Comparison of tungstate and tetrathiotungstate adsorption onto pyrite

Cui, Minming; Johannesson, Karen H.

doi:10.1016/j.chemgeo.2016.11.034

Cited by 54 publications

(25 citation statements)

References 64 publications

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“…In recent decades, concerns regarding elevated concentrations of tungsten (W) in the terrestrial environment have been raised (Cui and Johannesson 2017;Datta et al 2017;Koutsospyros et al 2006;Lemus and Venezia 2015;Strigul 2010;Zoroddu et al 2018, and references therein). High concentrations combined with poor knowledge of its geochemical behavior and toxicity has led to the US Environmental Protection Agency (2014) classifying W as an emerging contaminant of concern, and in Russia it was classified as a highly dangerous contaminant in aquatic systems in 2009 (Strigul et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Scheelite weathering and tungsten (W) mobility in historical oxidic-sulfidic skarn tailings at Yxsjöberg, Sweden

Hällström

Alakangas

Martinsson

2019

Environ Sci Pollut Res

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More knowledge of the geochemical behavior of tungsten (W) and associated contamination risks is needed. Therefore, weathering of scheelite (CaWO 4) and secondary sequestration and transport of W to groundwater in historical skarn tailings and surface water downstream of the tailings were studied. The tailings contained 920 mg/kg W, primarily in scheelite. Mineralogical and geochemical analyses were combined to elucidate the geochemical behavior of W in the tailings, and water samples were taken monthly during 2018 to monitor its mobility. In the tailings, a large peak of W was found at 1.5 m depth. There, 30 wt%. of W was present in easily reducible phases, indicating former scheelite weathering. Currently, W is being released from scheelite to water-soluble phases at 2.5 m depth. The release of WO 4 2− is hypothetically attributed to anion exchange with CO 3 2− released from calcite neutralizing acid produced from pyrrhotite oxidation in the upper tailings and transported downwards to pH conditions > 7. Higher concentrations of dissolved W were found in the groundwater and particulate W in downstream surface water than in reference water, but they were lower than current contamination thresholds. Tungsten showed correlations with hydrous ferric oxides (HFO) in both the tailings and surface water.

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Section: Introductionmentioning

confidence: 99%

Scheelite weathering and tungsten (W) mobility in historical oxidic-sulfidic skarn tailings at Yxsjöberg, Sweden

Hällström

Alakangas

Martinsson

2019

Environ Sci Pollut Res

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“…Adsorption of tungsten and tetrathiotungstate (WS 2− 4 ) onto pyrite was investigated, showing an increased adsorption capacity with decreasing pH and a higher adsorption of WO 2− 4 over WS 2− 4 (Cui & Johannesson, 2016). The authors correlate the adsorption capacity of W forms with different inner-sphere complexation on the pyrite surface.…”

Section: Tungstenmentioning

confidence: 99%

Biogeochemistry of trace elements in anaerobic digesters

2019

Trace Elements in Anaerobic Biotechnologies

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Essential trace elements (TE) are a prerequisite that ensures optimal performance of the anaerobic digestion (AD) process. However, finding the proper way to deliver these micronutrients to microbial communities is not an easy task. The chemical speciation of TE and the complex environment characterizing AD play a critical role in their mobility, bioavailability, and toxicity. These aspects are particularly

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“…It is suggested that polyoxytungstates and heteropolytungstates adsorb to a lesser degree than tungstate onto ferrihydrite and presumably other minerals. Cui and Johannesson [22] concluded that tungstate adsorption onto pyrite increased with decreasing pH. Rakshit et al [23] adopted an in situ ATR-FTIR probe to determine the sorption mechanism of W on hematite at fixed pH values ranged from 4.6 to 8.1.…”

Section: The Role Of Iron Oxidesmentioning

confidence: 99%

Tungsten speciation and its geochemical behavior in geothermal water: A review

Cao

Guo

2019

E3S Web Conf.

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Tungsten and most of its compounds remain one of the least regulated substances. As the potential toxicity of tungsten has been reported, the stereotypes about tungsten are gradually being broken. Areas with intense magmatic hydrothermal activity are likely threatened by geothermal tungsten (up to 1037 μg/L of tungsten was detected in the geothermal waters from a magmatic hydrothermal system in Tibet, Daggyai), and the geothermal developers should be cautious during the utilization of geothermal resource. This paper reviews the studies on transformation of aqueous tungsten species, distribution of tungsten in geothermal waters, and critical geochemical processes (or parameters) controlling geothermal tungsten concentrations. The mobility of aqueous tungsten depends on environmental pH, its complexation with sulfide, and its sorption onto Fe(III) oxides/oxyhydroxides. More attention still needs to be paid to environmental geochemistry of tungsten, in view that there are limited literatures reporting the thermodynamic properties of tungsten compounds at high temperatures and the models delineating the geochemical behavior of tungsten.

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Comparison of tungstate and tetrathiotungstate adsorption onto pyrite

Cited by 54 publications

References 64 publications

Scheelite weathering and tungsten (W) mobility in historical oxidic-sulfidic skarn tailings at Yxsjöberg, Sweden

Scheelite weathering and tungsten (W) mobility in historical oxidic-sulfidic skarn tailings at Yxsjöberg, Sweden

Biogeochemistry of trace elements in anaerobic digesters

Tungsten speciation and its geochemical behavior in geothermal water: A review

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