SOME EFFECTS OF DATA BASE VARIATIONS ON NUMERICAL SIMULATIONS OF URANIUM MIGRATION

摘要: Numerical simulations of migration chemicals in the geosphere depend on knowledge identities chemical species and values equilibrium constants supplied to simulators. In this work, some effects variability assumed speciation were examined, using uranium as an example. Various done systems with varying oxidation potential, pH, mator component content. A simulation including formation aqueous UO/sub 2//sup 2 +/, 2/CO/sub 3//sup 0/, 2/(CO/sub 3/)/sub -/, 4 (UO/sub 2/)/sub 3/(OH)/sub U(OH)/sub 4//sup 5//sup -/ is compared excluding +/ -/. These relied older data bases, they are a further recently published 5 U(CO/sub 6 Significant differences dissolved concentrations noted among simulations. Differences also precipitation two solids, USiO/sub 4/(c) (coffinite) CaUO/sub (calcium uranate), although solubilitymore » products solids not varied 18 refs., 9 figs., tabs.« less