STABILITY CONSTANTS OF NP(V) COMPLEXES WITH FLOURIDE AND SULFATE AT VARIABLE TEMPERATURES

Xia, Y. ; Friese, J.I. ; Moore, D.A. ; Rao, L.

United States. Department of Energy. Yucca Mountain Project Office.

关键词: Sulfates;    Fluorides;    Enthalpy;    38 Radiation Chemistry, Radiochemistry, And Nuclear Chemistry;    Neptunium Complexes;   

DOI  :  10.2172/884904
RP-ID  :  NA
RP-ID  :  NA
RP-ID  :  884904

美国|英语

来源: UNT Digital Library

【 摘 要 】

A solvent extraction method was used to determine the stability constants of Np(V) complexes with fluoride and sulfate in 1.0 M NaClO{sub 4} from 25 C to 60 C. The distribution ratio of Np(V) between the organic and aqueous phases was found to decrease as the concentrations of fluoride and sulfate were increased. Stability constants of the 1:1 Np(V)-fluoride complexes and the 1:1 Np(V)-sulfate and 1:2 Np(V)-sulfate complexes, dominant in the aqueous phase under the experimental conditions, were calculated from the effect of [F{sup -}] and [SO{sub 4}{sup 2-}] on the distribution ratio. The enthalpy and entropy of complexation were calculated from the stability constants at different temperatures by using the Van't Hoff equation.