Zinc complexation in aqueous sulfide solutions: Determination of the stoichiometry and stability of complexes via ZnS(cr) solubility measurements at 100°C and 150bars

Тагиров, Б. Р.; Suleimenov, O.M.; Seward, Terry M.

doi:10.1016/j.gca.2007.08.012

Cited by 44 publications

(17 citation statements)

References 28 publications

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“…The solubility of ZnS at 100°C and 150°C was measured by [5]. The measurements were carried out in a titanium flow-through hydrothermal reactor.…”

Section: Introductionmentioning

confidence: 99%

“…The analytical techniques and the experimental procedures documented in literature for measuring the solubility of ZnS are widely diverse, which is a contributing factor for the observed scatter in the published data. The zinc content was analyzed using atomic absorption spectroscopy [3,[5][6][7][8] The solubility of mineral and precipitated ZnS was measured by [9]. The author did not use degassed water, which could lead to the formation of oxidized sulfate species.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Zinc Sulfide Solubility to High Temperatures

et al. 2017

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A new experimental set-up and methodology for the measurement of ZnS solubility in aqueous solutions at 40, 60 and 80 ˚C (atmospheric pressure) is presented. The methodology implemented includes the preparation of the samples in a reduced oxygen atmosphere, particle size analysis of ZnS, quality control of the analytical technique and evaluation of equilibration time.ZnS solubility analyses were run at prolonged times (up to 11 days) to ensure that equilibrium conditions were met. The equilibration time was explored at three temperatures (40 ˚C, 60 ˚C, and 80 ˚C) observing small variations in the time required to reach the solid liquid equilibrium conditions at each temperature. Equilibrium was reached within 72 hours. The concentration of zinc and of total sulfur was determined using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The experimental solubility data show an exponential dependency of the solubility with respect to temperature. An increase of 40 ˚C results in an increase of roughly 12 times for the solubility of ZnS.

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“…The solubility of ZnS at 100°C and 150°C was measured by [5]. The measurements were carried out in a titanium flow-through hydrothermal reactor.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of Zinc Sulfide Solubility to High Temperatures

et al. 2017

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“…A recent thermodynamic study (Zhong et al, 2015a) suggests that Zn(II)-bisulfide complexes may play an important role for zinc transport at high temperature (i.e., >500°C). However, our understanding of the role of sulfur for zinc transport in hydrothermal fluids is still limited, since the current knowledge regarding the speciation of Zn(II) in bisulfide solutions is based upon ex situ measurements of sphalerite (ZnS) solubility performed over a limited range of experimental conditions (ambient to 350°C, P sat ; Bourcier and Barnes, 1987;Hayashi et al, 1990;Daskalakis and Helz, 1993;Tagirov et al, 2007;Tagirov and Seward, 2010). By their nature, solubility studies provide quantitative information about the Zn:S ratio in the dominant Zn(II) complexes, but no direct information on the structure of these complexes.…”

Section: Introductionmentioning

confidence: 99%

Speciation and thermodynamic properties of zinc in sulfur-rich hydrothermal fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

Mei

Etschmann

Liu

et al. 2016

Geochimica et Cosmochimica Acta

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“…The cooling of the hydrothermal fluids that transport Zn either as Zn-Cl or Zn-H-S complexes was combined with a pH change towards more alkaline values due to interaction with the encasing carbonate rocks. Under the conditions experienced by the investigated limestone [maximal burial depth of 1,000 m and burial temperature of 70°C (Elie and Mazurek 2008;Mazurek et al 2006;Timar-Geng et al 2006)], these changes probably resulted in sphalerite precipitation (Daskalakis and Helz 1993;Tagirov et al 2007). Recent direct Rb-Sr dating of sphalerite crystals from the Auenstein section (JMR, Late Bajocian/Early Bathonian) yielded an age of 162 ± 4 Ma, corresponding to Late Callovian/Early Oxfordian, which confirms that formation of sphalerite probably occurred after sediment deposition (Efimenko et al 2009).…”

Section: Discussionmentioning

confidence: 99%

Origin of high Zn contents in Jurassic limestone of the Jura mountain range and the Burgundy: evidence from Zn speciation and distribution

et al. 2011

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In order to better understand the origin and enrichment mechanisms leading to elevated Zn concentrations in Jurassic limestone of the Jura mountain range (JMR) and the Burgundy (B), we investigated four locations of Bajocian age (JMR: Lausen-Schleifenberg, Gurnigel; B: Vergisson-Davayé, Lucy-le-Bois) and two locations of Oxfordian age (JMR: Dornach, Pichoux) for their Zn distribution and speciation. Measurements of the acid-extractable and bulk Zn contents showed that Zn is stratigraphically and spatially heterogeneously distributed, in association with permeable carbonate levels. Up to 3,580 and 207 mg/kg Zn was detected in Bajocian and Oxfordian limestone, respectively, with numerous limestone samples having Zn contents above 50 mg/kg. Using X-ray absorption near edge structure spectroscopy and micro-X-ray fluorescence spectrometry, the speciation and microscale distribution of Zn was investigated for selected limestone samples. In Bajocian limestone sphalerite and/or Zn-substituted goethite and a minor fraction of Zn-bearing carbonates were identified. In contrast, Zn-bearing carbonates (Zn-substituted calcite and hydrozincite) were accounting for most of the total Zn in Oxfordian limestone. The micro-scale distribution of Zn for Bajocian and Oxfordian limestone was however similar with localized Zn-rich zones in the limestone cement and at the rim of oolites. The stratigraphic sporadicity and microscale heterogeneity of the Zn distribution together with the Zn speciation results point to a hydrothermal origin of Zn. Occurence of Zn-goethite is probably linked to the oxidative transformation of framboidal pyrite and hydrothermal sphalerite in contact with meteoritic waters. Difference in speciation between Bajocian limestone and Oxfordian limestone may be related to differences in rock permeability Geosci (2011) 104:409-424 DOI 10.1007 and/or to various hydrothermal events. Isotopic dating of the different mineralizations will be needed to decipher differences in Zn speciation and the precise chronology of hydrothermal episodes.

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Zinc complexation in aqueous sulfide solutions: Determination of the stoichiometry and stability of complexes via ZnS(cr) solubility measurements at 100°C and 150bars

Cited by 44 publications

References 28 publications

Determination of Zinc Sulfide Solubility to High Temperatures

Determination of Zinc Sulfide Solubility to High Temperatures

Speciation and thermodynamic properties of zinc in sulfur-rich hydrothermal fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

Origin of high Zn contents in Jurassic limestone of the Jura mountain range and the Burgundy: evidence from Zn speciation and distribution

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