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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.)

Short-term Fe reduction and metal dynamics in estuarine soils impacted by Fe-rich mine tailings

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Author(s):
Barcellos, Diego [1, 2] ; Queiroz, Hermano M. [2] ; Ferreira, Amanda D. [2] ; Bernardino, Angelo F. [3] ; Nobrega, Gabriel Nuto [4] ; Otero, Xose L. [5] ; Ferreira, Tiago O. [2]
Total Authors: 7
Affiliation:
[1] Fed Univ Sao Paulo UNIFESP, Dept Environm Sci, BR-09972270 Sao Paulo - Brazil
[2] Univ Sao Paulo ESALQ USP, Luiz de Queiroz Coll Agr, Dept Soil Sci, BR-13418900 Sao Paulo - Brazil
[3] Univ Fed Espirito Santo, Dept Oceanog, BR-29075910 Vitoria, ES - Brazil
[4] Fed Fluminense Univ, Dept Geochem, Grad Program Geosci Geochem, Outeiro Sao Joao Batista S-N, Campus Valonguinho, BR-24020 Niteroi, RJ - Brazil
[5] Univ Santiago de Compostela, Fac Biol, CRETUS Dept Edafoloxia & Quim Agr, Rua Lope G Marzoa S-N, Campus Sur, Santiago De Compostela 15782 - Spain
Total Affiliations: 5
Document type: Journal article
Source: APPLIED GEOCHEMISTRY; v. 136, JAN 2022.
Web of Science Citations: 0
Abstract

Rates of iron (Fe) reduction and oxidation greatly influence the release and retention of metals in redox-dynamic ecosystems such as estuaries. The fate of metals and Fe cycling operate in multiple timescales (days to years), but processes that occur from days to weeks have been poorly investigated, especially in estuarine soils contaminated with mine tailings. Here we tested the hypothesis that Fe reduction would increase rapidly (within days) when Fe-rich mining tailings are exposed to reducing conditions. Fe reduction is then expected to release metals bound/occluded into Fe oxyhydroxides to the estuarine system. We performed a laboratory incubation for 20 days, expositing estuarine soils to either anoxic or oxic conditions and analyzed HCl-extractable FeII and metals to test this hypothesis. We observed a rapid and significant increase in Fe reduction (FeII production) within 20 d under anoxic conditions, but no increase under oxic conditions. Also, during the 20-d of anoxia, a significant increase in the HCl-extractable metals was observed for Al (1.6 x ), Ba (1.4 x ), Cd (3.1 x ), Co (4.1 x ), Cr (2.6 x ), Cu (1.4 x ), Mn (6.1 x ), Ni (1.6 x ), Pb (1.7 x ), and Zn (3.6 x ), whereas no changes were observed in aerobic incubations. Accounting for the total pool of microbially-reducible Fe (i.e., the low-crystallinity or shortrange-ordered Fe phases), we estimated that the residence time for a potential release of metals ranged from 22 d for Mn to 121 d for Cr. Our results demonstrate the high speed of Fe biogeochemical cycling and metal dissociation in aquatic ecosystems impacted by upstream Fe-rich tailings. Our study also suggests that chronic contamination in these areas may persist for several months after the deposition of tailings and will likely persist with the continued arrival of tailings from the upstream river basin. (AU)

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: 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: 19/17413-2 - Redox processes controlling Fe oxide-associated metals dynamics in rio Doce estuary sediments after the Mariana dam disaster
Grantee:Hermano Melo Queiroz
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 19/02855-0 - Redox fluctuations, iron and heavy metals dynamics in soils from Rio Doce estuary after the "Mariana (MG) disaster": an experimental approach
Grantee:Diego Barcellos
Support Opportunities: Scholarships in Brazil - Post-Doctoral
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: 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