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<p>This study investigates the speciation of Americium (Am) in deep groundwater at Xinchang, Gansu, using the latest thermodynamic data. Simulation results show that Am predominantly exists in the lower valence state of Am(III), with Am(CO<sub>3</sub>)<sub>2</sub><sup>−</sup>, Am(CO<sub>3</sub>)<sub>3</sub><sup>3−</sup>, and AmCO<sub>3</sub><sup>+</sup> as the major species. pH significantly affects Am speciation, with different species dominating at various pH levels. Temperature also influences speciation, with crystalline AmOCl increasing at higher temperatures. Additionally, F<sup>−</sup> and HCO<sub>3</sub><sup>−</sup> have a stronger effect on Am species than Cl<sup>−</sup> and SO<sub>4</sub><sup>2−</sup>. These findings are essential for understanding the behavior of HLWs in groundwater and supporting safe disposal site selection.</p>

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Geochemical dynamics of Americium speciation in deep groundwater from Xinchang, Beishan, Gansu Province of China: implications for safe disposal of high-level radioactive wastes (HLWs)

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Zhenping Tang,
  • Wenting Bi,
  • Xianzhe Duan,
  • Nan Li,
  • Jiale Dou,
  • Peng Wu,
  • Jiawei Wang,
  • Bingqing Shao,
  • Jinxuan Shao,
  • Mengdie Zhang

摘要

This study investigates the speciation of Americium (Am) in deep groundwater at Xinchang, Gansu, using the latest thermodynamic data. Simulation results show that Am predominantly exists in the lower valence state of Am(III), with Am(CO3)2−, Am(CO3)33−, and AmCO3+ as the major species. pH significantly affects Am speciation, with different species dominating at various pH levels. Temperature also influences speciation, with crystalline AmOCl increasing at higher temperatures. Additionally, F− and HCO3− have a stronger effect on Am species than Cl− and SO42−. These findings are essential for understanding the behavior of HLWs in groundwater and supporting safe disposal site selection.