Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 263, Issue -, Pages 677-684Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.10.030
Keywords
CeO2 NPs; Capping; Seed germination; Uptake; Root biomass
Categories
Funding
- National Science Foundation
- Environmental Protection Agency [DBI-0830117]
- USDA [2011-38422-30835]
- NSF [CHE-0840525]
- Mexican Consejo Nacional de Ciencia y Tecnologia (CONACyT) [186095]
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Little is known about the mobility, reactivity, and toxicity to plants of coated engineered nanoparticles (ENPs). Surface modification may change the interaction of ENPs with living organisms. This report describes surface changes in commercial CeO2 NPs coated with citric acid (CA) at molar ratios of 1:2, 1:3,1:7, and 1:10 CeO2:CA, and their effects on radish (Raphanus sativus) seed germination, cerium and nutrients uptake. All CeO2 NPs and their absorption by radish plants were characterized by TEM, DLS, and ICP-OES. Radish seeds were germinated in pristine and CA coated CeO2 NPs suspensions at 50 mg/L, 100 mg/L, and 200 mg/L. Deionized water and CA at 100 mg/L were used as controls. Results showed zeta Potential values of 21.6 mV and -56 mV for the pristine and CA coated CeO2 NPs, respectively. TEM images showed denser layers surrounding the CeO2 NPs at higher CA concentrations, as well as better distribution and smaller particle sizes. None of the treatments affected seed germination. However, at 200 mg/L the CA coated NPs at 1:7 ratio produced significantly (p <= 0.05) more root biomass, increased water content and reduced by 94% the Ce uptake, compared to bare NPs. This suggests that CA coating decrease CeO2 NPs toxicity to plants. (C) 2013 Elsevier B.V. All rights reserved.
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