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

Table 2 Summary of selected resin separation tests including treatment steps and outcome

Resin	Column Type	Oxic or anoxic conditions	Ti(III) treatment	Initial [U_tot] (μM)^a	U_tot Recovered (%)^a	Initial U(IV) (%)	Initial U(VI) (%)	Recovered as U(IV) (%)^b	Recovered as U(VI) (%)^b
Bio-Rad AG1x8 prefilled	Bio-Rad Poly-prep	Oxic	No	2.1	72	0	100	0	100
Bio-Rad AG1x8 prefilled	Bio-Rad Poly-prep	Oxic	No	22.2	86	0	100	0	100
Bio-Rad AG1x8 powder	Bio-Rad Poly-prep	Oxic	No	2.1	92	0	100	0	100
Dowex 1x8 powder	Bio-Rad Poly-prep	Oxic	No	2.1	100	0	100	0	100
Dowex 1x8 powder	Pierce polystyrene	Oxic	No	2.1	100	0	100	0	100
Bio-Rad AG1x8 prefilled	Bio-Rad Poly-prep	Anoxic	No	2.1	81	36	64	0	100
Dowex 1x8 powder	Pierce polystyrene	Anoxic	No	8.7	100	98	2	86	14
Dowex 1x8 powder	Pierce polystyrene	Anoxic	Yes	8.7	100	98	2	98	2
Dowex 1x8 powder	Pierce polystyrene	Anoxic	Yes	1.8	100	0	100	0	100
Dowex 1x8 powder	Pierce polystyrene	Anoxic	Yes	2.8	100	100	0	100	0
Dowex 1x8 powder	Pierce polystyrene	Anoxic	Yes	2.1	100	10	90	11	89
Dowex 1x8 powder	Pierce polystyrene	Anoxic	Yes	1.8	100	48	52	47	53

a. 1 mL of uranium solution added to resin, uncertainty in recovered U_tot was 3%.
b. Uncertainty in speciation recovery was 1%.

ISSN: 1467-4866