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The effect of U speciation in cultivation solution on the uptake of U by variant Sedum alfredii

Abstract

In the present study, five plant species were screened for uranium uptake using a hydroponic experimental set-up. The effect of the U concentration, pH, as well as the presence of carbonates, phosphates, and organic acids (lactic acid, malic acid, citric acid) on the uptake of U by variant S. alfredii (V S. alfredii) and wild S. alfredii (W S. alfredii) were investigated. Results showed that V S. alfredii exhibited higher U content in the roots than the other four plants and with the increase of U concentration in the solution, the U uptake by V S. alfredii and W S. alfredii increased. The results also showed that different U speciation in different cultivation solution took an important role on the uptake of U in variant Sedum alfredii: at pH 6.5, U hydrolysis species (UO2)3(OH)5 +is predominant and the U concentrations in V S. alfredii roots reached a maximum value (3.7 × 104 mg/kg). U complexation with carbonates, phosphates, and some organic acids in the solution resulted in a decrease in the U content in the roots except for lactic acid. Our researches highlight the correlations between U speciation and the uptake on V S. Alfredii, which will be helpful for improved removal of U from the groundwater using phytoremediation method.

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Acknowledgments

This work was financially supported by the State 863 project of China (Project No. 2012AA063503), the National Fund for Fostering Talents of Basic Science (J1210004), the National Natural Science Foundations of China (10776021, 21271132, CY112C018), and SRG from the University of Macau. We are grateful to Dr. Min Chen and Dr. Haiming Cheng of the College of Light Industry Textile and Food Engineering at Sichuan University for helpful discussions. We are also grateful to the College of Nuclear Technology and Automation Engineering at Chengdu University of Technology, and Comprehensive Training Platform of Specialized Laboratory, College of Chemistry at Sichuan University for analysis support.

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Correspondence to Ning Liu or Ruibing Wang or Chuanqin Xia.

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Responsible editor: Philippe Garrigues

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Du, L., Feng, X., Huang, Z. et al. The effect of U speciation in cultivation solution on the uptake of U by variant Sedum alfredii . Environ Sci Pollut Res 23, 9964–9971 (2016). https://doi.org/10.1007/s11356-016-6226-z

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Keywords

  • Phytoremediation
  • Uranium
  • variant S.alfredii