title: Fate and impact of zero-valent copper nanoparticles on geographically-distinct soils.
abstract: The fate of engineered zero-valent copper nanoparticles (Cu NPs) in soils collected from geographically-distinct regions of the continental United States and incubated under controlled conditions was investigated with respect to NP affinity for soil surfaces and changes in speciation, as well as their impact on bacterial communities. Soil geochemical properties had a great influence on Cu NP migration and transformation. Translocation of Cu NPs was low in soils enriched in organic matter and high in clay and sandy soils. X-ray absorption spectroscopic analysis showed that the highest rates for transformation to Cu ions and adsorption complexes was in acidic soils. Although there was some change in overall bacterial community richness at the level of order in experimental soil, the level of perturbation was evident in side-by-side comparisons of orders using a 50% microbial community change value (MCC50). This assessment revealed that generally, Sphingomonas, known for its importance for remediation, and Rhizobiales, symbiotic partners with certain plants appeared susceptible to Cu NPs and their transformation products. The ecological importance of organisms from these orders and its greater vulnerability to Cu NPs suggests need for future targeted studies.
authors: College of the Sciences and Mathematics, West Chester University, West Chester, PA 19382, USA. Electronic address: vshah@wcupa.edu.
authors: Vishal
authors: V
authors: Shah
authors: National Risk Management Research Laboratory, U.S. Environmental Protection Agency, Cincinnati, OH 45224, USA.
authors: Todd Peter
authors: TP
authors: Luxton
authors: Department of Biology, Queen's University, Kingston, ON K7L 3N6, Canada.
authors: Virginia K
authors: VK
authors: Walker
authors: Department of Natural Sciences, Southern University at New Orleans, New Orleans, LA 70126, USA.
authors: Terrell
authors: T
authors: Brumfield
authors: Department of Natural Sciences, Southern University at New Orleans, New Orleans, LA 70126, USA.
authors: Jerry
authors: J
authors: Yost
authors: College of the Sciences and Mathematics, West Chester University, West Chester, PA 19382, USA.
authors: Shreya
authors: S
authors: Shah
authors: Research and Testing Laboratory, Lubbock, TX 79407, USA.
authors: Jeremy E
authors: JE
authors: Wilkinson
authors: Department of Natural Sciences, Southern University at New Orleans, New Orleans, LA 70126, USA.
authors: Murty
authors: M
authors: Kambhampati
mesh_terms: D003300:Copper / Q000737:chemistry*; D005843:Geography; D053768:Metal Nanoparticles / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D014481:United States
chemical_list: D012987:Soil; D012989:Soil Pollutants; D003300:Copper
keywords: Bacteria; Copper nanoparticles; Environmental impact; Regression model; Transport