Add time:08/31/2019         Source:sciencedirect.com

Stibnite solubility experiments and ambient temperature X-ray absorption spectroscopy (XAS) measurements of antimony in solution were undertaken to determine the aqueous speciation of Sb(III) in sulfide solutions having reduced sulfur concentrations from 0.001 to 0.1 mol kg− 1 S2 −total over the pH range of 3.5 to 12. At 30 °C, stibnite solubility curve was defined by a scheme of five species: Sb2S42 −, HSb2S4−, H2Sb2S52 −, H3SbS2O, and Sb(OH)3(aq). Equilibrium constants were determined for the following heterogeneous solubility reactions:Sb2S3s+HS−⇋Sb2S42−+H+

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