Release and phase partitioning of metals from anoxic estuarine sediments during periods of simulated resuspension

被引:96
作者
Cantwell, MG
Burgess, RM
Kester, DR
机构
[1] US EPA, Environm Res Lab, Off Res & Dev,Atlantic Ecol Div, Natl Hlth Effects Environm Res Lab, Narragansett, RI 02882 USA
[2] Univ Rhode Isl, Grad Sch Oceanog, Narragansett, RI 02882 USA
关键词
D O I
10.1021/es0115058
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Periodically, marine sediments are subjected to physical processes which resuspend them into the water column, releasing previously sequestered metals. The role of resuspension energy and duration on release and subsequent redistribution of sediment bound metals was measured experimentally using a particle entrainment simulator. Two metal contaminated anoxic sediments with different physical and chemical characteristics were resuspended for 12 h at energies of 2 and 5 dynes cm(-2). Samples were taken at specified intervals, and the water column pH, Eh and dissolved oxygen levels were monitored continuously. Over time, metal concentrations increased in the particulate (nonfilterable greater than or equal to 1 mum) and filterable (< 1 mum) phases of the overlying water. In general, metal enrichment followed the Irving-Williams order of complex stability. Overall, the sediment's chemical and physical composition were major factors in determining the amount of metal released, more so than the level of resuspension energy applied. These results provide insight into how physical and chemical processes interact during sediment resuspension to release sediment bound metals and control their phase distribution in the water column.
引用
收藏
页码:5328 / 5334
页数:7
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