Thermodynamic properties of the Sb(III) hydroxide complex Sb(OH)3(aq) at hydrothermal conditions

Зотов, А. В.; Shikina, N. D.; Akinfiev, Nikolay N.

doi:10.1016/s0016-7037(02)01281-4

Cited by 111 publications

(71 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fortunately, deficiencies associated with reliable thermochemical data for most of the common antimony oxides have been eliminated in the light of more recent experimental studies. Values reported by Zotov et al [28] for valentinite and sénarmontite are consistent with earlier data listed by Wagman et al [29] Values for the free energies of formation of valentinite and sénarmontite listed by Barin [37] are clearly erroneous, as noted byVink. [22] The situation with respect to cervantite, α-Sb 2 O 4 (Sb III Sb V O 4 ), has been somewhat more [33] except for Sb(OH) − 6 (aq).…”

Section: Solubility Issuessupporting

confidence: 87%

“…[23,[25][26][27][28][29][30][31][32][33][34][35][36] Reliable thermochemical data are available for stibnite, [25,26] but the accuracy and precision of data derived from Williams-Jones and Normand [23] and Babčan [27] for kermesite remain questionable. Fortunately, deficiencies associated with reliable thermochemical data for most of the common antimony oxides have been eliminated in the light of more recent experimental studies.…”

Section: Solubility Issuesmentioning

confidence: 99%

“…Consider the case of Sb 2 O 3 (s), where concentrations of 500 mg L −1 are claimed to have been used. Cubic Sb 2 O 3 (s) is the thermodynamically stable phase and it can be easily deduced from Zotov et al data [28] that at 25 • C, and at pH values from 4 to 10, the solubility of sénarmontite in water limits dissolved Sb concentrations to ∼1.3 mg L −1 . Yet there is a longstanding awareness of the solubility problem.…”

Section: What Is More Toxic?mentioning

confidence: 99%

See 2 more Smart Citations

Antimony in the environment: knowns and unknowns

2009

View full text Add to dashboard Cite

Environmental context. Antimony first attracted public attention in the mid-1990s amid claims that it was involved in Sudden Infant Death Syndrome. A substantial number of papers have now been published on the element and its behaviour in the natural environment. However, many key aspects of the environmental chemistry of antimony remain poorly understood. These include critical areas such as its ecotoxicology, its global cycling through different environmental compartments, and what chemical form it takes in different environments. More focussed research would help the situation. The present review highlights several areas of environmental antimony chemistry that urgently need to be addressed.Abstract. The objective of the present article is to present a critical overview of issues related to the current state of knowledge on the behaviour of antimony in the environment. It makes no attempt to systematically review all published data. However, it does provide a list of the main published reviews on antimony and identifies subjects where systematic reviews are needed. Areas where our knowledge is strong -and the corresponding gaps -in subjects ranging from total concentrations and speciation in the various environmental compartments, to ecotoxicity, to cycling between compartments, are discussed, along with the underlying research. Determining total antimony no longer poses a problem for most environmental samples but speciation measurements remain challenging throughout the process, from sampling to analysis. This means that the analytical tools still need to be improved but experience shows that, to be useful in practice, this should be directly driven by the requirements of laboratory and field measurements. Many different issues can be identified where further research is required, both in the laboratory and in the field, the most urgently needed studies probably being: (i) long-term spatial and temporal studies in the different environmental compartments in order to collect the data needed to establish a global biogeochemical cycle; (ii) laboratory studies of antimony interactions with potential natural binders; (iii) reliable ecotoxicological studies. Montserrat Filella is a chemist and teaches Environmental Chemistry at the University of Geneva, Switzerland. Her main research interests focus on the understanding of the physicochemical processes regulating the behaviour of chemical components in environmental and biological compartments, mainly by combining computer modelling with field and laboratory measurements. The three main axes of her research concern the study of: colloids in natural waters, natural organic matter (quantification and interaction with trace elements) and Group 15 elements. She is also interested in other topics

show abstract

Section: Solubility Issuessupporting

confidence: 87%

Section: Solubility Issuesmentioning

confidence: 99%

Section: What Is More Toxic?mentioning

confidence: 99%

See 1 more Smart Citation

Antimony in the environment: knowns and unknowns

2009

View full text Add to dashboard Cite

show abstract

“…The observed experimental sequence of Sb reduction followed by As reduction, suggests Sb reduction to Sb 2 O 3(s) , rather than to Sb(OH) 3 . Calculations are based on the thermodynamic values given in Bard et al (1985); Filella and May (2003); Nordstrom et al (2014); Tratnyek and Macalady (2000); Zotov et al (2003 detoxification is independent of the DOC concentration and not inhibited by O 2 (Table 2, R 10 ). Modelling results indicate that the persistence of As(III) in solution is consistent with its low sorption affinity to clay minerals (Table 3; Lin and Puls, 2000) and the under-saturation of the solution with respect to CaHAsO 3 (SI = −0.38).…”

Section: Fate Of As In the Presence Of Microorganismsmentioning

confidence: 99%

Speciation dynamics of oxyanion contaminants (As, Sb, Cr) in argillaceous suspensions during oxic-anoxic cycles

