Sorption of Sr(II) and Eu(III) onto pyrite under different redox potential conditions

XPS and XAS studies of copper(II) sorbed onto a synthetic pyrite surface

“…When increasing pH, the affinity of the pyrite surface for copper(II) increased. These data are consistent with the negativelycharged surface of pyrite even in very acidic conditions as previously measured for the present pyrite lot (isoelectric point < pH 2 [23]). …”

Comment on “Kinetics and thermodynamics of Eu(III) adsorption onto synthetic monoclinic pyrrhotite” by Y. Zhu et al., Journal of Molecular Liquids, 218 (2016), 565–570

“…The steeper part of the adsorption edge (starting around pH 5) coincides well with adsorption A c c e p t e d m a n u s c r i p t patterns of europium on other sulfide minerals, e.g. on non-oxidized pyrite uptake starts at pH 6, while on oxidized pyrite it starts at pH 4 [8]. Below pH 5 a different slope on the uptake curve occurs which might point to an additional/separate mechanism.…”

Submarine groundwater discharge is an important net source of light and middle REEs to coastal waters of the Indian River Lagoon, Florida, USA

“…We interpret this as preliminary evidence that REEs are not removed from advecting SGD to the same degree as Fe(II) by precipitating Fe-sulfides at the base of the black, marine sediments within the Indian River Lagoon subterranean estuary. This is not surprising as convincing evidence currently does not exists implicating sulfide mineral formation with REE removal from marine waters (Naveau et al, 2006; also see Schijf et al, 1995;DeCarlo et al, 1998;Chaillou et al, 2006). Nevertheless, without sediment data for the REEs, we cannot unequivocally address whether REEs are also removed with precipitating metal sulfides in Indian River Lagoon sediments.…”