Stability and structure of platinum sulfide complexes in hydrothermal fluids

Knowledge of the chemical speciation of platinum and the solubility of Pt-bearing minerals in hydrothermal fluids is required to assess Pt transport, remobilization and concentration in the Earth’s crust. In this study, we combined PtS(s) solubility measurements in a hydrothermal reactor allowing fl...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 2022-11, Vol.336, p.407-422
Main Authors: Laskar, C., Bazarkina, E.F., Kokh, M.A., Hazemann, J.-L., Vuilleumier, R., Desmaele, E., Pokrovski, G.S.
Format: Article
Language:English
Subjects:
Chemical Sciences
Earth Sciences
Geochemistry
Hydrothermal fluid
Material chemistry
Mineralogy
Molecular dynamics
or physical chemistry
Platinum sulfide complexes
Sciences of the Universe
Solubility
Stability constant
Theoretical and
X-ray absorption spectroscopy
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Summary:Knowledge of the chemical speciation of platinum and the solubility of Pt-bearing minerals in hydrothermal fluids is required to assess Pt transport, remobilization and concentration in the Earth’s crust. In this study, we combined PtS(s) solubility measurements in a hydrothermal reactor allowing fluid sampling, in situ X-ray absorption spectroscopy, and first-principles molecular dynamics simulations to systematically investigate the structure, composition and stability of Pt sulfide complexes in model aqueous H2S-bearing solutions up to 300 °C and 600 bar. The results demonstrate that tetrahydrosulfide, PtII(HS)42–, is the major Pt-bearing complex in aqueous solutions saturated with PtS(s) over a wide range of dissolved hydrogen sulfide concentrations, from 
ISSN:0016-7037
1872-9533
DOI:10.1016/j.gca.2022.08.015