Experimental investigation of the stability of a chloroborate complex and thermodynamic description of aqueous species in the B-Na-Cl-O-H system up to 350°C

The solubility of chlorargyrite, AgCl_cr, was experimentally studied in NaCl solutions (0.1, 0.2, and 0.5 m) as a function of the concentration of boric acid (up to 5 m) at 70–300°C and saturated water vapor pressure. The experimental data indicated the existence of the chloroborate species B(OH)₃Cl⁻. The published data on the thermodynamic properties of aqueous complexes in the B-Na-Cl-O-H system were analyzed. The obtained HKF parameters of aqueous species can be used to calculate equilibria in the system up to 350°C. Original Russian Text ? N.N. Akinfiev, M.V. Voronin, A.V. Zotov, V.Yu. Prokof’ev, 2006, published in Geokhimiya, 2006, No. 9, pp. 937–949.