RT Journal Article
T1 Gypsum Amendment Induced Rapid Pyritization in Fe-Rich Mine Tailings from Doce River Estuary after the Fundão Dam Collapse
A1 Ferreira, Amanda D.
A1 Queiroz, Hermano M.
A1 Kaneagae, Maira P.
A1 Nóbrega, Gabriel Nuto
A1 Otero Pérez, Xosé Lois
A1 Bernardino, Ângelo F.
A1 Ferreira, Tiago O.
K1 Sulfidation
K1 Pyrite
K1 Lead sulfide
K1 Soil remediation
K1 Chemical immobilization
AB Mine tailings containing trace metals arrived at the Doce River estuary, after the world’s largest mine tailings disaster (the Mariana disaster) dumped approximately 50 million m3 of Fe-rich tailings into the Doce River Basin. The metals in the tailings are of concern because they present a bioavailability risk in the estuary as well as chronic exposure hazards. Trace metal immobilization into sulfidic minerals, such as, pyrite, plays a key role in estuarine soils; however, this process is limited in the Doce River estuarine soil due to low sulfate inputs. Thus, to assess the use of gypsum amendment to induce pyritization in deposited tailings, a mesocosm experiment was performed for 35 days, with vinasse added as carbon source and doses of gypsum (as a sulfate source). Chemical and morphological evidence of Fe sulfide mineral precipitation was observed. For instance, the addition of 439 mg of S led to the formation of gray and black spots, an Fe2+ increase and decrease in sulfides in the solution, an increase in pyritic Fe, and a greater Pb immobilization by pyrite at the end of the experiment. The results show that induced pyritization may be a strategy for remediating metal contamination at the Doce River estuary
PB MDPI
YR 2021
FD 2021
LK http://hdl.handle.net/10347/24456
UL http://hdl.handle.net/10347/24456
LA eng
NO Minerals 2021, 11(2), 201; https://doi.org/10.3390/min11020201
NO This work was funded by grants to AFB and TOF from Fundação de Amparo do Espirito Santo (FAPES/CNPq/CAPES Rio Doce 77683544/2017), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior CAPES—Finance Code 001 and CNPq (grant numbers, AFB: 301161/2017-8, TOF: 305996/2018-5; GNN: 409593/2018-4). The authors are grateful for the financial support provided by São Paulo Research Foundation (FAPESP, ADF grant number 2019/14800-5, HMQ grant number 2018/04259-2; MPK grant number 2020/06224-1; TOF grant numbers 2019/19987-6 and 2018/08408-2). Xunta de Galicia-Consellería de Educación e Ordeanción Universitaria de Galicia (Consolidation of competitive groups of investigation; GRC GI 1574) and CRETUS strategic group (AGRUP2015/02). Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (GNN, JCNE Grant E-26/202.757/2019)
DS Minerva
RD 24 abr 2026