Comparative toxicity of rod-shaped nano-CeO2 and nano-CePO4 to lettuce

Author:

Liu Yabo1ORCID,Ma Yuhui23ORCID,Jiao Chunlei2ORCID,Liu Mengyao1ORCID,Luo Wenhe2ORCID,Dong Chaonan2ORCID,Fan Shixian2ORCID,He Xiao23ORCID,Yang Fang1ORCID,Zhang Zhiyong234ORCID

Affiliation:

1. Hebei Provincial Key Lab of Green Chemical Technology & High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China

2. Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

3. CAS-HKU Joint Laboratory of Metallomics on Health & Environment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

4. School of Physical Sciences, University of the Chinese Academy of Sciences, Beijing 100049, China

Abstract

Abstract The influence of morphology on the biological effects of nanomaterials (NMs) has not been well understood. In the present study, we compared the phytotoxicity of rod-shaped nano-cerium dioxide (R-CeO2) and nano-cerium phosphate (R-CePO4) to lettuce plants. The results showed that R-CeO2 significantly inhibited the root elongation of lettuce, induced oxidative damages, and caused cell death, while R-CePO4 was nontoxic to lettuce. The different distribution and speciation of Ce in plant tissues were determined by transmission electron microscopy (TEM) and X-ray absorption near edge spectroscopy (XANES) combined with linear combination fitting (LCF). The results showed that in the R-CeO2 group, part of Ce was transformed from Ce(IV) to Ce(III), while only Ce(III) was present in the R-CePO4 group. When interacting with plants, R-CeO2 is easier to be dissolved and transformed than R-CePO4, which might be the reason for their different phytotoxicity. Although both are Ce-based NMs and have the same morphology, the toxicity of R-CeO2 seems to come from the released Ce3+ ions rather than its shape. This research emphasizes the importance of chemical composition and reactivity of NMs to their toxicological effects.

Funder

National Natural Science Foundation of China

China Scholarship Council

Publisher

Oxford University Press (OUP)

Subject

Metals and Alloys,Biochemistry,Biomaterials,Biophysics,Chemistry (miscellaneous)

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