Radium Sorption to Iron (Hydr)oxides, Pyrite, and Montmorillonite: Implications for Mobility,Environmental Science & Technology

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Radium Sorption to Iron (Hydr)oxides, Pyrite, and Montmorillonite: Implications for Mobility
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-03-16 00:00:00 , DOI: 10.1021/acs.est.7b05443
Michael A. Chen ₁ , Benjamin D. Kocar ₁

Affiliation

Radium (Ra) is a radioactive element commonly found within soils, sediments, and natural waters. Elevated Ra activities arising through natural and anthropogenic processes pose a threat to groundwater resources and human health, and Ra isotope ratios are used to decipher groundwater movement, estimate submarine discharge flux, and fingerprint contamination associated with hydraulic fracturing operations. Although adsorption to metal (hydr)oxides and certain clay minerals is well established as a dominant mechanism controlling Ra transport and retention, the extent of Ra sorption to other minerals and under variable environmental conditions (e.g., pH and salinity) is limited. Accordingly, we present results of sorption studies and surface complexation modeling (SCM) of Ra to ferrihydrite, goethite, montmorillonite, and pyrite, for a range of pH values and common background cations. Ra sorption to all substrates is observed under geochemical conditions considered, but varies according to mineral, solution pH and specific competing cations. Literature derived SCMs for Ra sorption were fitted to match either sorption impacts due to pH or different background cations, but were not able to predict the impacts of different geochemical conditions. Despite this, the use of SCMs provided a more mechanistic understanding of Ra sorption as compared to commonly used distribution coefficients.

中文翻译：

镭对三氧化二铁，黄铁矿和蒙脱石的吸附：对流动性的影响

镭（Ra）是一种放射性元素，通常存在于土壤，沉积物和天然水中。自然和人为过程引起的Ra活度升高对地下水资源和人类健康构成威胁，并且Ra同位素比用于解释地下水运动，估算海底排放通量和与水力压裂作业有关的指纹污染。尽管已经很好地确定了对金属（氢）氧化物和某些粘土矿物质的吸附是控制Ra迁移和保留的主要机制，但是在各种环境条件（例如pH和盐度）下，Ra对其他矿物质的吸附程度受到限制。因此，我们介绍了Ra对三水铁矿，针铁矿，蒙脱土和黄铁矿的吸附研究和表面络合模型（SCM），用于一定范围的pH值和常见的背景阳离子。在考虑的地球化学条件下观察到Ra吸附到所有底物上，但会根据矿物质，溶液的pH值和特定竞争性阳离子而变化。适合于Ra吸附的文献衍生SCM可以匹配由于pH或不同背景阳离子引起的吸附影响，但无法预测不同地球化学条件的影响。尽管如此，与常用的分配系数相比，SCM的使用提供了对Ra吸附的更机械的理解。适合于Ra吸附的文献衍生SCM可以匹配由于pH或不同背景阳离子引起的吸附影响，但无法预测不同地球化学条件的影响。尽管如此，与常用的分配系数相比，SCM的使用提供了对Ra吸附的更机械的理解。适合于Ra吸附的文献衍生SCM可以匹配由于pH或不同背景阳离子引起的吸附影响，但无法预测不同地球化学条件的影响。尽管如此，与常用的分配系数相比，SCM的使用提供了对Ra吸附的更机械的理解。

更新日期：2018-03-16

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