Release and Phase Partitioning of Metals from Anoxic Estuarine Sediments during Periods of Simulated Resuspension
| Autor: | Mark G. Cantwell, Dana R. Kester, Robert M. Burgess |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Pollution
Geologic Sediments Time Factors media_common.quotation_subject Mineralogy Water column Suspensions Metals Heavy Environmental Chemistry Anaerobiosis Particle Size Water pollution media_common Chemistry Water Pollution Sediment General Chemistry Hydrogen-Ion Concentration Particulates Anoxic waters Oxygen Environmental chemistry Enrichment factor Algorithms Water Pollutants Chemical |
| Zdroj: | Environmental Science & Technology. 36:5328-5334 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/es0115058 |
| Popis: | 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 > or = 1 microm) and filterable (< 1 microm) 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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