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Showing 1 to 13 of 13 for “"Sulfide precipitation"”.
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Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin
… mixing with hydrothermal fluids, coupled with sulfide precipitation and metal remobilization. REE distributions in vent fluids in the Manus Basin exhibit a wide range of chondrite-normalized patterns that contrast with the relatively uniform distributions observed in mid-ocean ridge vent …
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Critical Elements Recovery from Acid Mine Drainage
… was redissolved for further purification. Sodium sulfide was added into the redissolved solution to precipitate Co, Ni, and Zn selectively while retaining Mn in the solution. Almost 100% of Co, Ni, and Zn but only around 15% of Mn were precipitated using a sulfur-to-metal molar ratio of 1 at pH …
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Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin
… mixing with hydrothermal fluids, coupled with sulfide precipitation and metal remobilization. REE distributions in vent fluids in the Manus Basin exhibit a wide range of chondrite-normalized patterns that contrast with the relatively uniform distributions observed in mid-ocean ridge vent …
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Fluid Inclusion Evidence for Ore-Forming Solutions: Phoenixville, Audubon and New Galena Mine Districts, PA
… interaction with the ore solution, which favored sulfide precipitation.</p>
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The biodegradation of valeric, butyric, propionic and acetic acids in anoxic, subsurface, soil environments
… pH, the utilization of sulfate with concomitant precipitation of iron sulfide , an increase in the degradation rate as a result of sulfate addition, and a production of bicarbonate directly related to acid mineralization. Another soil, from Blacksburg, Virginia, consisted of a silty-clay …
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Zinc distribution in a small stream receiving treated textile wastewater
… functioning to dilute stream pollutant load. Sulfide precipitation appeared to be an important mechanism by which zinc was concentrated in the sediments 40 m below the domestic sewage discharge. Zinc concentrations declined further downstream likely as a result of such factors as dilution, …
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El Espino Iron-Oxide Copper Gold District, Coastal Cordillera of North-Central Chile, The
… part of the alteration system. Iron oxides and sulfides are largely confined to calcic and hydrolytic alteration assemblages. The fluids responsible for sulfide precipitation ranged in temperature from 350 to 425 degrees C with salinities between 32 and 34 wt. NaCl equivalent. Mineralization …
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SEASONAL BIOCHEMISTRY IN THE SEDIMENTS OF THE GREAT BAY ESTUARINE COMPLEX, NEW HAMPSHIRE
… sedimentary concentrations of acid-volatile sulfides, and the abundance of sulfate-reducing bacteria were also made.</p><p>Average annual sulfate reduction at JEL was 5 times more rapid than at SQAUM (140 vs 30 nmoles(.)ml('-1)(.)d('-1)) and influenced by bioturbation-mediated transport of …
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The chemistry of iron in hydrothermal plumes
… the isotope fractionation<br/>caused by Fe sulfide precipitation to be determined. A diagnostic isotope signature for a<br/>potential stabilised dissolved Fe fraction was predicted to be isotopically heavier than the<br/>original vent fluid, potentially enabling Fe inputs from hydrothermal …
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The geology of the Khayyam and Stumble-On deposits, Prince of Wales Island, Alaska
… are stratiform copper-zinc-gold-silver massive sulfide deposits within the late Proterozoic(?) to pre-Middle Ordovician Wales Group, a metamorphosed volcanic arc complex within the Alexander tectonostratigraphic terrain. These massive sulfide deposits are interbedded with schist layers of …
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Composition and fabric of the Kupferschiefer, Sangerhausen Basin, Germany and a comparison to the Kupferschiefer in the Lubin Mining District, Poland
… Kupferschiefer, with a few distinct differences. Sulfide mineralization, in the form of disseminated spherules, blebs, aggregates, framboids, and bedding-parallel and -perpendicular veins, is observed in both locations on macro- and microscopic scales. The most abundant sulfide in mineralized …
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The Role of Sulfhydryl-Containing Low Molecular Weight Ligands for the Environmental Fate of Zinc Sulfide and Metallic Silver Nanoparticles
… and reactivity of nanoparticulate zinc sulfide and metallic silver. Zinc sulfide was used as a representative of nanoparticulate metal sulfide which occurs naturally in sulfidic environments. Metallic silver nanoparticles were also studied because of its wide use in consumer products. …
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Sediment-Pore Water Chemistry of Taupo Volcanic Zone Lakes and the Effect Trophic State has on Exchange with the Water Column
… wide range of redox, diagenetic, dissolution and precipitation processes occurred, and these were specific to the compound examined, the lake and season. The dominant process associated with the onset of anoxia involved reduction, with nitrate to ammonium, manganic to manganous, ferric reduced to …