DETERMINATION OF THE STABILITY CONSTANT OF NpO_2F COMPLEX

The stability constants (ln β ) of NpO 2F complex in 1.0 mol/kg NaClO 4 solution at 288,298,308 and 318 K have been determined to be 1.49±0.07, 1.47±0.04,1.28±0.05 and 1.00±0.11 by solvent extraction technique with HEDHP. For the reaction of NPO 2 ++F -=NpO 2F, its Δ G 287 ,Δ H and Δ S are calculated to be (-8.37±0.20) kJ/mol, (-29.1±6.0) kJ/mol and (-71.1±19.7) J/(mol·K), respectively.