Determination of SO4β1 for yttrium and the rare earth elements at I = 0.66 m and t = 25°C—implications for YREE solution speciation in sulfate-rich waters

The experimental determination of REE partition coefficients in the water-calcite system

“…9 and Table 4. Note this extended equation (7) takes account of the REE complexes present in minor amounts in seawater (REECl + , REESO 4 + and REEOH 2+ ) as estimated using stability constants at zero ionic strength from Luo and Byrne (2001), Schijf and Byrne (2004) and Klungness and Byrne (2000), respectively. Furthermore as noted in section 2.1, the exchange reaction based on the formation of NaREE(CO3)2 can alternatively be expressed using the REECO 3 + or REE(CO 3 ) 2 − aqueous complexes, which leads to small variations in the calculated D REE for seawater as illustrated by the dashed curves in Fig.…”

Experimental study of rare earth element partitioning between calcite and sodium chloride solution at room temperature and pressure

“…The complex formation constant is generally defined by activities, but we used the complex formation constants based on molal concentration obtained experimentally at I = 0.7 and 25°C by Liu and Byrne (1998), Klungness and Byrne (2000), Schijf and Byrne (2004) and Luo and Byrne (2007). The complex formation constant (K A,n ) for the chemical reaction formula (Eq.…”

Rare earth element sorption onto hydrous manganese oxide: A modeling study

“…The SURFACE_MASTER_SPECIES data block defines a binding site, named "Hmo" (HMO; [16]), with two binding sites, "Hmo_w" and "Hmo_s", for the "weak" and "strong" binding sites. Inorganic speciation was then performed; the Nagra/PSI database [31] was used and updated including the same well-accepted stability constants at infinite dilution (25°C) for the REE inorganic complexes (hydroxide, sulfate and carbonate; [32][33][34]. As Bau and Koschinsky [35] proposed, Ce(III) is oxidized after its sorption onto oxyhydroxide and therefore only REE(III) were considered in the proposed SCM.…”