Abstract
ABSTRACTA mathematical model is derived for prediction of equilibrium between plutonium in aqueous solution and plutonium sorbed on anion exchange resin. The model is analogous to the Langmuir (BET Type I) model for adsorption. Sorption kinetics are modeled as a first order reaction with respect to the plutonium and the resin sorption site concentrations. The model predictions are correlated to previously reported experimental equilibrium data over a range of plutonium concentration from 0.0029 to 300 g Pu/L. Plutonium content of the resin pores is shown to be a significant portion of the total resin phase plutonium. Two methods are described for calculating resin porosity from experimental equilibrium data. The porosity of Dowex-1x4 resin in 7M nitric acid is calculated to be 5 to 8 vol% at high plutonium sorption. Maximum sorption capacity of the resin for plutonium is calculated to be from 87 to 93% of the stoichiometric capacity for a divalent anion.
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