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Citation: ZHANG An-Yun, LIU Ying, WANG Fang-Ding. Study on the Kinetics and Mechanism of Redox Reaction Between Hydroxylamine and Plutonium(Ⅳ)[J]. Chinese Journal of Applied Chemistry, ;2000, 17(2): 138-141. shu

Study on the Kinetics and Mechanism of Redox Reaction Between Hydroxylamine and Plutonium(Ⅳ)

1.
a Department of Chemistry;
2.
b Library, Shanxi Normal University, Xi'an 710062;
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c Chinese Academy of Atomic Energy, Beijing

Received Date: 5 July 1999
Available Online: 29 November 1999
Fund Project: 国家"九五"重点科技攻关项目(Y5551) (Y5551)

The kinetics and mechanism of redox reaction between hydroxylamine(HAN) and plutonium(Ⅳ) in nitric acid medium have been studied by spectrophotometry. The rate equation of the reaction is found to be -d[Pu(Ⅳ)]/dt=k[Pu(Ⅳ)]²[HAN]²/([Pu(Ⅲ)]²[H⁺]⁴) At_=3.00 mol/L and 25℃ the calculated rate constant k is (17.4±0.48) mol ³/(L³·min). A possible mechanism is proposed on the basis of the path of single-electron transfer. The ESR results show that both the opposite reaction and the oxidation reaction are the rate controlling steps: PuOH³⁺+NH₂OH⇌Pu³⁺+HNHO+H₂O
- hydroxylamine,
- plutonium(Ⅳ),
- redoxation,
- reaction mechanism,
- kinetics
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