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Pu(IV) � Nitric Acid (cont) • Pu is therefore best adsorbed on basic anion exchangers as the tetravalent species from 7.0 – 9.0 M HNO 3. • To ensure that all Pu is present as Pu(IV), the solution is typically treated with NaNO 2 at elevated temperatures. • Sometimes this treatment is preceded by the reduction of all Pu to the Pu(III) state. 50
Pu(IV) � Nitric Acid (cont) • To achieve complete and rapid elution, the Pu(IV) has to be freed from the nitrate complex. • This can be achieved by: –Reducing the Pu(IV) to Pu(III) –Lowering the nitrate concentration –Addition of a reagent forming a Pu(IV) complex with an even greater stability • The acidity of the eluent has to be high enough to prevent hydrolysis of Pu. 51
Page 1 and 2: In Cooperation with our University
Page 3 and 4: Analytical Chemistry of Uranium and
Page 5 and 6: Tracers • Factors to consider for
Page 7 and 8: Uranium Tracer Tracer Alpha Energy
Page 9 and 10: Oxidation/Reduction Chemistry • T
Page 11 and 12: U Oxidizing and Reducing Agents •
Page 13 and 14: Oxidation States of Plutonium (cont
Page 15 and 16: Pu Oxidizing and Reducing Agents
Page 17 and 18: Plutonium Hydrolysis (cont) Fractio
Page 19 and 20: Plutonium Hydrolysis (cont) • Pu
Page 21 and 22: Separation Techniques Technique (Co
Page 23 and 24: Ion Exchange Separations (cont) •
Page 25 and 26: Anion Exchange � HCl (cont.) Dist
Page 27 and 28: U(VI) � Hydrochloric Acid 0.1 - 0
Page 29 and 30: U(IV) � Hydrochloric Acid 0.5 - 2
Page 31 and 32: U(III) � Hydrochloric Acid • No
Page 33 and 34: Uranium � Hydrochloric Acid (cont
Page 35 and 36: Pu(IV) � Hydrochloric Acid (cont)
Page 37 and 38: Pu(III) � Hydrochloric Acid • P
Page 39 and 40: Pu � Hydrochloric Acid • In add
Page 41 and 42: Anion Exchange � Nitric Acid (con
Page 43 and 44: U(VI) � Nitric Acid • U(VI) is
Page 45 and 46: U(VI) � Nitric Acid (cont) Source
Page 47 and 48: Pu(III) and Pu(VI) � Nitric Acid
Page 49: Pu(IV) � Nitric Acid (cont) • T
Page 53 and 54: Pu(IV) � Nitric Acid (cont) • P
Page 55 and 56: Example of Th/U/Pu Separation 1 Th,
Page 57 and 58: Extraction Chromatography (cont)
Page 59 and 60: Extraction Chromatography (cont) Re
Page 61 and 62: UTEVA Resin (cont) [HNO 3] k’ 0.3
Page 63 and 64: TRU Resin (cont) [HNO 3] k’ 0.2 M
Page 65 and 66: TEVA Resin (cont) [HNO 3] k’ 0.3
Page 67 and 68: DGA Resin (cont) [HNO 3] k’ 0.1 M
Page 69 and 70: References 1. Morss, L. R., Edelste
Page 71 and 72: Analytical Methods 1. U.S. Environm

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