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<p>The sorption and precipitation of Ra and Ba on crystalline rock was studied with batch sorption and precipitation experiments, and geochemical modeling. Following the precipitation experiments, (Ba,Ra)SO<sub>4</sub> experimental partition coefficient (<i>λ</i>) and RaSO<sub>4</sub>(s) solubility constant values were obtained. It was observed that especially in groundwaters of low overall salinity, and/or of high SO<sub>4</sub> and Ba content, Ra is strongly removed from the solution to both coprecipitation and sorption. A new geochemical model was developed which successfully interprets the experimental results. The precipitates of BaSO<sub>4</sub>(s) were directly observed with the rock minerals with a SEM/EDX analysis.</p>

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Radium and barium sorption and precipitation on crystalline rock; experimental results and modeling development

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月7日

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  • Otto Fabritius,
  • Xiaodong Li,
  • Tatiana Sorokina,
  • Anna-Maria Jakobsson,
  • Tiina Sojakka,
  • Marja Siitari-Kauppi

摘要

The sorption and precipitation of Ra and Ba on crystalline rock was studied with batch sorption and precipitation experiments, and geochemical modeling. Following the precipitation experiments, (Ba,Ra)SO4 experimental partition coefficient (λ) and RaSO4(s) solubility constant values were obtained. It was observed that especially in groundwaters of low overall salinity, and/or of high SO4 and Ba content, Ra is strongly removed from the solution to both coprecipitation and sorption. A new geochemical model was developed which successfully interprets the experimental results. The precipitates of BaSO4(s) were directly observed with the rock minerals with a SEM/EDX analysis.