Describir: Measurement of Solubility of CO<sub>2</sub> in NaCl, CaCl<sub>2</sub>, MgCl<sub>2</sub> and MgCl<sub>2</sub> + CaCl<sub>2</sub> Brines at Temperatures from 298 to 373 K and Pressures up to 20 MPa Using the Potentiometric Titration Method