title: Nanosilver and Nano Zero-Valent Iron Exposure Affects Nutrient Exchange Across the Sediment-Water Interface.
abstract: 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.
authors.affiliation: Biology Department, Trent University, Peterborough, ON, K9J 7B8, Canada.|Yale School of Forestry and Environmental Studies, Yale University, New Haven, CT, USA.
authors.forename: Robert W
authors.initials: RW
authors.lastname: Buchkowski
authors.affiliation: Biology Department, Trent University, Peterborough, ON, K9J 7B8, Canada.|Department of Environmental Science and Biology, State University of New York - The College at Brockport, Brockport, NY, USA.
authors.forename: Clayton J
authors.initials: CJ
authors.lastname: Williams
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, AB, T6G 2G2, Canada.
authors.forename: Joel
authors.initials: J
authors.lastname: Kelly
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, AB, T6G 2G2, Canada.
authors.forename: Jonathan G C
authors.initials: JG
authors.lastname: Veinot
authors.affiliation: Biology Department, Trent University, Peterborough, ON, K9J 7B8, Canada. mxenopoulos@trentu.ca.
authors.forename: Marguerite A
authors.initials: MA
authors.lastname: Xenopoulos
mesh_terms: D055669:Ecological and Environmental Phenomena; D017753:Ecosystem; D007501:Iron / Q000737:chemistry / Q000633:toxicity; D053768:Metal Nanoparticles / Q000737:chemistry / Q000633:toxicity*; D053758:Nanoparticles; D009566:Nitrates / Q000737:chemistry; D058458:Nitrogen Cycle / Q000187:drug effects*; D010100:Oxygen / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D045483:Rivers / Q000737:chemistry; D012834:Silver / Q000737:chemistry / Q000633:toxicity; D014867:Water; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D009566:Nitrates; D014874:Water Pollutants, Chemical; D014867:Water; D010758:Phosphorus; D012834:Silver; D007501:Iron; D010100:Oxygen
keywords: Biogeochemical effects; Denitrification; Ecosystem function; Nanoparticles; Nutrient cycling