Antimony speciation in saline hydrothermal fluids: A combined X-ray absorption fine structure spectroscopy and solubility study

Geochemical characteristics of naturally acid and alkaline saline lakes in southern Western Australia

“…The WA lakes and groundwaters contain up to 3 mg/L Sb, which is 500 times the US EPA toxic limit. Sb is thought to react with Cl in acid saline solutions, although due to the uncommon nature of this type of fluid, is not well understood and has been described as having ''little relevance for natural environments" (Pokrovski et al, 2006).…”

Silver in geological fluids from in situ X-ray absorption spectroscopy and first-principles molecular dynamics

“…artifacts related to sampling or quenching, Pokrovski et al, 2008b) and its interpretation in terms of 149 dissolved species (e.g., choice of speciation models based on bulk solubility, Pokrovski et al, 2006). In 150 addition, a far more rigorous analysis of XAS data is now possible owing to the progress in quantum-151 chemistry and molecular dynamics modeling allowing robust constraints on electronic structures, species 152 geometries, hydration shells, and solute-solvent interactions (e. In this work, we performed in situ XAS measurements (including near-edge structure spectra or 155 XANES, and extended fine structure or EXAFS spectra) on silver chloride aqueous solutions in a wide 156 salinity range (0.7-5.9m Cl) at 200-450°C and 600-800 bar.…”

Sm-Nd geochronology, REE geochemistry and C and O isotope characteristics of calcites and stibnites from the Banian antimony deposit, Guizhou Province, China

“…Despite numerous geological studies (e.g., Xiao et al, 1992; at acidic conditions (Pokrovski et al, 2006). However, Antimony hydroxychloride complexes are minor in the neutral low-to moderate-temperature solutions (≤250-300°C) typical of Sb deposits formation; the antimony speciation in these systems is dominated by Sb(OH) 3 and Sb-sulfide species (H 2 Sb 2 S 4 0 , HSb 2 S 4 -, Sb 2 S 4 2-) (Krupp, 1988;Pokrovski et al, 2006).…”

“…However, Antimony hydroxychloride complexes are minor in the neutral low-to moderate-temperature solutions (≤250-300°C) typical of Sb deposits formation; the antimony speciation in these systems is dominated by Sb(OH) 3 and Sb-sulfide species (H 2 Sb 2 S 4 0 , HSb 2 S 4 -, Sb 2 S 4 2-) (Krupp, 1988;Pokrovski et al, 2006). Stibnite deposition is controlled mainly by temperature decrease and reduction except under alkaline conditions where acidification is the principal cause of mineralization (Williams-Jones and Norman, 1997).…”