在含有NaCl的碳酸盐溶液中,PuCO3OH(cr) 的可溶性,特异化和热力学
Philipp Müller1, David Fellhauer1, Dieter Schild1
1Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany.
Angewandte Chemie (International ed. in English)
|October 25, 2025
概括
三价 (Pu(III)) 溶解性在近中性,富含碳酸盐的溶液中进行了研究. 当被PuCO3OH(cr控制时,的平衡度显著降低,这表明的稳定性得到了提高.
科学领域:
- 放射化学 放射化学是指辐射化学.
- 环境地质化学环境地质化学
- 核化学 核化学 核化学
背景情况:
- 三价 (Pu(III)) 在自然和人工系统中的行为对于核废物管理至关重要.
- 了解III的水性物种化和固态形成对于预测其环境命运至关重要.
- 关于含有碳酸盐的近中性pH值溶液中Pu (III) 溶解度和物种化的数据有限.
研究的目的:
- 为了研究的可溶性,水性物种化和固相形成,在接近中性的pH值下,0.10 M NaCl与碳酸盐溶液.
- 合成和表征晶体PuCO3OH ((cr) 并确定其可溶性产物.
- 评估控制Pu (III) 在这些条件下的热力学常数,用于地球化学建模.
主要方法:
- 使用包括VIS/NIR光谱,SEM/EDX,粉末XRD,瑞特维尔德分析和Pu L3-边缘EXAFS.使用的技术合成和表征晶体PuCO3OH(cr).
- 在90天内进行的批量溶解性实验中,在0.10M NaCl-Na2CO3 溶液中用PuCO3OH (((cr) 在各种pH值范围内进行了批量溶解性实验.
- 化学模型的开发,以评估基于实验可溶性数据的热力学常数.
主要成果:
- 晶体PuCO3OH ((cr) 已成功合成和表征.
- 通过PuCO3OH (cr) 控制的Pu (III) 均衡度比通过Pu (OH) 3 (am) 控制的度低多达三级.
- 在含有碳酸盐的水溶液中观察到Pu (III) 的显著稳定,并评估了热力学常量.
结论:
- 在接近中性,富含碳酸盐的环境中,PuCO3OH (cr) 显著降低了Pu (III) 的溶解度.
- 这些发现对于改善与核废物存储库和环境系统相关的地化学模型至关重要.
- 这项研究为了解和管理环境中的提供了必要的数据.
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