Fig. 10. Variation of distribution coefficient (a) with pH, (b) increasing molar concentration of Na⁺. The initial concentration was 6 ppm, the V/m ratio was 1000 mL g^–1 and (c) kinetics of individual UO₂²⁺ ion-exchange vs. time (1 ppm, V/m ratio was 1000 mL g^–1 and pH ∼ 7).