researched. The majority ofmetallic elements sustain their values in natural state. The elements such as K, Ba, Zr, etc.appear to be rich in some places. The EFand Igeo of P, Cu, Zn, and Pb, which belong to toxicheavy metals, are partly related with man-made pollution. P and Cu have a high EF, Pb has ahigh I geo and Zn is high in both EFand I geo. The low contents of P and Cu are not likely to berelated with the pollution of water environment. However, given the development of relativepollution, the research and the management regarding the pollutants are needed. Because Pb,naturally enriched by geological characteristics, has a large influence on water environmentalong with Zn, the adequate measures against man-made pollution should be worked out.

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