Markelova

Couture

Parsons

et al. 2018

Applied Geochemistry

View full text Add to dashboard Cite

A B S T R A C TArgillaceous geological formations are considered promising repositories for waste containing inorganic contaminants. However, the sequestration capacity of an argillaceous natural barrier may change as a result of dynamic environmental conditions, in particular changes in redox state. Here, we imposed redox cycles to argillaceous suspensions amended with a mixture of the inorganic contaminants As(V), Sb(V), Cr(VI), by alternating 7-day cycles of sparging with either oxic or anoxic gas mixtures. During the redox cycles, we assessed the relative importance of different contaminant sequestration mechanisms under sterile and non-sterile conditions. The non-sterile experiments were carried out 1) with the argillaceous material as is, that is, containing the native microbial population, 2) with the addition of ethanol as a source of labile organic carbon, and 3) with the addition of both ethanol and a soil microbial inoculum. In order to capture the observed solid-solution partitioning trends, a series of mixed thermodynamic-kinetic models representing the dynamic conditions in the experiments were developed using PHREEQC. Parameter values for processes such as adsorption, which occurred in all experiments, were kept constant across all the simulations. Additional formulations were introduced as needed to account for the microbial detoxification and respiration of the contaminants in the increasing complexity experiments. Abiotic adsorption of As and abiotic reductive precipitation of Cr dominated sequestration of these two contaminants under all experimental conditions, whereas the presence of microorganisms was essential to decrease the aqueous Sb concentration. Once reduced, As(III), Sb(III), and Cr(III) were not reoxidized upon exposure to dissolved O 2 in any of the experiments. Neither the mineralogy nor the native microbiota catalysed contaminant oxidation processes. Thus, kinetically, the reduction of As(V), Sb(V), and Cr(VI) was irreversible over the experimental duration (49 days). The capacity of the argillaceous matrix to reduce and sequester the aqueous contaminants, without subsequent remobilization to the aqueous phase during the oxic periods, supports the use of argillaceous barriers for geologic waste storage.

show abstract

“…They distinguished a group of elements (As, Mo, Cu, Sb, Bi, and B) displaying a distinct negative correlation with the chlorinity of the fluid, which suggests transport as non-chloride (i.e., hydroxy) complexes. Of these elements, Mo, As, Sb, and B are known to occur as hydroxy complexes in hydrothermal fluids [71][72][73][74]. Fluorine is not an important ligand involved in the hydrothermal transport of Mo in granite-related systems [58,61,75].…”

Section: Molybdenum In Intrusion-related Hydrothermal Systemsmentioning

confidence: 99%

The Solubility of Tugarinovite (MoO₂) in H₂O at Elevated Temperatures and Pressures

et al. 2017

View full text Add to dashboard Cite

The solubility of tugarinovite (MoO 2 ) in pure water was investigated at temperatures between 400 and 800 ∘ C and at pressures ranging between 95 and 480 MPa by using in situ synchrotron X-ray fluorescence (SXRF) to separately analyze high temperature aqueous solutions in a hydrothermal diamond anvil cell (HDAC). The concentration of molybdenum in the fluid at 400 and 500 ∘ C was below detection; however, at temperatures between 600 and 800 ∘ C, the solubility of tugarinovite increased with increasing temperature by two orders of magnitude. The molybdenum concentration at 600 ∘ C and 800 ∘ C is 44 ppm and 658 ppm, respectively. The results complement the data of Kudrin (1985) and provide the first measurement of MoO 2 solubility at pressure and temperature conditions comparable to intrusion-related Mo deposit formation. The data are also relevant to the study of water chemistry and corrosion product transport in supercritical-water-cooled reactors, where Mo-bearing steel alloys interact with aqueous solutions at temperatures greater than 600 ∘ C. The application of in situ SXRF to solubility measurements of sparingly soluble minerals is recommended because it circumvents analytical uncertainties inherent in determinations obtained by quenching and weight loss measurements.

show abstract

Thermodynamic properties of the Sb(III) hydroxide complex Sb(OH)3(aq) at hydrothermal conditions

Cited by 111 publications

References 41 publications

Antimony in the environment: knowns and unknowns

Antimony in the environment: knowns and unknowns

Speciation dynamics of oxyanion contaminants (As, Sb, Cr) in argillaceous suspensions during oxic-anoxic cycles

The Solubility of Tugarinovite (MoO₂) in H₂O at Elevated Temperatures and Pressures

Contact Info

Product

Resources

About

Thermodynamic properties of the Sb(III) hydroxide complex Sb(OH)3(aq) at hydrothermal conditions

Cited by 111 publications

References 41 publications

Antimony in the environment: knowns and unknowns

Antimony in the environment: knowns and unknowns

Speciation dynamics of oxyanion contaminants (As, Sb, Cr) in argillaceous suspensions during oxic-anoxic cycles

The Solubility of Tugarinovite (MoO2) in H2O at Elevated Temperatures and Pressures

Contact Info

Product

Resources

About

The Solubility of Tugarinovite (MoO₂) in H₂O at Elevated Temperatures and Pressures