Sequestration and oxidation of heavy metals mediated by Mn (II) oxidizing microorganisms in the aquatic environment
Y Huang, X Huangfu, C Ma, Z Liu - Chemosphere, 2023 - Elsevier
Microorganisms can oxidize Mn (II) to biogenic Mn oxides (BioMnOx), through enzyme-
mediated processes and non-enzyme-mediated processes, which are generally considered …
mediated processes and non-enzyme-mediated processes, which are generally considered …
Biogeochemical cycle of chromium isotopes at the modern Earth's surface and its applications as a paleo-environment proxy
Chromium (Cr) is a redox-sensitive metal element with two natural oxidation states,
commonly as the soluble Cr (VI) oxyanion (CrO 4 2− or HCrO 4−) and the insoluble Cr (III) …
commonly as the soluble Cr (VI) oxyanion (CrO 4 2− or HCrO 4−) and the insoluble Cr (III) …
Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen
The history of atmospheric oxygen through the Mesoproterozoic Era is uncertain, but may
have played a role in the timing of major evolutionary developments among eukaryotes …
have played a role in the timing of major evolutionary developments among eukaryotes …
Strong evidence for a weakly oxygenated ocean–atmosphere system during the Proterozoic
C Wang, MA Lechte, CT Reinhard… - Proceedings of the …, 2022 - National Acad Sciences
Earth's surface has undergone a protracted oxygenation, which is commonly assumed to
have profoundly affected the biosphere. However, basic aspects of this history are still …
have profoundly affected the biosphere. However, basic aspects of this history are still …
Enrichment and speciation of chromium during basalt weathering: Insights from variably weathered profiles in the Leizhou Peninsula, South China
SS Sun, M Ao, KR Geng, JQ Chen, JJ Li… - Science of the Total …, 2022 - Elsevier
Basalt-derived soils are widespread worldwide. Such soils contain high levels of heavy
metals like chromium (Cr), which is a serious environmental concern. However, little is …
metals like chromium (Cr), which is a serious environmental concern. However, little is …
Modern rather than Mesoarchaean oxidative weathering responsible for the heavy stable Cr isotopic signatures of the 2.95 Ga old Ijzermijn iron formation (South …
Previously reported stable Cr isotopic fractionation in Archaean paleosols and iron
formations (IFs) have been interpreted as a signature of oxidative weathering of Cr (III) to Cr …
formations (IFs) have been interpreted as a signature of oxidative weathering of Cr (III) to Cr …
Release of chromium from Cr (III)-and Ni (II)-substituted goethite in presence of organic acids: Role of pH in the formation of colloids and complexes
S Sun, T Deng, M Ao, Y Mo, J Li, T Liu, W Yang… - Science of The Total …, 2023 - Elsevier
High levels of Cr (III) are hosted in Fe (oxyhydr) oxides in soils derived on (ultra) mafic rocks,
which can pose potential risks to the environment. Organic acids can cause the …
which can pose potential risks to the environment. Organic acids can cause the …
Mesoproterozoic oxygenation event: From shallow marine to atmosphere
Oxygen availability is crucial for the evolution of eukaryotes in geological history, but the
redox conditions of the mid-Proterozoic atmospheric-oceanic system remain vigorously …
redox conditions of the mid-Proterozoic atmospheric-oceanic system remain vigorously …
A transient swing to higher oxygen levels in the atmosphere and oceans at~ 1.4 Ga
Abstract The mid-Proterozoic (1.8–0.8 Ga) may have witnessed persistent and predominant
anoxia at the Earth's surface. However, recent studies suggest that there was a period …
anoxia at the Earth's surface. However, recent studies suggest that there was a period …
NOM-Induced Dissolution of CrxFe1–x(OH)3 Precipitates and Formation of Cr(III)-NOM-Fe Colloids under Oxic and Anoxic Conditions
Mixed Cr (III)–Fe (III)(hydr) oxides (Cr x Fe1–x (OH) 3) are common reduction products of Cr
(VI) that have long been considered as the sink of Cr in subsurface environments. While …
(VI) that have long been considered as the sink of Cr in subsurface environments. While …