RT Journal Article
T1 Stability of naturally occurring AMD–schwertmannite in the presence of arsenic and reducing agents
A1 Antelo Cortizas, Juan Manuel
A1 Fiol López, Sarah
A1 Carabante, Ivan
A1 Arroyo, Arantxa
A1 Lezama-Pacheco, Juan S.
A1 Josevska, Natasha
A1 Protopapa, Chloe
A1 Kumpiene, Jurate
K1 Acid mine drainage
K1 Arsenic
K1 Goethite
K1 Mineral stability
K1 Oxic and anoxic conditions
K1 Schwertmannite
AB Secondary iron oxides formed in acid mine drainage, such as schwertmannite, are scavengers for metal(loid)s in mining environments. Increasing the understanding of the geochemical transformations of these minerals, as well as knowing how metal(loid)s affect these transformations, is crucial to ultimately predict the fate of these trace elements in acidic mine drainage and to minimize the potential environmental risk. In this study, transformation experiments have been conducted with a schwertmannite-rich sediment collected from a mining area and with synthesized schwertmannite as a reference material. The transformation of schwertmannite into goethite was studied as a function of the presence of arsenic, pH value, and redox conditions. Arsenic delayed the mineral transformation from pseudo-stable amorphous phases to more stable crystalline forms, especially at higher arsenic loadings and more acidic pH. Experiments in the presence of Fe(II) and ascorbic acid have proven that both components promote the mineral transformation or reductive dissolution of schwertmannite under anoxic conditions. The presence of arsenic reduced the catalytic effect of Fe(II), stabilizing the schwertmannite particles. On the other hand, arsenic had no effect on the reductive dissolution at these conditions when ascorbic acid was used as a reducing agent.
PB Elsevier
SN 03756742
YR 2021
FD 2021-01
LK https://hdl.handle.net/10347/41020
UL https://hdl.handle.net/10347/41020
LA eng
NO Journal of Geochemical Exploration Volume 220, January 2021, 106677
NO Åforsk and Wallenberg Foundation
NO Stanford Synchrotron Radiation Lightsource
NO Xunta de Galicia (Consolidation of competitive groups of investigation; GRC GI 1574)
NO Xunta de Galicia (CRETUS-Institute, ED431E_2018/01)
DS Minerva
RD 23 abr 2026