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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Gypsum Amendment Induced Rapid Pyritization in Fe-Rich Mine Tailings from Doce River Estuary after the Fundao Dam Collapse

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Ferreira, Amanda D. [1] ; Queiroz, Hermano M. [1] ; Kaneagae, Maira P. [1] ; Nobrega, Gabriel N. [2] ; Otero, Xose L. [3] ; Bernardino, Angelo F. [4] ; Ferreira, Tiago O. [1]
Total Authors: 7
[1] Univ Sao Paulo, Coll Agr Luiz Queiroz, Dept Soil Sci, ESALQ, USP, Av Padua Dias 11, BR-13418 Piracicaba, SP - Brazil
[2] Fed Fluminense Univ, Grad Program Geosci Geochem, Dept Geochem, Outeiro Sao Joao Batista S-N, Campus Valonguinho, BR-24020 Niteroi, RJ - Brazil
[3] Univ Santiago de Compostela, Fac Biol, Dept Edaphol & Agr Chem CRETUS, Campus Sur, Santiago De Compostela 15782 - Spain
[4] Univ Fed Espirito Santo, Dept Oceanog, Grp Ecol Benton, BR-29075910 Vitoria, ES - Brazil
Total Affiliations: 4
Document type: Journal article
Source: MINERALS; v. 11, n. 2 FEB 2021.
Web of Science Citations: 4

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 m(3) 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. (AU)

FAPESP's process: 19/14800-5 - Estuarine plants and their control in metals biogeochemistry in soils impacted by the `Mariana disaster´
Grantee:Amanda Duim Ferreira
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 19/19987-6 - Soils and plants of the Rio Doce estuary controlling the biogeochemistry of iron and metals in response to the Mariana (MG) disaster
Grantee:Tiago Osório Ferreira
Support Opportunities: Regular Research Grants
FAPESP's process: 18/04259-2 - Iron biogeochemistry and its control on dynamics of trace metals in the soils of Doce River estuary after the "Mariana disaster"
Grantee:Hermano Melo Queiroz
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/08408-2 - Comparative studies of the mineral transformation of iron oxide nanoparticles in mine-tailing affected sediments and soils and their impacts on mobilization and fixation of heavy metals under two contrasting redox environments
Grantee:Tiago Osório Ferreira
Support Opportunities: Regular Research Grants
FAPESP's process: 20/06224-1 - River Doce estuary soil remediation through metals immobilization through pyritization with gypsum and vinasse
Grantee:Maíra Pereira Kanegae
Support Opportunities: Scholarships in Brazil - Scientific Initiation