Influence of Fe2+-catalysed iron oxide recrystallization on metal cycling

Latta, Drew E.; Gorski, Christopher A.; Scherer, Michelle M.

doi:10.1042/bst20120161

Cited by 90 publications

(102 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The aqueous Fe(II) (Fe(II) aq )-induced phase transformation of iron (hydr)oxides is one of the most important reactions in the soil iron cycle and imposes great effects on the environmental behaviors of metals [1]. It was proposed in the 1980s that Fe(II) aq could catalyze the phase transformation of iron (hydr)oxides through electron transfer and atom exchange with structural Fe(III) (Fe(III) oxide ) [2].…”

Section: Introductionmentioning

confidence: 99%

Aqueous Fe(II)-Induced Phase Transformation of Ferrihydrite Coupled Adsorption/Immobilization of Rare Earth Elements

et al. 2018

View full text Add to dashboard Cite

Abstract:The phase transformation of iron minerals induced by aqueous Fe(II) (Fe(II) aq ) is a critical geochemical reaction which greatly affects the geochemical behavior of soil elements. How the geochemical behavior of rare earth elements (REEs) is affected by the Fe(II) aq -induced phase transformation of iron minerals, however, is still unknown. The present study investigated the adsorption and immobilization of REEs during the Fe(II) aq -induced phase transformation of ferrihydrite. The results show that the heavy REEs of Ho(III) were more efficiently adsorbed and stabilized compared with the light REEs of La(III) by ferrihydrite and its transformation products, which was due to the higher adsorptive affinity and smaller atomic radius of Ho(III). Both La(III) and Ho(III) inhibited the Fe atom exchange between Fe(II) aq and ferrihydrite, and sequentially, the Fe(II) aq -induced phase transformation rates of ferrihydrite, because of the competitive adsorption with Fe(II) aq on the surface of iron (hydr)oxides. Owing to the larger amounts of adsorbed and stabilized Ho(III), the inhibition of the Fe(II) aq -induced phase transformation of ferrihydrite affected by Ho(III) was higher than that by La(III). Our findings suggest an important role for the Fe(II) aq -induced phase transformation of iron (hydr)oxides in assessing the mobility and transfer behavior of REEs, as well as for their occurrence in earth surface environments.

show abstract

Section: Introductionmentioning

confidence: 99%

Aqueous Fe(II)-Induced Phase Transformation of Ferrihydrite Coupled Adsorption/Immobilization of Rare Earth Elements

et al. 2018

View full text Add to dashboard Cite

show abstract

“…However, the data suggest that, in contrast to the biotic system, the fractionation generated by reduction processes persists in the product due to limited isotopic exchange between U(IV) and U(VI). Uranium in all three valences states [U(VI), U(V), and U(IV)] was reported to be sequestered at the surface or within the bulk of the Fe-bearing mineral (32,33), precluding such exchange. This sequestration is also true for aqueous Fe(II)-mediated A B Fig.…”

Section: Discussionmentioning

confidence: 99%

Uranium isotopes fingerprint biotic reduction

Stylo

Neubert

Wang

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

137

153

View full text Add to dashboard Cite

Knowledge of paleo-redox conditions in the Earth’s history provides a window into events that shaped the evolution of life on our planet. The role of microbial activity in paleo-redox processes remains unexplored due to the inability to discriminate biotic from abiotic redox transformations in the rock record. The ability to deconvolute these two processes would provide a means to identify environmental niches in which microbial activity was prevalent at a specific time in paleo-history and to correlate specific biogeochemical events with the corresponding microbial metabolism. Here, we demonstrate that the isotopic signature associated with microbial reduction of hexavalent uranium (U), i.e., the accumulation of the heavy isotope in the U(IV) phase, is readily distinguishable from that generated by abiotic uranium reduction in laboratory experiments. Thus, isotope signatures preserved in the geologic record through the reductive precipitation of uranium may provide the sought-after tool to probe for biotic processes. Because uranium is a common element in the Earth’s crust and a wide variety of metabolic groups of microorganisms catalyze the biological reduction of U(VI), this tool is applicable to a multiplicity of geological epochs and terrestrial environments. The findings of this study indicate that biological activity contributed to the formation of many authigenic U deposits, including sandstone U deposits of various ages, as well as modern, Cretaceous, and Archean black shales. Additionally, engineered bioremediation activities also exhibit a biotic signature, suggesting that, although multiple pathways may be involved in the reduction, direct enzymatic reduction contributes substantially to the immobilization of uranium.

