Aging of dissolved copper and copper-based nanoparticles in five different soils: Short-term kinetics vs. long-term fate

Ryo Sekine; E R Marzouk; M Khaksar; K G Scheckel; J P Stegemeier; G V Lowry; E Donner; E Lombi

doi:10.2134/jeq2016.12.0485

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Aging of dissolved copper and copper-based nanoparticles in five different soils: Short-term kinetics vs. long-term fate

Journal article

Open access

Peer reviewed

Aging of dissolved copper and copper-based nanoparticles in five different soils: Short-term kinetics vs. long-term fate

Ryo Sekine, E R Marzouk, M Khaksar, K G Scheckel, J P Stegemeier, G V Lowry, E Donner and E Lombi

Journal of Environmental Quality, Vol.46(6), pp.1198-1205

2017

DOI: https://doi.org/10.2134/jeq2016.12.0485

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Abstract

With the growing availability and use of copper-based nanomaterials (Cu-NMs), there is increasing concern regarding their release and potential impact on the environment. In this study, the short-term (≤ 5 d) aging profile and the long-term (135 d) speciation of dissolved Cu, copper oxide, and copper sulfide nanoparticles (CuO-NPs and CuS-NPs) were investigated in five different soils using X-ray absorption spectroscopy. Soil pH was found to strongly influence the short-term chemistry of the Cu-NMs added at 100 mg kg-1 above background. Low pH soils promoted rapid dissolution of CuO-NPs that effectively aligned their behavior to that of dissolved Cu within 3 d. In higher pH soils, CuO-NPs persisted longer due to slower dissolution in the soil and resulted in contrasting short-term speciation compared with dissolved Cu, which formed copper hydroxides and carbonates that were reflective of the soil chemistry. Organic matter appeared to slow the dissolution process, but in the long term, the speciation of Cu added as dissolved Cu, CuO-NPs, and CuS-NPs were found to be same for each soil. The results imply that, in the short term, Cu-NMs may exhibit unique behavior in alkaline soils compared with their conventional forms (e.g., in the event of an adverse leaching event), but in the long term (≥135 d), their fates are dictated by the soil properties, are independent of the initial Cu form, and are likely to present minimal risk of nanospecific Cu-NM impact in the soil environment for the concentration studied here.

Details

Title: Aging of dissolved copper and copper-based nanoparticles in five different soils: Short-term kinetics vs. long-term fate
Authors: Ryo Sekine (Author) - University of South Australia
E R Marzouk (Author) - University of South Australia
M Khaksar (Author) - University of South Australia
K G Scheckel (Author) - National Risk Management Research Laboratory, United States
J P Stegemeier (Author) - Carnegie Mellon University, United States
G V Lowry (Author) - Carnegie Mellon University, United States
E Donner (Author) - University of South Australia
E Lombi (Author) - University of South Australia
Publication details: Journal of Environmental Quality, Vol.46(6), pp.1198-1205
Publisher: American Society of Agronomy, Inc.
Date published: 2017
DOI: 10.2134/jeq2016.12.0485
ISSN: 0047-2425
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450960202621
Output Type: Journal article

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Web Of Science research areas: Environmental Sciences

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