Thermodynamic properties of platinum chloride complexes in aqueous solutions: Derivation of consistent parameters from literature data and experiments on Pt(cr) solubility at 400–475°C and 1 kbar

Geochemistry International volume 53, pages327–340(2015)Cite this article

Abstract

The solubility of Pt(cr) in acidic chloride solutions was measured at 400–475°C and P = 0.8–1.0 kbar using an autoclave technique and the analysis of the dissolved component after quenching. The PtCl −3 complex was identified as the main Pt species at experimental parameters, m(NaCl) = 0.1–3.0 mol/kg H2O and m(HCl) ∼0.01. The thermodynamic parameters of the Helgeson-Kirkham-Flowers (HKF) model were determined for Pt2+ and Pt-Cl complexes (PtCl 2−n n n = 1–4) by analysis of literature data and their adjustment with obtained results. The solubility of Pt under supercritical P-T parameters calculated using these parameters is similar to Pd solubility. The thermodynamic properties and HKF model parameters for aqueous species determined in this study were incorporated into the on-line version of the FreeGC database (http://www-b.ga.gov.au/minerals/research/methodology/geofluids/freegs_about.jsp), which allows calculation of the Gibbs free energy of system components and equilibrium constants of reactions with these species.

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Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017, Russia

    B. R. Tagirov & Ya. V. Bychkova

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    N. N. Baranova

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  1. B. R. Tagirov
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  2. N. N. Baranova
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  3. Ya. V. Bychkova
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Correspondence to B. R. Tagirov.

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Original Russian Text © B.R. Tagirov, N.N. Baranova, Ya.V. Bychkova, 2015, published in Geokhimiya, 2015, No. 4, pp. 344–356.

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Tagirov, B.R., Baranova, N.N. & Bychkova, Y.V. Thermodynamic properties of platinum chloride complexes in aqueous solutions: Derivation of consistent parameters from literature data and experiments on Pt(cr) solubility at 400–475°C and 1 kbar. Geochem. Int. 53, 327–340 (2015). https://doi.org/10.1134/S0016702915040084

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Keywords

  • platinum
  • chloride complexes
  • hydrothermal solutions
  • thermodynamic properties