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Title: Macroscopic Observation of Soil Nitrification Kinetics Impacted by Copper Nanoparticles: Implications for Micronutrient Nanofertilizer

Journal Article · · Nanomaterials
 [1];  [2]
  1. Georgia College & State Univ., Milledgeville, GA (United States). Dept. of Biological and Environmental Sciences; DOE/OSTI
  2. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Natural Resources and Environmental Sciences

The potential agricultural use of metal nanoparticles (NPs) for slow-release micronutrient fertilizers is beginning to be investigated by both industry and regulatory agencies. However, the impact of such NPs on soil biogeochemical cycles is not clearly understood. In this study, the impact of commercially-available copper NPs on soil nitrification kinetics was investigated via batch experiments. The X-ray absorption near edge structure spectroscopy analysis showed that the NPs readily oxidized to Cu(II) and were strongly retained in soils with minimum dissolution (<1% of total mass). The Cu2+ (aq) at 1 mg/L showed a beneficial effect on the nitrification similar to the control: an approximately 9% increase in the average rate of nitrification kinetics (Vmax). However Vmax was negatively impacted by ionic Cu at 10 to 100 mg/L and CuNP at 1 to 100 mg/L. The copper toxicity of soil nitrifiers seems to be critical in the soil nitrification processes. In the CuNP treatment, the suppressed nitrification kinetics was observed at 1 to 100 mg/kg and the effect was concentration dependent at ≥10 mg/L. The reaction products as the results of surface oxidation such as the release of ionic Cu seem to play an important role in suppressing the nitrification process. Considering the potential use of copper NPs as a slow-release micronutrient fertilizer, further studies are needed in heterogeneous soil systems.

Research Organization:
Georgia College, Milledgeville, GA (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDA; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-98CH10886
OSTI ID:
1628504
Journal Information:
Nanomaterials, Journal Name: Nanomaterials Journal Issue: 11 Vol. 8; ISSN 2079-4991; ISSN NANOKO
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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