ISSN : 1225-3480
The Organic matter and trace metal contents and trace metal contents of sediments and their pollution levels at 9 stations were investigated in order to characterize sediment environment characteristics in the Geojeman Bay shellfish farming waters. The grain size of the surrounding sediments of the Geojeman Bay shellfish farm was in the order of mud in all samples. Clay contents ranged from 20.75-28.14% (24.15%), and the silt content 71.87-79.24% (75.85%). Ignition loss (IL) was in the range of 7.7-9.9% (9.2 ± 0.64%). Chemical oxygen demand (COD) was in the range of 17.9-26.6 mgO2/g (21.6 ± 2.52 mgO2/g). There is a possibility of contamination of organic matter. The concentrations of trace metals (As, Cd, Cr, Cu, Ni, Pb and Zn) in sediments of Geojeman Bay were analyzed. The contamination level of trace metals was evaluated by the concentration of each element. Cu exceeded the marine environment standard of threshold effects level. As, Cd, Cr, Ni, and Pb were below marine environment standard of threshold effects level in all study area. The pollution load index (PLI) for evaluating the total pollution level of trace metals was 1.1-1.4 (1.3), all study area and showed relatively high pollution at the entrance of the bay. The ecosystem risk index (ERI), was 98.8-131.14 (114.7), which was a moderate risk to some extent at most study area. Cr, Pb, and Zn were unpolluted, Cu and Cd were moderately polluted from nonpolished, and As was a medium pollution level. Moderately polluted.
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