Pyritization of trace metals in mangrove sediments

Andrade, Rayle Monteiro; Sanders, Christian J.; Boaventura, Géraldo Resende; Patchineelam, Sambasiva R.

doi:10.1007/s12665-012-1620-4

Cited by 21 publications

(9 citation statements)

References 11 publications

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“…However, we hypothesize that processes of release and immobilization of zinc (e.g., in the different Fe-minerals phases within mangrove rhizospheres; Clark et al, 1998;Marchand et al, 2006) could result in significant isotopic fractionation within mangrove sediments. During anoxic conditions (e.g, during high tides), Fe-oxyhydroxides are partially reduced and the insoluble iron and trace elements sulfides are formed, as driven by microbial activity (Huerta-Diaz and Morse, 1992; Andrade et al, 2012). In turn, insoluble sulfide phases are partly oxidized during oxic conditions (e.g, during low tides), resulting in the partial release of trace metals to pore water or in the immobilization of these elements in Fe-oxyhydroxides (Lacerda et al, 1993;Otte et al, 1995;Purnobasuki and Suzuki, 2005;Marchand et al, 2011;Zhou et al, 2011;Machado et al, 2014).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Tracing of anthropogenic zinc sources in coastal environments using stable isotope composition

et al. 2017

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The use of zinc isotopes to trace anthropogenic sources in coastal areas has been tested in this study. We determined the stable isotopic composition of zinc in sediment cores, suspended particulate matter (SPM) and rocks collected at the Sepetiba Bay (southeastern Brazil), an estuarine lagoon heavily impacted by metallurgic activities.These isotopic signatures were compared with those from willemite ore, which represent the main mineral refined by the major industrial source of zinc. The aim was to test if this tracer system enables to identify sources and sinks of anthropogenic zinc and to reconstruct the temporal and spatial evolution of zinc contamination. can be useful to improve environmental monitoring efforts in coastal systems.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Tracing of anthropogenic zinc sources in coastal environments using stable isotope composition

et al. 2017

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“…Suspended particles enriched in Zn as well as dissolved Zn are transported from the hot spot area throughout the bay and deposited in the tidal flats and mangroves along the shore (Leal Neto et al 2006;Roncarati and Carelli, 2012). There, dissolved metal contaminants including Zn and suspended particles are immobilized within organic-rich and anoxic sediment due to the formation of insoluble metallic sulfides and complexes with organic matter (Machado et al, 2008;Andrade et al, 2012;Ribeiro et al, 2013). This metal trapping capacity likely explains the moderate to high concentrations of Zn in stations B and C, even though the latter station is located as far as 16 km from the old electroplating plant.…”

Section: Tracing Anthropogenic Zinc Sources In the Mangrove Sedimentsmentioning

confidence: 99%

“…In anoxic conditions (e.g., during high tides), Fe-oxyhydroxides are partially reduced and dissolved releasing metals into solution, while sulfides produced from the microbial activity immobilize metals. During oxic conditions, sulfides may be oxidized releasing metals to pore-or column water (Huerta-Diaz and Morse, 1992;Marchand et al, 2011;Andrade et al, 2012;Machado et al, 2014). Previous mineralogical analyses (XRD) of the mangrove sediments in Sepetiba bay showed presence of ankerite (Ca(Fe,Mg,Mn)(CO 3 ) 2 ) and pyrite, evidencing an intense redox cycling of Fe and Mn during diagenetic processes involving carbon-iron-sulfur interactions and microbial metabolism (Araújo et al, 2017d).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Zinc isotopes as tracers of anthropogenic sources and biogeochemical processes in contaminated mangroves

Araújo

Machado

Weiß

et al. 2018

Applied Geochemistry

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Recent work has shown that variations in zinc (Zn) isotope ratios enable us to identify contamination sources in the terrestrial environment and uptake processes in higher plants. Here in this study, we demonstrate that this also holds true for mangrove forests, which play an important role in the biogeochemical cycling of metals in tropical coastal ecosystems and that are seriously threatened by anthropogenic pollution. To this end, we determined zinc concentration and isotope composition (expressed using the δ66Zn notation relative to the JMC 3-0749-L standard) in sediments and tree leaves collected from a mangrove close to Rio de Janeiro in Brazil. The δ66ZnJMC values of sediments vary between +0.36 and + 0.84‰ and fall on a mixing line between detrital terrestrial sources (characterized with δ66ZnJMC = +0.28 ± 0.12‰, 2σ) and metallurgical ore sources (δ66ZnJMC = +0.86‰ ±0.15‰, 2σ). Leaves of Laguncularia racemose, in contrast, showed δ66ZnJMC values ranging between +0.08 and + 0.23‰, suggesting that processes including uptake, translocation and bioavailability in the rhizosphere control the isotope composition of zinc in the mangrove plant. Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

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“…The mineral pyrite (FeS 2 ) is widely known for its potential for metal immobilization in coastal wetland soils [1][2][3][4]. The formation of pyrite in soils is controlled by edaphic factors such as iron (Fe) and sulfide concentration in soil solutions, soil organic matter, microbial activity, redox potential (Eh), pH, soil moisture [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…According to the US Environmental Protection Agency (EPA) toxicity classifications, soils at River Doce estuary can be classified as highly polluted with Pb (Table 1) since the concentration of this toxic element in the estuarine mine tailing deposits is 48.8% higher than the threshold effect level (TEL) (35 mg kg −1 ) [19]. Lead (Pb) poisoning is a global concern and sulfidation of Pb is a relevant sink [4] because Pb is a metallic ion from "class B" or "soft sphere" and has a high affinity for forming strong soluble complexes with bisulfides and polysulfides [4]. Thus, improving pyritization through sulfur amendment is a useful strategy for inducing pedogenetic processes (i.e., sulfidation), and forming a Technosol, which can provide valuable ecosystem services, such as metal contamination remediation.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Pyritization of trace metals in mangrove sediments

Cited by 21 publications

References 11 publications

Tracing of anthropogenic zinc sources in coastal environments using stable isotope composition

Tracing of anthropogenic zinc sources in coastal environments using stable isotope composition

Zinc isotopes as tracers of anthropogenic sources and biogeochemical processes in contaminated mangroves

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

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