配合物NpO_2F稳定常数的测定

DETERMINATION OF THE STABILITY CONSTANT OF NpO_2F COMPLEX

以二 (2 乙基己基 )磷酸 (HEDHP)作萃取剂 ,用溶剂萃取法测定了NpO2 F的稳定常数。当离子强度为 1 0mol/kg ,温度为 2 88,2 98,30 8,318K时 ,稳定常数 (lnβ)分别为 1 4 9± 0 0 7,1 4 7± 0 0 4 ,1 2 8± 0 0 5 ,1 0 0± 0 11。对于NpO2 + +F- =NpO2 F反应 ,其ΔG2 98,ΔH和ΔS分别为 (- 8 37± 0 2 0 )kJ/mol,(- 2 9.1± 6 0 )kJ/mol和 (- 71.1± 19.7)J/(mol·K)

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.