Reduction of chromium (VI) with hydrogen sulfide in NaCl media

Pettine, M.; Millero, Frank J.; Passino, R.

doi:10.1016/0304-4203(94)90030-2

Cited by 102 publications

(93 citation statements)

References 33 publications

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“…As shown in Fig. 2, the reaction order with respect to the Cr(VI) in the presence of goethite is well expressed with the pseudo first order reaction similarly to that in homogeneous aqueous phase reported by Pettine et al (1994), and Kim et al (2001).…”

Section: Cr(vi) Reduction With Fixed Initial Concentrations Of Sulfidsupporting

confidence: 73%

“…The obtained slope of regression line was 1.514 indicating the reaction order to be 1.5 with respect to sulfide concentration. It has been shown that in homogeneous aqueous phase, the reaction order with respect to sulfide is 1 or less (Pettine et al, 1994;Kim et al, 2001;Lan et al, 2005). The different reaction order with respect to sulfide concentration in the presence of goethite suggests that Cr(VI) reduction by sulfide with goethite follows a pathway different from the one in the homogeneous system.…”

Section: Different Initial Sulfide and Goethite Concentrationsmentioning

confidence: 99%

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Kinetic study of hexavalent Cr(VI) reduction by hydrogen sulfide through goethite surface catalytic reaction

Kim¹,

Lan²,

Deng³

2007

Geochem. J.

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Hexavalent chromium reduction by sulfide in the presence of goethite was studied through several batch experiments. Under our specific experimental conditions including 20 µM of hexavalent chromium, 560-1117 µM of sulfide and 10.61-37.13 m 2 /L of goethite at pH of 8.45 controlled by 0.1 M borate buffer, the obtained hexavalent chromium disappearance1.5 and the determined overall rate constant (k) was 31.9 ± 4.2 (min). Among the potential major reducing agents in our comprehensive heterogeneous system such as aqueous phase sulfide, surface-associated sulfide, dissolved ferrous iron, ferrous iron on the goethite surface, as well as fresh ferrous sulfide in the solution, it was considered that the surface ferrous irons which could be produced following sulfide adsorption, played a leading role for Cr(VI) reduction as primary electron donors. In addition, no proof of the preliminary dissolution of ferrous iron from goethite to aqueous phase was observed in the experiments. Elemental sulfur was detected as the final stabilized product of sulfide and it took in charge for the promoted Cr(VI) disappearance for the successive addition of Cr(VI) at later stage.

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Section: Cr(vi) Reduction With Fixed Initial Concentrations Of Sulfidsupporting

confidence: 73%

Section: Different Initial Sulfide and Goethite Concentrationsmentioning

confidence: 99%

Kinetic study of hexavalent Cr(VI) reduction by hydrogen sulfide through goethite surface catalytic reaction

Kim¹,

Lan²,

Deng³

2007

Geochem. J.

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“…The produced dFe(II) can swiftly reduce Cr(VI) with reaction times on the order of minutes . In this process dFe(II) is oxidized to dFe(III), which is a highly insoluble species that will likely precipitate again as Fe (III) Additionally, acid volatile sulfides (AVS) have been recognized as potent reductants of Cr in sediments Pettine et al, 1994). AVS is an operational measurement that includes multiple dissolved sulfide reductants (e.g.…”

Section: Cr(vi) Reduction Mechanisms In the Anoxic Sediment Pore Watersmentioning

confidence: 99%

The marine biogeochemistry of chromium isotopes

Moos¹

2018

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“…Chromium is readily immobilized as (Fe,Cr)(OH) 3 under ferruginous conditions (19,20) and will be reduced and rendered insoluble by reaction with a wide range of other reductants under sulfidic or even denitrifying conditions (21)(22)(23). Thus, comparing Mo enrichments in independently constrained euxinic shales and Cr enrichments in independently constrained anoxic shales can offer a unique and complementary perspective on the global redox landscape of the ocean.…”

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confidence: 99%

Proterozoic ocean redox and biogeochemical stasis

Reinhard

Planavsky

Robbins

et al. 2013

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

440

407

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The partial pressure of oxygen in Earth's atmosphere has increased dramatically through time, and this increase is thought to have occurred in two rapid steps at both ends of the Proterozoic Eon (∼2.5-0.543 Ga). However, the trajectory and mechanisms of Earth's oxygenation are still poorly constrained, and little is known regarding attendant changes in ocean ventilation and seafloor redox. We have a particularly poor understanding of ocean chemistry during the mid-Proterozoic (∼1.8-0.8 Ga). Given the coupling between redoxsensitive trace element cycles and planktonic productivity, various models for mid-Proterozoic ocean chemistry imply different effects on the biogeochemical cycling of major and trace nutrients, with potential ecological constraints on emerging eukaryotic life. Here, we exploit the differing redox behavior of molybdenum and chromium to provide constraints on seafloor redox evolution by coupling a large database of sedimentary metal enrichments to a mass balance model that includes spatially variant metal burial rates. We find that the metal enrichment record implies a Proterozoic deep ocean characterized by pervasive anoxia relative to the Phanerozoic (at least ∼30-40% of modern seafloor area) but a relatively small extent of euxinic (anoxic and sulfidic) seafloor (less than ∼1-10% of modern seafloor area). Our model suggests that the oceanic Mo reservoir is extremely sensitive to perturbations in the extent of sulfidic seafloor and that the record of Mo and chromium enrichments through time is consistent with the possibility of a Mo-N colimited marine biosphere during many periods of Earth's history.paleoceanography | geobiology

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Reduction of chromium (VI) with hydrogen sulfide in NaCl media

Cited by 102 publications

References 33 publications

Kinetic study of hexavalent Cr(VI) reduction by hydrogen sulfide through goethite surface catalytic reaction

Kinetic study of hexavalent Cr(VI) reduction by hydrogen sulfide through goethite surface catalytic reaction

The marine biogeochemistry of chromium isotopes

Proterozoic ocean redox and biogeochemical stasis

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