The 1981 purex distribution data index

Distribution coefficients of U(VI), U(IV), Pu(IV), Pu(III), Np(VI), Np(IV) and nitric acid between aqueous nitrate solutions and 30 vol% TBP in an alkane diluent were systematically gathered from the available literature. A preceding report (KfK 2536, 1977) was revised and greatly extended by recently published data and new unpublished measurements. The compilation of this report includes a total number of 4285 distribution coefficients. Part 1 contains data on the distribution of U(VI), Pu(IV) and nitric acid, part 2 contains data on U(VI) and U(IV), part 3 contains data on U(VI), Pu(IV), Pu(III) and nitric acid in the presence of hydrazinium nitrate, part 4 contains data on Np(VI) and Np(IV) with and without the presence of U(VI). In each part of the report the distribution data are grouped according to increasing equilibrium concentrations of nitric acid and subgrouped along the respective metal concentrations in the aqueous phase. Each subgroup is segmented in 2 temperature ranges. Moreover, the data of part 1 are also ordered according to their origin. The data in part 1 were critically evaluated and apparently erroneous distribution coefficients were detected by a combined grouping-modelling procedure. (orig.)