Thermodynamic Description of Chloride, Hydrosulfide,
and Hydroxo Complexes of Ag(I), Cu(I), and Au(I)
at Temperatures of 25frame0500frame1C and Pressures of 1frame22000 bar

N. N. Akinfiev* and A. V. Zotov**

*Moscow State Geological Prospecting Academy (MGPA), ul. Miklukho-Maklaya 23, Moscow, 117873 Russia


**Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences,
Staromonetnyi per. 35, Moscow, 109017 Russia


Received January 17, 2000

Abstract—The available experimental data on the stability constants of chloride, hydrosulfide, and hydroxo
complexes of Ag(I), Cu(I), and Au(I) under hydrothermal conditions were processed. The procedure employed
the Helgeson–Kirkham–Flowers (HKF) equation of state and approximate estimates of the model parameters
based on the isocoulomb principle and the model of ion associations. The resulting set of the thermodynamic
properties of aqueous species allows the evaluation of equilibria in the system Ag(I)–Cu(I)–Au(I)–S(II)–Cl–O–
H in a wide range of temperatures (25–500°C) and pressures (1–2000 bar).

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