강진만 표층퇴적물의 지화학적 특성과 환경 변화
The Geochemical Characteristics and Environmental Change of Surface Sediments in Gangjin Bay, Korea
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In order to observe the geochemical characteristics and environmental changes of surface sediments in Gangjin Bay, 35 sediment samples were chemically analyzed. The geochemical variation during the last 10 years was investigated in order to compare the results of this study with the one in 2000. According to the geochemical comparison of the two cases, most elements are proportional to grain sizes and organic carbon contents with a coefficient above 0.8. Fine clay minerals and organic matters control the behaviors of elements in the above sediments. Also, in the case of Ca and Sr, shell fragments surrounding the geological setting and oxides influence its contents. In the sediments, the EF(Enrichment Factor) of P, Co, Cr, Cu and Ni are below 1, but Li, Zn and Pb are between 2.16~5.95, 0.78~1.67, and 1.20~2.85. The Igeo(index of geoaccumulation) values are above 1.0 in Co, Cr, Cu, Li, Ni and Zn. This means that the sediments are moderately contaminated. The T-test results show that the contents of Al, Mg, Ca, Na, K, Ti, P, Cu, Li, Sc, Sr, Zn and organic carbon, are meaningful, the p-value being less than 0.05 (p<0.05). The geochemical tendencies of this area might be related with the closing effect due to the construction of Tamjin Dam, the straightening of the stream courses, and the building up of breakwater. In addition, heavy elements such as Cu, Zn and Pb are enriched in this area because organic matters can easily adsorb them. In conclusion, in order to observe the environmental change of surface sediments, it is necessary to monitor the bay continuously.
Abstract
In order to observe the geochemical characteristics and environmental changes of surface sediments in Gangjin Bay, 35 sediment samples were chemically analyzed. The geochemical variation during the last 10 years was investigated in order to compare the results of this study with the one in 2000. According to the geochemical comparison of the two cases, most elements are proportional to grain sizes and organic carbon contents with a coefficient above 0.8. Fine clay minerals and organic matters control the behaviors of elements in the above sediments. Also, in the case of Ca and Sr, shell fragments surrounding the geological setting and oxides influence its contents. In the sediments, the EF(Enrichment Factor) of P, Co, Cr, Cu and Ni are below 1, but Li, Zn and Pb are between 2.16~5.95, 0.78~1.67, and 1.20~2.85. The Igeo(index of geoaccumulation) values are above 1.0 in Co, Cr, Cu, Li, Ni and Zn. This means that the sediments are moderately contaminated. The T-test results show that the contents of Al, Mg, Ca, Na, K, Ti, P, Cu, Li, Sc, Sr, Zn and organic carbon, are meaningful, the p-value being less than 0.05 (p<0.05). The geochemical tendencies of this area might be related with the closing effect due to the construction of Tamjin Dam, the straightening of the stream courses, and the building up of breakwater. In addition, heavy elements such as Cu, Zn and Pb are enriched in this area because organic matters can easily adsorb them. In conclusion, in order to observe the environmental change of surface sediments, it is necessary to monitor the bay continuously.
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