Liu Yang, Zhao Xuepeng, Ma Yuhui, Dai Wanqin, Song Zhuda, Wang Yun, Shen Jiaqi, He Xiao, Yang Fang, Zhang Zhiyong
Hebei Provincial Key Laboratory of Green Chemical Technology & High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China.
Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
Nanomaterials (Basel). 2023 Sep 8;13(18):2523. doi: 10.3390/nano13182523.
As one of the most widely used nanomaterials, CeO nanoparticles (NPs) might be released into the aquatic environment. In this paper, the interaction of CeO NPs and Ce ions (0~10 mg/L) with duckweed ( L.) was investigated. CeO NPs significantly inhibited the root elongation of duckweed at concentrations higher than 0.1 mg/L, while the inhibition threshold of Ce ions was 0.02 mg/L. At high doses, both reduced photosynthetic pigment contents led to cell death and induced stomatal deformation, but the toxicity of Ce ions was greater than that of CeO NPs at the same concentration. According to the in situ distribution of Ce in plant tissues by -XRF, the intensity of Ce signal was in the order of root > old frond > new frond, suggesting that roots play a major role in the uptake of Ce. The result of XANES showed that 27.6% of Ce(IV) was reduced to Ce(III) in duckweed treated with CeO NPs. We speculated that the toxicity of CeO NPs to duckweed was mainly due to its high sensitivity to the released Ce ions. To our knowledge, this is the first study on the toxicity of CeO NPs to an aquatic higher plant.
作为应用最为广泛的纳米材料之一，二氧化铈纳米颗粒（NPs）可能会释放到水生环境中。本文研究了二氧化铈纳米颗粒和铈离子（0~10毫克/升）与浮萍（L.）的相互作用。当浓度高于0.1毫克/升时，二氧化铈纳米颗粒显著抑制浮萍根的伸长，而铈离子的抑制阈值为0.02毫克/升。在高剂量下，二者均会降低光合色素含量，导致细胞死亡并诱导气孔变形，但在相同浓度下，铈离子的毒性大于二氧化铈纳米颗粒。根据-XRF对植物组织中铈的原位分布，铈信号强度顺序为根＞老叶＞新叶，这表明根在铈的吸收中起主要作用。XANES结果表明，在用二氧化铈纳米颗粒处理的浮萍中，27.6%的Ce(IV)还原为Ce(III)。我们推测，二氧化铈纳米颗粒对浮萍的毒性主要归因于其对释放出的铈离子高度敏感。据我们所知，这是关于二氧化铈纳米颗粒对水生高等植物毒性的首次研究。
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