Chemical and physical characterization of suspended particles and colloids in waters from the Osamu Utsumi mine and Morro do Ferro analogue study sites, Poços de Caldas, Brazil
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Precipitation sequence of fracture-filling calcite in fractured granite and changes in the fractionation process of rare earth elements and yttrium
2022, Chemical GeologyCitation Excerpt :Confidence in long-term model predictions can be enhanced by checking against observations from natural geological systems (“natural analogues”), where processes relevant to radioactive waste disposal have operated over comparably long timescales (i.e., thousands to millions of years). Rare earth elements (REE), particularly light REE, can be studied as analogues of certain trivalent actinides (e.g., Am3+, Cm3+, Cf3+, and Pu3+) in the natural environment because of their identical valence and similar ionic radii (Johannesson and Hendry, 2000; Stipp et al., 2006; Wood, 1990), as well as representing analogues for REE fission products (e.g., Ce-144, Pm-147 and Eu-154) (Miekeley et al., 1992). Yttrium also forms a trivalent cation that exhibits similar geochemical behavior and is commonly discussed along with the REE (Mathurin et al., 2014; Möller and De Lucia, 2020; Qin et al., 2020).
Testing repository safety assessment models for deep geological disposal using legacy contaminated sites
2021, Science of the Total EnvironmentPore water colloid properties in argillaceous sedimentary rocks
2016, Science of the Total EnvironmentCitation Excerpt :The rocks were predominantly carbonatite with layers deeply weathered to laterites. As its name suggests, Morro do Ferro is characterised by magnetite dikes and breccia with hydraulic conductive zones (Holmes et al., 1991; Miekeley et al., 1992). Partially metamorphosed and non-metamorphosed sedimentary rocks were also considered.
Ground water colloid properties from the Bangombé system
2014, Applied GeochemistryCitation Excerpt :These fractions are, however, larger for Ln’s and Pb; the latter being specifically strongly sorbed with specific ternary surface complex formation. These trace element associations on colloids are considerably lower in the surface waters from the Osamu Utsumi uranium mine in Poços de Caldas (Miekeley et al., 1992), which has a low pH and high sulphate content. Deeper, the higher pH and concentrations of suspended particles in ground waters (<0.5 mg l−1) allow these particles to carry a minor fraction of U and the Ln’s (<10% of the total concentrations in unfiltered ground waters, see Table 5).
Scavenging and immobilization of trace contaminants by colloids in the waters of abandoned ore mines
2003, Colloids and Surfaces A: Physicochemical and Engineering AspectsCitation Excerpt :Colloids are ubiquitous in mine waters (see for instance [1–4]).