Nanosilver and Nano Zero-Valent Iron Exposure Affects Nutrient Exchange Across the Sediment–Water Interface
| Autor: | Clayton J. Williams, Joel A. Kelly, Marguerite A. Xenopoulos, Robert W. Buchkowski, Jonathan G. C. Veinot |
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| Rok vydání: | 2015 |
| Předmět: |
Nutrient cycle
Silver Denitrification Iron Health Toxicology and Mutagenesis 0211 other engineering and technologies Ecological and Environmental Phenomena Metal Nanoparticles chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Toxicology 01 natural sciences chemistry.chemical_compound Rivers Nitrate Sediment–water interface Ecosystem 0105 earth and related environmental sciences 021110 strategic defence & security studies Zerovalent iron Nitrates Phosphorus Water General Medicine Nitrogen Cycle Pollution 6. Clean water Oxygen chemistry 13. Climate action Environmental chemistry Nanoparticles Water quality Surface water Water Pollutants Chemical |
| Zdroj: | Bulletin of Environmental Contamination and Toxicology. 96:83-89 |
| ISSN: | 1432-0800 0007-4861 |
| DOI: | 10.1007/s00128-015-1697-z |
| Popis: | To examine how nanoparticles influence biogeochemical cycles in streams, we studied the acute impact of nanosilver (nAg) and nanoparticulate zero-valent iron (nZVI) exposure on nutrient and oxygen exchange across the sediment-water interface of two streams (agricultural canal and wetland) that differed in their water quality and sediment characteristics. At the agricultural site, nAg increased oxygen consumption and decreased N2 flux rates from that observed in control incubations. nZVI caused sediment-water systems from both streams to go hypoxic within 1.5 h of exposure. N2 flux rates were at least an order of magnitude higher in nZVI treatments as compared to control. Water column nitrate and nitrite concentrations were not impacted by nZVI exposure but total dissolved phosphorus concentrations were higher in cores treated with nZVI. nAg and nZVI exposure to surface water ecosystems can disrupt ecological function across the sediment-water interface. |
| Databáze: | OpenAIRE |
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