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Leaching stability of simulated waste forms for immobilizing An3+ by Gd2Zr2O7 with Nd3+

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Abstract

In order to investigate the anti-leaching capability of pyrochlore Gd2Zr2O7 immobilized An3+, trivalent neodymium was used as the simulacrums for radioactive wastes with trivalence, Gd2−x Nd x Zr2O7(0.0⩽x⩽2.0) series samples were successfully synthesized by high temperature solid reaction and using Gd2O3, ZrO2 powders as starting materials. The experiments of long-term chemical stability were conducted in synthetic seawater at 40 and 70 °C. The XRD diffractive data and extraction ratio of as-received samples were collected with the help of X-ray diffraction (XRD) instrument and inductively coupled plasma mass spectrometry (ICP-Mass). The results indicate that the phases of as-received compounds keep the single phase of pyrochlore. The extraction ratio of Gd3+, Zr4+ and Nd3+ in waste forms is increasing with the increase of immersion time in synthetic seawater. The extraction ratio of waste forms at 70 °C is higher than at 40 °C. The highest extraction ratio of Gd3+, Zr4+ and Nd3+ after 42 days is near 0.025 8, 0.003 8 and 0.045 2 μg·mL−1, respectively.

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Authors and Affiliations

  1. Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University of Science and Technology, Mianyang, 621010, China

    Xirui Lu  (卢喜瑞), Mengjun Chen, Faqin Dong & Zhengxue Xiao

  2. Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, China

    Xirui Lu  (卢喜瑞)

  3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China

    Xiaoli Wang

  4. School of High Energy Accelerator Science, Graduate University for Advanced Studies, Tsukuba, 240-0193, Japan

    Yanlin Wu

Authors
  1. Xirui Lu  (卢喜瑞)
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  2. Mengjun Chen
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  3. Faqin Dong
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  4. Xiaoli Wang
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  5. Yanlin Wu
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  6. Zhengxue Xiao
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Corresponding author

Correspondence to Xirui Lu  (卢喜瑞).

Additional information

Funded Partly by the Key Project of National High Technology Research and Development Program (863 Program) (No. 2009AA050703), the National Natural Science Youth Foundation of China (Nos. 41302028, 21007052), the Sichuan Province Science and Technology Support Program (No. 2011GZ0252) and the Joint Laboratory for Extreme Conditions Matter Properties, Southwest University Science and Technology and Research Center of Laser Fusion, China Academy of Engineering Physics (No. 12zxjk04)

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Lu, X., Chen, M., Dong, F. et al. Leaching stability of simulated waste forms for immobilizing An3+ by Gd2Zr2O7 with Nd3+ . J. Wuhan Univ. Technol.-Mat. Sci. Edit. 29, 885–890 (2014). https://doi.org/10.1007/s11595-014-1014-4

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  • DOI: https://doi.org/10.1007/s11595-014-1014-4

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