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Bioavailability and translocation of metal oxide nanoparticles in the soil-rice plant system

文献类型： 外文期刊

作者： Peng, Cheng 1 ; Tong, Hong 1 ; Shen, Chensi 1 ; Sun, Lijuan 4 ; Yuan, Peng 1 ; He, Miao 1 ; Shi, Jiyan 2 ;

作者机构： 1.Donghua Univ, Coll Environm Sci & Engn, Minist Environm Protect, Text Pollut Controlling Engn Ctr, Shanghai 201620, Peoples R China

2.Zhejiang Univ, Coll Environm & Resource Sci, MOE Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Peoples R China

3.Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

4.Shanghai Acad Agr Sci, Inst ECOenvironm & Plant Protect, Shanghai 201403, Peoples R China

关键词： Metal oxide nanoparticles; Rice; DTPA; Diffusive gradients in thin films; Bioavailability

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 713 卷

页码：

收录情况： SCI

摘要： To determine the bioavailability and translocation of metal oxide nanoparticles (MONPs) in the soil-rice plant system, we examined the accumulation and micro-distribution of ZnO nanoparticles (NPs), CuO NPs and CeO2 NPs (50, 100 and 500 mg/kg) in the paddy soil and rice plants under flooded condition for 30 days using single-step chemical extraction and diffusive gradients in thin films (DGT) technique combined with micro Xray fluorescence spectroscopy (mu-XRF). The results show that various MONPs changed the soil properties, especially the redox potential was enhanced to -165.33 to -75.33 mV compared to the control. The extraction efficiency of Zn, Cu and Ce in the paddy soil from high to low was EDTA, DTPA CaCl2 and DGT. Moreover, exposure to 500 mg/kg CuO NPs and CeO2 NPs induced the primary accumulation of Cu and Ce elements in rice roots as high as 235.48 mg Cu/kg and 164.84 mg Ce/kg, respectively, while the Zn concentration in shoots was up to 313.18 mg/kg under highest ZnO NPs with a 1.5 of translocation factor. The effect of MONPs on the plant growth was mainly related to the chemical species and solubility of MONPs. Micro-XRF analysis shows that Zn was mostly located in the root cortex while Cu was primarily accumulated in the root exodermis and few Ce distributed in the root. Pearson correlation coefficients indicate that only DTPA-extracted metals in soil were significantly and well correlated to the Zn, Cu and Ce accumulation in rice seedlings exposed to MONPs. This work is of great significance for evaluating the environmental risks of MONPs in soil and ensuring the safety of agricultural products. (C) 2020 Elsevier B.V. All rights reserved.

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