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Evaluating ion exchange resin efficiency and oxidative capacity for the separation of uranium(IV) and uranium(VI)

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Figure 1 Use of safranin-o leuco dye as a visual oxidation indicator. a) Bio-RadW AG1x8 resin in Poly-prep column including a stop-cockvalve to control flow without indicator dye showing original color of the resin; b) DowexW 1x8 resin in Pierce polystyrene column including topand bottom frits to control flow without indicator dye showing original color of the resin; c) Solution of safranin-o in the oxidized form (1 drop of1% solution in 4 M HCl); d) Anoxic safranin-o (colorless, reduced form) in 4 N HCl after reduction with Ti(III); e) Example of anoxic resin (no pre-treatment) after addition of reduced safranin-o solution with visible oxidation (pink color on resin); f) Anoxic resin after pre-treatment with Ti(III)and addition of reduced safranin-o solution (no color change observed).
Figure 2 Recovery of U(VI) from various resins under oxicconditions. Resin separation of oxic U(VI) solutions using Bio-RadWAG1x8 prefilled Poly-prep columns, Bio-RadW AG1x8 powder packedin the Poly-prep columns and DowexW 1x8 powder packed in thePoly-prep and Pierce polystyrene(*) columns showing a) cumulativerecovery of total uranium for both 4 M HCl (open symbols, U(IV))and 0.1 M HCl (closed symbols, U(VI)) column elution with dashedlines indicating where the eluent composition was changed for eachsystem and b) cumulative recovery of total uranium as U(VI) fromonly 0.1 M HCl (U(VI)) elutions.
Table 2 Summary of selected resin separation tests including treatment steps and outcome
Figure 3 U recovery from DowexW 1x8 resin under anoxicconditions with varied U(IV)/U(VI) solutions

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