The Dissociation Constant of Antimonic Acid at 10–40 °C

Accornero, Marina; Marini, Luigi; Lelli, Matteo

doi:10.1007/s10953-008-9280-4

Cited by 28 publications

(11 citation statements)

References 26 publications

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“…A reliable lg K value for equation 2 at 298.2 K of À2.848 at I = 0 was reported recently by Accornero et al (2008). Correction to I = 0.1053 mol dm À3 (Mg 2+ and Zn 2+ runs) and 0.0996 mol dm À3 (Pb 2+ ) by the method of Baes and Mesmer (1976), yields lg K(298.2 K) = À2.611 and À2.613, respectively.…”

Section: Solution Studiessupporting

confidence: 55%

Stabilities of byströmite, MgSb₂O₆, ordoñezite, ZnSb₂O₆ and rosiaite, PbSb₂O₆, and their possible roles in limiting antimony mobility in the supergene zone

et al. 2015

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In order to clarify the roles that secondary minerals may have in determining the extent of dispersion of Sb in the supergene environment, syntheses and stability studies of the Sb(V) oxides byströ mite, MgSb 2 O 6 , ordoñ ezite, ZnSb 2 O 6 and rosiaite, PbSb 2 O 6 , have been undertaken. Solubilities in aqueous HNO 3 were determined at 298.2 K and the data obtained used to calculate values of DG f at the same temperature. The derived DG f (s, 298.2 K) values for MgSb 2 O 6 (À1554.1 Ô3.6 kJ mol À1 ), ZnSb 2 O 6 (À1257.0 Ô2.6 kJ mol À1 ) and PbSb 2 O 6 (À1154.2 Ô2.6 kJ mol À1 ) have been used in subsequent calculations to determine their relative stabilities and relationships with other secondary Sb minerals.

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Section: Solution Studiessupporting

confidence: 55%

Stabilities of byströmite, MgSb₂O₆, ordoñezite, ZnSb₂O₆ and rosiaite, PbSb₂O₆, and their possible roles in limiting antimony mobility in the supergene zone

et al. 2015

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“…This was indeed alluded to by Baes and Mesmer [15], and carefully considered in a recent determination of the temperature-dependence of the pK a of Sb(OH) 5 o (aq) [22]. While aqueous solutions of KSb(OH) 6 with concentrations of the order of 0.1 mol dm -3 appear to be stable for protracted periods at 25 °C, their proton-exchanged equivalents are not and white precipitates of "antimonic acid", Sb 2 O 5 ؒnH 2 O are obtained over hours to days, depending upon the temperature.…”

Section: Solution Geochemistrymentioning

confidence: 87%

Dispersion of antimony from oxidizing ore deposits

Diemar

Filella

Leverett

et al. 2009

Pure and Applied Chemistry

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, at 25 °C in 0.100 mol dm -3 aqueous HNO 3 was also investigated. Equilibrium dissolved Sb concentrations were 3.3 ± 1.0 × 10 -7 and 7.7 ± 2.1 × 10 -8 mol dm -3 , respectively. These values have been used to re-evaluate the geochemical mobility of Sb in the supergene environment. It is concluded that the element is geochemically immobile in solution and in soils. This was in part validated by an orientation soil geochemical survey over the Bayley Park prospect near Armidale, New South Wales, Australia. Anomalous soil Sb levels are confined to within 100 m of known stibnite mineralization.

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“…[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%

“…[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). A value for the latter, −1218.2 kJ mol −1 with an estimated error of ±1.0 kJ mol −1 , was calculated from the electrochemical and solubility data of Past, [34] Baes and Mesmer [35] and Accornero et al [36] problematic. The generally accepted value for G • f (298.15 K) is taken from Wagman et al [29] but a range of values is found in the literature.…”

Section: Solubility Issuesmentioning

confidence: 99%

Antimony in the environment: knowns and unknowns

2009

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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

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The Dissociation Constant of Antimonic Acid at 10–40 °C

Cited by 28 publications

References 26 publications

Stabilities of byströmite, MgSb₂O₆, ordoñezite, ZnSb₂O₆ and rosiaite, PbSb₂O₆, and their possible roles in limiting antimony mobility in the supergene zone

Stabilities of byströmite, MgSb₂O₆, ordoñezite, ZnSb₂O₆ and rosiaite, PbSb₂O₆, and their possible roles in limiting antimony mobility in the supergene zone

Dispersion of antimony from oxidizing ore deposits

Antimony in the environment: knowns and unknowns

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The Dissociation Constant of Antimonic Acid at 10–40 °C

Cited by 28 publications

References 26 publications

Stabilities of byströmite, MgSb2O6, ordoñezite, ZnSb2O6 and rosiaite, PbSb2O6, and their possible roles in limiting antimony mobility in the supergene zone

Stabilities of byströmite, MgSb2O6, ordoñezite, ZnSb2O6 and rosiaite, PbSb2O6, and their possible roles in limiting antimony mobility in the supergene zone

Dispersion of antimony from oxidizing ore deposits

Antimony in the environment: knowns and unknowns

Contact Info

Product

Resources

About

Stabilities of byströmite, MgSb₂O₆, ordoñezite, ZnSb₂O₆ and rosiaite, PbSb₂O₆, and their possible roles in limiting antimony mobility in the supergene zone

Stabilities of byströmite, MgSb₂O₆, ordoñezite, ZnSb₂O₆ and rosiaite, PbSb₂O₆, and their possible roles in limiting antimony mobility in the supergene zone