Antimony(III) sulfide complexes in aqueous solutions at 30 °C: A solubility and XAS study
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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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