標題: Assessment of sediment toxicity by metal speciation in different particle-size fractions of river sediment
作者: Lin, JG
Chen, SY
Su, CR
環境工程研究所
Institute of Environmental Engineering
關鍵字: metal speciation;particle-size fraction;sediment toxicity
公開日期: 2003
摘要: Mobility and toxicity of metals associated with sediments are generally affected by metal speciation and granular compositions. Due to the various speciation patterns of heavy metals in sediments, it is not reliable to assess the potential toxicity of heavy metals on the aquatic environment with the total concentrations of heavy metals in sediments. The purposes of this study were to investigate the distribution of metal speciation in different particle-size fractions of sediments collected from two rivers (the Ke-Ya River and Ell-Ren River) in Taiwan, and to assess their potential toxicity to the aquatic ecosystem. Metals in the exchangeable, carbonate-bound and Fe/Mn oxide-bound forms obtained by sequential extraction were considered to be mobile and related with anthropogenic pollution. The degree of metal pollution and potential toxicity of sediments were higher in the lower reaches of both rivers. The metal speciation in sediments had a bimodal distribution over particle-size fractions. Heavy metals were subject to accumulation in the silt/clay fraction (< 25 mum) and coarse sand (420-2,000 mum). By normalizing the sum of the exchangeable, carbonate-bound, and Fe/Mn oxide-bound metals, it suggested that the potential toxicity to the aquatic ecosystem was caused by the fine sediments as well as coarse sediments.
URI: http://hdl.handle.net/11536/28189
ISSN: 0273-1223
期刊: WATER SCIENCE AND TECHNOLOGY
Volume: 47
Issue: 7-8
起始頁: 233
結束頁: 241
顯示於類別:會議論文