A method to investigate the interaction of rare earth elements in aqueous solution with metal oxides

An iron shuttle for deepwater silica in Late Archean and early Paleoproterozoic iron formation

“…How, for example, might such a process affect the fractionation of both rare earth elements (e.g., Köppenkastrop et al, 1991) and Ge relative to Si (e.g., Hammond et al, 2000;Anders et al, 2003;Pokrovsky et al, 2006), and does this require reinterpretation of geochemical proxies? Also, how does silica adsorption affect rates and mechanisms of biological iron reduction?…”

Sorption of yttrium and rare earth elements by amorphous ferric hydroxide: Influence of solution complexation with carbonate

“…Since YREE solution chemistry has been relatively well characterized (see for instance Wood, 1990;Byrne and Sholkovitz, 1996), recent studies of YREE fractionation processes have focused on YREE surface chemistry. Early investigations of REE sorption in seawater utilized radiotracers and a variety of substrates, both organic (Bingler et al, 1989;Byrne and Kim, 1990;Stanley and Byrne, 1990) and inorganic (Byrne and Kim, 1990;Koeppenkastrop et al, 1991). These studies showed that for most substrates, light REEs (LREEs) are preferentially removed from seawater compared to heavy REEs (HREEs).…”

Diel behavior of rare earth elements in a mountain stream with acidic to neutral pH

“…For example, Trividi and Axe (2000) determined enthalpies of ϩ67 to ϩ105 kJ/mol for adsorption of Cd and Zn onto hydrous oxides of Al, Fe, and Mn. Koeppenkastrop (1992) examined the uptake of REE from seawater by FeOOH and MnO 2 solids at 2°C, 25°C, and 40°C and reported enthalpies of adsorption for Eu of ϩ24 to ϩ33 kJ/mol. Although these values are considerably lower than those obtained in our study, this could be attributed to differences between the chemistry of seawater and Fisher Creek, especially with respect to pH and carbonate ligand concentration.…”