Assessment of surface area normalisation for interpreting distribution coefficients (Kd) for uranium sorption

Trench ‘Bathtubbing’ and Surface Plutonium Contamination at a Legacy Radioactive Waste Site

“…Compared to the local soils, the creek sediments include greater amounts of fine organic and inorganic materials, which can often concentrate contaminants, due in part to their higher surface area per unit volume. 5,26 It is therefore possible that the sediments contain traces of Pu contamination from the LFBG wastes, and further isotopic studies (particularly 239 Pu/ 240 Pu ratios) will be needed to determine whether part of their Pu content was derived from the LFBG source as well as from fallout.…”

Sorption coefficients and molecular mechanisms of Pu, U, Np, Am and Tc to Fe (hydr)oxides: A review

“…Mahoney et al [65] re-evaluated uranyl sorption onto hydrous ferric oxide using the diffuse layer model database. Payne et al [66] proposed the assessment of surface area normalization for interpreting distribution coefficient (K d ) for uranium sorption.…”

“…In systems with CO 2 or carbonate ligand, uranyl carbonate and hydrocarbonate complexes occur at pH 4 and become dominant at higher pH, although the calculated U complexes may vary slightly between different model calculations [51,57,59,64,66]. It has been reported that it is necessary to slightly vary the intrinsic constants for sorption of the di-and tri-carbonate complexes to fit the uranyl sorption data at a total carbonate concentration of 10 −2 and 10 −3 M [59].…”

Literature Review on the Sorption of Plutonium, Uranium, Neptunium, Americium and Technetium to Corrosion Products on Waste Tank Liners

“…Therefore, they proposed that the dominant surface complex in CO 2 -free systems is a C2 , which can form on the dominant {101} surface (Figure 7). In the systems with CO 2 or carbonate ligand, uranyl carbonate and hydrocarbonate complexes occur at pH 4 and become dominant at higher pH (Figure 8), although the actual U complexes may be slightly different from different model calculations (Hsi and Langmuir 1985, Waite et al 1998, Payne 1999, Sherman et al 2008, Payne et al 2011. It was necessary to slightly vary the intrinsic constants for sorption of the di-and tricarbonate complexes to fit the uranyl sorption data at a total carbonate concentration of 10 -2 and 10 -3 M (Hsi and Langmuir 1985).…”