Trapping of Cr by Formation of Ferrihydrite during the Reduction of Chromate Ions by Fe(II)−Fe(III) Hydroxysalt Green Rusts

Loyaux-Lawniczak, Stéphanie; Refait, Philippe; Ehrhardt, J.J.; Lecomte, P; Génin, J.‐M. R.

doi:10.1021/es9903779

Cited by 200 publications

(139 citation statements)

References 46 publications

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“…This is the case for reduction of selenate Se(VI) into Se(0) or Se(-II) (Myneni et al, 1997), Ag(I), Au(III), Cu(II) and Hg(II), respectively into Ag(0), Au(0), Cu(0) and Hg(0) (O'Loughlin et al, 2003) or Cr(VI) into Cr(III) (Loyaux-Lawniczak et al, 2000).…”

Section: Redox Reactivitymentioning

confidence: 99%

Fougerite a Natural Layered Double Hydroxide in Gley Soil: Habitus, Structure, and Some Properties

Trolard¹,

Bourrié²

2012

Clay Minerals in Nature - Their Characterization, Modification and Application

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Section: Redox Reactivitymentioning

confidence: 99%

Fougerite a Natural Layered Double Hydroxide in Gley Soil: Habitus, Structure, and Some Properties

Trolard¹,

Bourrié²

2012

Clay Minerals in Nature - Their Characterization, Modification and Application

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“…In addition, ferrous iron that is adsorbed under alkaline conditions is mobile under acidic conditions. Reduced sediment barriers can still be effective even under highly acidic conditions (pH 4.3) (Loyaux-Lawniczak et al 2000Jardine et al 1999;Anderson et al 1994) because immobile ferrous iron from 2:1 smectite clays or iron sulfides are the electron donors not adsorbed ferrous iron (Kim et al 2001, Patterson andFendorf 1997 which indicate that the conversion of one mole of nitrate to nitrite consumes two moles of electrons; one mole of nitrate to N 2 consumes four moles of electrons, and one mole of nitrate to ammonia consumes eight moles of electrons. So the reduced sediment barrier longevity can be significantly less with greater reduction of the nitrate.…”

Section: Sediment Oxidation By Dissolved Oxygen Chromate and Nitratementioning

confidence: 99%

Effect of Geochemical and Physical Heterogeneity on the Hanford 100D Area In Situ Redox Manipulation Barrier Longevity

Szecsody¹,

Vermeul²,

Fruchter³

et al. 2005

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Executive SummaryThe purpose of this study was to quantify the influence of physical and/or geochemical heterogeneities in the Hanford 100D area In Situ Redox Manipulation (ISRM) barrier that may be contributing to the discontinuous chromate breakthrough locations along the 65-well (2,300-ft-long) barrier. Chromate breakthrough has been observed in as many as 17 of the 70 ISRM injection wells. Breakthrough has occurred at various locations along the barrier length with, in many cases, adjacent wells indicating good barrier performance. In addition to this spatial variability, observed chromate concentrations over the degraded sections of the barrier also vary seasonally. There is widespread nitrate upgradient of the ISRM barrier (60 mg/L) and lower nitrate concentrations downgradient. A recent nitrate study showed that, while the presence of nitrate will decrease barrier longevity uniformly, it cannot account for specific locations of chromate breakthrough.Possible causes of chromate breakthrough that were investigated during this study include:• high hydraulic conductivity zones• zones of low reducible iron• high hydraulic conductivity zones with low reducible iron.This laboratory-scale investigation used geochemical and physical characterization data collected at 0.5-to 1-ft intervals from four borehole locations. The four characterization borings were 10 to 12 ft up-and downgradient of two existing ISRM injection wells that have seen high chromate breakthrough concentrations. Additional data collected over the past few years pertaining to the ISRM barrier were also used to interpret both redox and flow conditions and the lateral extent of these hydrogeologic and geochemical properties. Supplemental data used in this interpretation included electromagnetic borehole flow meter data, multilevel sampler data, core pictures, and previous reductive capacity measurements.Results of this laboratory study did not provide definitive support for any of the proposed hypotheses for explaining chromate breakthrough at the Hanford 100D Area ISRM barrier. While site characterization data indicate a significant degree of vertical variability in both physical and geochemical properties in the four boreholes investigated, lateral continuity of high-conductivity/low-reductive capacity zones was not observed. The one exception was at the water table, where there was some indication of low reductive capacity at all four boreholes, three of which also showed high-K zones near the water table. A lack of 1-D column data near the water table for two of the four boreholes made characterization of this effect at these locations less certain. If physical heterogeneity alone strongly influenced barrier oxidation (hypothesis 1), there should be an inverse correlation between zones of high hydraulic conductivity and the field reductive capacity, which was generally not supported by the data except at the water table and, to a lesser extent, isolated locations deeper in the profile. The average saturated hydraulic conductivity of the aquifer...

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“…They also have a significant impact on the mobility of some elements (O'Loughlin et al 2003) and are highly reactive to reducible inorganic and organic pollutants (Erbs et al 1999;Loyaux-Lawniczak et al 2000;Hansen et al 2001; Lee and Batchelor 2002;Bond and Fendorf 2003;Legrand et al 2004). Thus, GRs are believed to play a key role in the redox cycling of Fe and in the speciation of metals in anoxic sediments and groundwater.…”

Section: Introductionmentioning

confidence: 99%

Formation of Hydroxysulphate Green Rust 2 as a Single Iron(II-III) Mineral in Microbial Culture

Zegeye

Ona-Nguéma

Carteret

et al. 2005

Geomicrobiology Journal

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Although GR2(SO 2− 4 ) can be easily formed by abiotic synthesis, the biotic formation of hydroxysulphate as a single iron(II-III) mineral in microbial culture and its characterization was not achieved. This study was carried out to investigate the sole formation of GR2(SO 2− 4 ) during the reduction of γ-FeOOH by a dissimilatory iron-respiring bacterium, Shewanella putrefaciens CIP 8040 T . Reduction experiments were performed in a non-buffered medium devoid of organic compounds, with 25 mM of sulphate and with a range of lepidocrocite concentrations with H 2 as the electron donor under nongrowth conditions. The resulting biogenic solids, after iron-respiring activity, were characterized by X-ray diffraction (XRD), transmission Mössbauer spectroscopy (TMS) and electron microscopy (SEM and TEM). The sulphate has been identified as the intercalated anion by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). In addition, the structure of this sulphate anion was discussed. Our experimental study demonstrated that, under H 2 atmosphere, the biogenic solid was a GR2(SO Address correspondence to Frédéric Jorand, LCPME, UMR 7564 CNRS, Université Henri Poincaré-Nancy 1, 405 rue de Vandoeuvre, F-54600 Villers-lès-Nancy, France. E-mail: jorand@pharma.uhpnancy.fr

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Trapping of Cr by Formation of Ferrihydrite during the Reduction of Chromate Ions by Fe(II)−Fe(III) Hydroxysalt Green Rusts

Cited by 200 publications

References 46 publications

Fougerite a Natural Layered Double Hydroxide in Gley Soil: Habitus, Structure, and Some Properties

Fougerite a Natural Layered Double Hydroxide in Gley Soil: Habitus, Structure, and Some Properties

Effect of Geochemical and Physical Heterogeneity on the Hanford 100D Area In Situ Redox Manipulation Barrier Longevity

Formation of Hydroxysulphate Green Rust 2 as a Single Iron(II-III) Mineral in Microbial Culture

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