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Effects and mechanisms of meta-sodium silicate amendments on lead uptake and accumulation by rice

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Abstract

The objectives of this research were to study the effects of Na2SiO3 application on the uptake, translocation, and accumulation of Pb in rice and to investigate the mechanisms of Pb immobilization by Na2SiO3 in paddy rice soils and rice plants. Pot experiments were conducted using a Cd-Pb-Zn-polluted soil and Oryza sativa L. ssp. indica cv. Donglian 5. L3-edge X-ray absorption spectroscopy was used to identify Pb species in soils and roots. The results showed that the application of Na2SiO3 increased soil pH and available soil Si but decreased DTPA-extractable Pb in the soil. High dose of Na2SiO3 (12.5 g/kg) reduced the Pb level in brown rice as it inhibited Pb transfer from soil to rice grains, especially Pb transfer from the root to the stem. The Pb X-ray absorption near-edge spectroscopic analysis revealed that application of high dose of Na2SiO3 increased Pb-ferrihydrite and PbSiO3 precipitates in the soil and in the root while it reduced Pb-humic acids (Pb-HAs) in the soil and Pb-pectin in the root. The decrease in Pb availability in the soil can be partly attributed to increase the precipitation of PbSiO3 and the association of Pb2+ with Fe oxides in the soil. The inhibition of the root-to-stem translocation of Pb was partially due to the precipitation of PbSiO3 on the root surfaces or inside the roots.

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Acknowledgements

This study was funded by the National Natural Science Foundation of China (grant no. U1305232). The authors are grateful to Huang Bifei for the technical assistance in ICP-MS analysis, Xu Bo for his assistance with Fe-plaques analysis, and Shouyin Tang and Haixia Dong for their help with experimental protocols.

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Authors and Affiliations

  1. College of Resource and Environmental Science, Key Laboratory of Soil Environmental Health and Regulation in Fujian Province, Fujian Agriculture and Forestry University, Fuzhou, 350002, People’s Republic of China

    Mingliu Zhao, Honghong Li, Yifan Cai, Ming Kuang Wang, Yanhui Chen, Tuanhui Xie & Guo Wang

  2. Department of Soil and Environmental Sciences, National Chung-Hsing University, Taichung, Taiwan

    Yuting Liu

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  1. Mingliu Zhao
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  2. Yuting Liu
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  3. Honghong Li
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  4. Yifan Cai
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  5. Ming Kuang Wang
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  6. Yanhui Chen
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  7. Tuanhui Xie
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  8. Guo Wang
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Correspondence to Guo Wang.

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Responsible editor: Elena Maestri

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Zhao, M., Liu, Y., Li, H. et al. Effects and mechanisms of meta-sodium silicate amendments on lead uptake and accumulation by rice. Environ Sci Pollut Res 24, 21700–21709 (2017). https://doi.org/10.1007/s11356-017-9746-2

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  • DOI: https://doi.org/10.1007/s11356-017-9746-2

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