show abstract

“…goethite) can change in the presence of Fe 2+ under laboratory conditions, especially under advective flow conditions (Frierdich et al, 2011;Frierdich and Catalano, 2012). Ferrihydrite in particular has been shown to incorporate additional Cu and Zn during Fe 2+ catalyzed recrystallization, as reviewed by Latta et al (2012). From a Mn mineral perspective, it has been demonstrated in laboratory studies that Ni uptake by the Mn oxide birnessite is pH dependent, but also reversible, calling into question its use as a paleopH indicator (Peacock, 2009).…”

Section: Introductionmentioning

confidence: 99%

Iron mineral structure, reactivity, and isotopic composition in a South Pacific Gyre ferromanganese nodule over 4 Ma

Marcus

Edwards

Guéguen

et al. 2015

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Deep-sea ferromanganese nodules accumulate trace elements from seawater and underlying sediment porewaters during the growth of concentric mineral layers over millions of years. These trace elements have the potential to record past ocean geochemical conditions. The goal of this study was to determine whether Fe mineral alteration occurs and how the speciation of trace elements responds to alteration over 3.7 Ma of marine ferromanganese nodule (MFN) formation, a timeline constrained by estimates from 9 Be/ 10 Be concentrations in the nodule material. We determined Fe-bearing phases and Fe isotope composition in a South Pacific Gyre (SPG) nodule. Specifically, the distribution patterns and speciation of trace element uptake by these Fe phases were investigated. The time interval covered by the growth of our sample of the nodule was derived from 9 Be/ 10 Be accelerator mass spectrometry (AMS). The composition and distribution of major and trace elements were mapped at various spatial scales, using micro-X-ray fluorescence (lXRF), electron microprobe analysis (EMPA), and inductively coupled plasma mass spectrometry (ICP-MS). Fe phases were characterized by micro-extended X-ray absorption fine structure (lEXAFS) spectroscopy and micro-X-ray diffraction (lXRD). Speciation of Ti and V, associated with Fe, was measured using micro-X-ray absorption near edge structure (lXANES) spectroscopy. Iron isotope composition (d 56/54 Fe) in subsamples of 1-3 mm increments along the radius of the nodule was determined with multiplecollector ICP-MS (MC-ICP-MS). The SPG nodule formed through primarily hydrogeneous inputs at a rate of 4.0 ± 0.4 mm/Ma. The nodule exhibited a high diversity of Fe mineral phases: feroxyhite (d-FeOOH), goethite (a-FeOOH), lepidocrocite (c-FeOOH), and poorly ordered ferrihydrite-like phases. These findings provide evidence that Fe oxyhydroxides within the nodule undergo alteration to more stable phases over millions of years. Trace Ti and V were spatially correlated with Fe and found to be adsorbed to Fe-bearing minerals. Ti/Fe and V/Fe ratios, and Ti and V speciation, did not vary along the nodule radius. The d 56/54 Fe values, when averaged over sample increments representing 0.25-0.75 Ma, were homogeneous within uncertainty along the nodule radius, at 0.12 ± 0.07‰ (2sd, n = 10). Our results indicate that the Fe isotope composition of the nodule remained constant during nodule growth and that mineral alteration did not affect the primary Fe isotope composition of the nodule. Furthermore, the average d 56/54 Fe value of 0.12‰ we find is consistent with Fe sourced from continental eolian particles (dust). Despite mineral alteration, the trace element partitioning of Ti and V, and Fe isotope composition, do not appear to change within the sensitivity of our measurements. These findings suggest that Fe oxyhydroxides within hydrogenetic ferromanganese nodules are out of geochemical contact with seawater once they are covered by subsequent concentric mineral layers. Even though Febearing minerals are...

show abstract

Influence of Fe2+-catalysed iron oxide recrystallization on metal cycling

Cited by 90 publications

References 71 publications

Aqueous Fe(II)-Induced Phase Transformation of Ferrihydrite Coupled Adsorption/Immobilization of Rare Earth Elements

Aqueous Fe(II)-Induced Phase Transformation of Ferrihydrite Coupled Adsorption/Immobilization of Rare Earth Elements

Uranium isotopes fingerprint biotic reduction

Iron mineral structure, reactivity, and isotopic composition in a South Pacific Gyre ferromanganese nodule over 4 Ma

Contact Info

Product

Resources

About