Geochemical and microbial responses to limestone and peat treatment of incubated hypermonosulfidic sediments DOI Creative Commons
Liubov Kononova, Anders Johnson, Sten Engblom

et al.

European Journal of Soil Science, Journal Year: 2024, Volume and Issue: 76(1)

Published: Dec. 27, 2024

Abstract Fine‐grained hypermonosulfidic sediments are widespread on the coastal plains of northern Baltic Sea that when drained, cause formation and dispersion acid toxic‐metal species. In this study, a 30‐month laboratory oxidation experiment with such sediment was performed in incubation cells. To minimize or prevent acidification, limestone applied two grain sizes: agricultural particles were all <3.15 mm half them <0.80 mm, fine‐grained median size 2.5 μm. The amount corresponded to theoretical acidity contained sulfides, as well four times amount. Another treatment included addition peat low dose test its effects immobilizing sufhur metals. pH drainage water solid phase decreased <4.0 control, <5.0 coarse‐grained low‐limestone treatment, but remained near‐neutral other treatments. Hence, effectively hindered contrast amounts corresponding potential held sulfides. treatments further overall rate pyrite oxidation, slowed down movement front, strongly minimized dissolved solid‐phase labile Al, caused gypsum more secondary Fe(III) phases than Fe formed control. also shifts 16S rRNA gene‐based microbial communities, where control developed acidophilic iron sulfur oxidizing communities promoted metal release. Instead, limestone‐treated unacidified incubations tolerance neutrophilic oxidizers sulfate without results showed have several biogeochemical effects, using amendment favourable terms minimizing

Language: Английский

Microbially Enhanced Growth and Metal Capture by Ferromanganese Concretions in a Laboratory Experiment DOI

Renata Majamäki,

Joonas Wasiljeff, Lotta Purkamo

et al.

Geobiology, Journal Year: 2025, Volume and Issue: 23(1)

Published: Jan. 1, 2025

ABSTRACT The growth and metal enrichment of ferromanganese minerals on the seafloor have intrigued many studies, yet role microbes in process has remained elusive. Here, we assessed microbial influence trace accumulation release concretions from Baltic Sea using 12‐week microcosm incubation experiments. We studied three concretion morphotypes: Crust, discoidal, spheroidal, with biotic abiotic treatments. samples were collected into bottles containing artificial brackish seawater Gulf Finland, incubated in‐situ simulating conditions, sampled at beginning end experiment. Microscale X‐ray‐computed tomography confirmed local up to 10 μm thick patches surface during period, corresponding a rate 0.04 mm/year. Scanning electron microscopy glass slides microcosms revealed freshly precipitated cauliflower‐like grains, typical formed Fe‐ Mn‐hydroxides. Decreased concentrations dissolved metals (Mn, Fe Co, V, Ni, Zn, Mo) solutions indicated these elements microcosms. In contrast, dissolution was observed microcosms, confirming that activity enhanced precipitation associated P ambient solution. contribution by strong decrease headspace methane further indicating presence active methanotrophs communities.

Language: Английский

Citations

0
Redox-Driven Formation of Mn(III) in Ice DOI Creative Commons
Tao Chen, Tra My Bui Thi, Tao Luo

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 17, 2024

Redox-driven reactions involving Mn(II) species adsorbed at Mn(IV) oxide surfaces can release Mn(III) in the form of dissolved Mn(III)-ligand natural waters. Using pyrophosphate (PP) as a model ligand, we show that freezing accelerates and enhances formation Mn(III)-PP complexes. This freeze-promoted reaction is explained by concentration oxides solutes (Mn(II), Na

Language: Английский

Citations

2
Electron transfer at birnessite/organic compound interfaces: mechanism, regulation, and two-stage kinetic discrepancy in structural rearrangement and decomposition DOI
Huan Ye, Zhaoyang Hu, Rongzhang Yin

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 1, 2024

Language: Английский

Citations

2
Geochemical and microbial responses to limestone and peat treatment of incubated hypermonosulfidic sediments DOI Creative Commons
Liubov Kononova, Anders Johnson, Sten Engblom

et al.

European Journal of Soil Science, Journal Year: 2024, Volume and Issue: 76(1)

Published: Dec. 27, 2024

Abstract Fine‐grained hypermonosulfidic sediments are widespread on the coastal plains of northern Baltic Sea that when drained, cause formation and dispersion acid toxic‐metal species. In this study, a 30‐month laboratory oxidation experiment with such sediment was performed in incubation cells. To minimize or prevent acidification, limestone applied two grain sizes: agricultural particles were all <3.15 mm half them <0.80 mm, fine‐grained median size 2.5 μm. The amount corresponded to theoretical acidity contained sulfides, as well four times amount. Another treatment included addition peat low dose test its effects immobilizing sufhur metals. pH drainage water solid phase decreased <4.0 control, <5.0 coarse‐grained low‐limestone treatment, but remained near‐neutral other treatments. Hence, effectively hindered contrast amounts corresponding potential held sulfides. treatments further overall rate pyrite oxidation, slowed down movement front, strongly minimized dissolved solid‐phase labile Al, caused gypsum more secondary Fe(III) phases than Fe formed control. also shifts 16S rRNA gene‐based microbial communities, where control developed acidophilic iron sulfur oxidizing communities promoted metal release. Instead, limestone‐treated unacidified incubations tolerance neutrophilic oxidizers sulfate without results showed have several biogeochemical effects, using amendment favourable terms minimizing

Language: Английский

Citations

0