The Behavior of Rhenium and Osmium in Hydrothermal Solutions: An Experimental Reconnaissance Study

本提案旨在通过一系列在广泛的严格约束条件下进行的侦察溶解度实验来解决水热溶液中Re和Os行为数据缺乏的问题。该研究有以下目标：1)确定Re和o最易溶解的条件，并对它们可能在自然界中移动的条件进行限制；2)获得关于溶液中主要溶解金属种类性质的初步证据（如氯化物配合物、二硫化物配合物、氧阴离子）；3)确定进一步实验的可行性，以获得详细的化学计量学和热力学数据。如果成功的话，这项研究的结果将在协助解释各种地质环境中的Re-Os系统方面具有巨大的价值。此外，由于铼和锝在地球化学上具有很强的相似性，了解铼的溶解度可能与评价这种长寿命放射性核素在深埋核废料储存库近场环境中的迁移有关。

9614773 Wood This proposal aims to address the lack of data on the behavior of Re and Os in hydrothermal solutions with a series of reconnaissance solubility experiments to be conducted under a broad range of carefully constrained conditions. The study has the following objectives: 1) determine those conditions under which Re and Os are most soluble and place constraints on the conditions under which they might be mobile in nature; 2) obtain preliminary evidence as to the nature of the predominant dissolved metal species in solution (e.g., chloride complex, bisulfide complex, oxyanion); 3) determine the feasibility of further experimentation designed to obtain detailed stoichiometric and thermodynamic data. If successful, the results of this study could be of immense value in assisting in the interpretation of Re-Os systematics in a variety of geological environments. Furthermore, owing to the strong geochemical similarities between rhenium and technicium, knowledge of Re solubilities could be relevant to the evaluation of migration of this long-lived radionuclide in the near-field environment of deeply buried nuclear waste repositories.