Solvent Extraction of Gd from Chloride Solution with PC88A

Abstract

Solvent extraction experiments of Gd from chloride solution with PC88A were conducted at different extraction conditions. Solvent extraction reaction was identified from the experimental results using a graphical method, and the corresponding effective equilibrium constant was determined by analyzing the ionic equlibria in a GdCl₃ solution. In the experimental ranges investigated in this study, i.e., [GdCl₃]≤0.3 kmol/m³, [PC88A]_org≤3.0 kmol/m³ and initial pH≤2.3, solvent extraction reaction of Gd with PC88A and the corresponding effective equilibrium constant were obtained as follows Gd³⁺+2H₂A_2,org=GdA₃HA_org+3H⁺, K_ex,eff=2.8×10⁻¹.