A calorimetric and thermodynamic investigation of zinc and cadmium hydrous selenites

Lelet, Maxim I.; Charykova, M. V.; Кривовичев, В. Г.; Efimenko, Nataliya M.; Platonova, N. V.; Сулейманов, Е. В.

doi:10.1016/j.jct.2017.07.020

Cited by 9 publications

(8 citation statements)

References 19 publications

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“…Additional thermodynamic data (∆ f G 0 298 for solid phases not containing selenium and aqueous species) for the calculation of diagrams have been taken from [47]. In addition, some of our recent articles were used as sources of ∆ f G 0 298 for certain selenites [17,18,48,49]. It should be emphasized that the values of the Gibbs energy of formation are known only for 25 (Table 1) of the 118 selenium minerals.…”

Section: Thermodynamicsmentioning

confidence: 99%

“…The monohydrate appears to be a metastable phase. The thermochemical calorimetric investigations were carried out on synthetic zinc selenites, ZnSeO3·2H2O and ZnSeO3·H2O [18].…”

Section: Thermodynamic System Zn-se-h2omentioning

confidence: 99%

“…Cadmoselite was found in Ust' Uyok deposit (Turan District, Tuva Republic, Eastern-Siberian Region, Russia) as fine xenomorphic disseminations cementing sandstone associated with ferroselite, clausthalite, amorphous selenium, Cd-bearing sphalerite, and pyrite [58]. The thermodynamic constants of synthetic hydrous cadmium selenite were reported [18]. These data were used for plotting the Eh-pH diagram of the Cd-Se-H2O system (Figure 8).…”

Section: Thermodynamic System Cd-se-h2omentioning

confidence: 99%

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The Thermodynamics of Selenium Minerals in Near-Surface Environments

2017

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Selenium compounds are relatively rare as minerals; there are presently only 118 known mineral species. This work is intended to codify and systematize the data of mineral systems and the thermodynamics of selenium minerals, which are unstable (selenides) or formed in near-surface environments (selenites), where the behavior of selenium is controlled by variations of the redox potential and the acidity of solutions at low temperatures and pressures. These parameters determine the migration of selenium and its precipitation as various solid phases. All selenium minerals are divided into four groups-native selenium, oxide, selenides, and oxysalts-anhydrous selenites (I) and hydrous selenites and selenates (II). Within each of the groups, minerals are codified according to the minimum number of independent elements necessary to define the composition of the mineral system. Eh-pH diagrams were calculated and plotted using the Geochemist's Workbench (GMB 9.0) software package. The Eh-pH diagrams of the Me-Se-H 2 O systems (where Me = Co, Ni, Fe, Cu, Pb, Zn, Cd, Hg, Ag, Bi, As, Sb, Al and Ca) were plotted for the average contents of these elements in acidic waters in the oxidation zones of sulfide deposits. The possibility of the formation of Zn, Cd, Ag and Hg selenites under natural oxidation conditions in near surface environments is discussed.

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Section: Thermodynamicsmentioning

confidence: 99%

“…The monohydrate appears to be a metastable phase. The thermochemical calorimetric investigations were carried out on synthetic zinc selenites, ZnSeO3·2H2O and ZnSeO3·H2O [18].…”

Section: Thermodynamic System Zn-se-h2omentioning

confidence: 99%

Section: Thermodynamic System Cd-se-h2omentioning

confidence: 99%

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The Thermodynamics of Selenium Minerals in Near-Surface Environments

2017

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“…Reliable solubility product or Gibbs energy of formation values of the phases crystallized in the system are necessary for calculation of mineral equilibria. In this study, we continue our systematic investigation of the thermodynamic properties of hydrous selenites [3][4][5] by performing a calorimetric and thermodynamic study of hydrous ferric selenite, a synthetic analogue of mandarinoite, (Fe 2 (SeO 3 ) 3 •5H 2 O).…”

Section: Introductionmentioning

confidence: 99%

“…The analysis of the thermodynamic parameters (solubility product or Gibbs energy of formation) for calculation of mineral equilibria involving selenites [1][2][3]5,[9][10][11] showed that these parameters frequently raise questions and need specification.…”

Section: Introductionmentioning

confidence: 99%

A Calorimetric and Thermodynamic Investigation of the Synthetic Analogue of Mandarinoite, Fe2(SeO3)3·5H2O

et al. 2018

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Thermophysical and thermochemical calorimetric investigations were carried out on the synthetic analogue of mandarinoite. The low-temperature heat capacity of Fe2(SeO3)3∙5H2O(cr) was measured using adiabatic calorimetry between 5.3 and 324.8 K, and the third-law entropy was determined. Using these Cp,mo(T) data, the third law entropy at T = 298.15 K, Smo, is calculated as 520.1 ± 1.1 J∙K–1∙mol–1. Smoothed Cp,moT values between T → 0 K and 320 K are presented, along with values for Smo and the functions [HmoT-Hmo0] and [ΦmoT-Φmo0]. The enthalpy of formation of Fe2(SeO3)3∙5H2O(cr) was determined by solution calorimetry with HF solution as the solvent, giving ΔfHmo(298 К, Fe2(SeO3)3∙5H2O, cr) = –3124.6 ± 5.3 kJ/mol. The standard Gibbs energy of formation for Fe2(SeO3)3∙5H2O(cr) at T = 298 K can be calculated on the basis on ΔfHmo(298 К) and ΔfSmo(298 К): ΔfGmo(298 К, Fe2(SeO3)3∙5H2O, cr) = ‒2600.8 ± 5.4 kJ/mol. The value of ΔfGm for Fe2(SeO3)3·5H2O(cr) was used to calculate the Eh–pH diagram of the Fe–Se–H2O system. This diagram has been constructed for the average contents of these elements in acidic waters of the oxidation zones of sulfide deposits. The behaviors of selenium and iron in the surface environment have been quantitatively explained by variations of the redox potential and the acidity-basicity of the mineral-forming medium. These parameters precisely determine the migration ability of selenium compounds and its precipitation in the form of solid phases.

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Crystal structure, IR investigation and interpretation of interactions in cobalt selenate pentahydrate

Mihov

Yankova

2021

Chemical Data Collections

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A calorimetric and thermodynamic investigation of zinc and cadmium hydrous selenites

Cited by 9 publications

References 19 publications

The Thermodynamics of Selenium Minerals in Near-Surface Environments

The Thermodynamics of Selenium Minerals in Near-Surface Environments

A Calorimetric and Thermodynamic Investigation of the Synthetic Analogue of Mandarinoite, Fe2(SeO3)3·5H2O

Crystal structure, IR investigation and interpretation of interactions in cobalt selenate pentahydrate

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