Solubility of Lead(II) Oxide and Copper(II) Oxide in Subcritical and Supercritical Water

Abstract

The solubilities of lead oxide (PbO) and copper oxide (CuO) in subcritical and supercritical water were measured at temperatures from 250 °C to 500 °C and pressures from 26 MPa to 34 MPa, in a flow-type apparatus. The solubility of lead oxide varied from 351 μmol/kg H2O at 424.9 °C and 25.9 MPa to 4406 μmol/kg H2O at 350.3 °C and 30.2 MPa. The solubility of copper oxide varied from 1.3 μmol/kg H2O at 449.8 °C and 28.0 MPa to 8.0 μmol/kg H2O at 324.9 °C and 28.1 MPa. A hydration reaction model was applied to correlate the data.