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Issue 8, 2018
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Cerium oxide nanoparticles transformation at the root–soil interface of barley (Hordeum vulgare L.)

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Abstract

The transformation of cerium oxide nanoparticles (CeO2-NPs) in soil and its role in plant uptake is a critical knowledge gap in the literature. This study investigated the reduction and speciation of CeO2-NPs in barley (Hordeum vulgare L.) cultivated in soil amended with 250 mg CeO2-NPs per kg soil. Synchrotron micro-X-ray fluorescence (μXRF) was employed for spatial localization and speciation of CeO2-NPs in thin sections of intact roots at the soil–root interface. Results revealed that Ce was largely localized in soil and at the root surface in nanoparticulate form (84–90%). However, a few hot spots on root surfaces revealed highly significant reduction (56–98%) of CeO2-NPs [Ce(IV)] to Ce(III) species. Interestingly, only roots in close proximity to hot spots showed Ce uptake which was largely CeO2 (90–91%) with very little amount of Ce(III) (9–10%). These results suggest that the reduction of CeO2-NPs to Ce(III) is needed to facilitate uptake of Ce. Future studies should investigate the reducing agents (e.g. exudates, microbes) involved in CeO2-NPs in barley roots.

Graphical abstract: Cerium oxide nanoparticles transformation at the root–soil interface of barley (Hordeum vulgare L.)

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Supplementary files

Article information


Submitted
18 Mar 2018
Accepted
24 Jun 2018
First published
25 Jun 2018

Environ. Sci.: Nano, 2018,5, 1807-1812
Article type
Communication

Cerium oxide nanoparticles transformation at the root–soil interface of barley (Hordeum vulgare L.)

C. M. Rico, M. G. Johnson and M. A. Marcus, Environ. Sci.: Nano, 2018, 5, 1807
DOI: 10.1039/C8EN00316E

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