Effects of Aging on the Fate and Bioavailability of Cerium Oxide Nanoparticles to Radish (Raphanus Sativus L.) in Soil

Author

Weilan Zhang
Yongbo Dan
Honglan Shi, Missouri University of Science and TechnologyFollow
Xingmao Ma

Abstract

The fate and impact of cerium oxide nanoparticles (CeO₂NPs) on soil-grown plants have been intensively studied. However, all previous studies were performed in freshly prepared soils, without considering the temporal changes of the properties of CeO₂NPs in the environment. A growing body of evidence suggests that the properties of CeO₂NPs will change with aging, and therefore, it is essential to understand how the aging process affects the fate and bioavailability of CeO₂NPs in the environment. In this study, the effects of aging on the fractionation of CeO₂NPs in a silty loam soil and their bioavailability to radish were investigated. The results indicated that aging for 7 months did not affect the fractionation of CeO₂NPs in soil. However, the aging process significantly increased the concentration of Ce³⁺ in soil. The soil with aged CeO₂NPs contained a 40.5% higher concentration of Ce³⁺ than soil with fresh CeO₂NPs. The aging process also resulted in a significantly higher Ce concentration in the radish shoots (87.1% higher) grown in aged soil than in freshly contaminated soil, even though the Ce concentrations in radish storage root and fine roots were comparable between plants grown in these soils. The radish growth and nutritional status were unaffected by either the fresh or the aged CeO₂NPs. This study provides the first comprehensive evaluation of the effects of aging of CeO₂NPs on their fate and impact on soil-grown plants.

Recommended Citation

W. Zhang et al., "Effects of Aging on the Fate and Bioavailability of Cerium Oxide Nanoparticles to Radish (Raphanus Sativus L.) in Soil," ACS Sustainable Chemistry and Engineering, vol. 4, no. 10, pp. 5424 - 5431, American Chemical Society (ACS), Oct 2016.

The definitive version is available at https://doi.org/10.1021/acssuschemeng.6b00724

Department(s)

Chemistry

Comments

The authors acknowledge the financial support of the U.S. Department of Agriculture-AFRI (2012-67005-19585).

Keywords and Phrases

Aging; Bioavailability; Cerium oxide nanoparticles; Fractionation; Ionic cerium; Radish

International Standard Serial Number (ISSN)

2168-0485

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2016 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Oct 2016