科研之友
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摘要
This study compared the sediment characteristics, heavy metal content, enrichment factor (EF), geo-accumulation index (I-geo) and other heavy metal pollution indicators between the sediments inside and outside the Kaohsiung Ocean Dredged Material Disposal Site (KODMDS). The aim was to examine the impact of dumping harbor dredged sediments into the ocean on the heavy metal distribution in the sediments of KODMDS. The relatively significant variations were found in particle size distribution of the disposal site, whereas those of the outside disposal site were relatively stable. Results indicate that the organic and heavy metal content in the disposal site were significantly higher than those outside the disposal site. Compared with the sediments outside the disposal site, the heavy metal enrichment and accumulation level in the disposal site increased in the dredged sediments, especially the content of Cr, Cu, and Zn. According to the analysis results of the heavy metal pollution indicators, including: the pollution load index (PLI), mean effect range median quotient (m-ERM-q) and potential ecological risk index (RI), the level of heavy metal pollution, the potential eco-toxicity and the potential ecological risk of the sediments inside the disposal site all showed a slight increase albeit without significant impact on the benthos inhabiting the disposal site. The result also indicates that the content of heavy metal in the dredged sediments constitutes one of the major factors that account for the increased heavy metal content in the sediments of the disposal site. In addition, the method of dumping the dredged sediments and the environmental condition of KODMDS may be some of the reasons for the same level of heavy metal content in sediments from KODMDS, where dredged sediments have been dumped for 10 years, and from other sea areas without disposal of dredged sediments.
- 出版日期2017-2
