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Valence Stabilization of Polyvalent Uranium Ions in Presence of Some Organic Additives during Extended Gamma Irradiation of Their Aqueous Acidic Solutions

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World Journal of Nuclear Science and Technology 2015年第3期5卷 157-168页

作者： M. F. Barakat M. M. Abdelhamid Department of Nuclear Safeguards and Physical Protection Nuclear and Radiological Control Authority Cairo Egypt Nuclear Chemistry Department Atomic Energy Authority Cairo Egypt

In gamma irradiated aqueous acidic uranium solutions, tetravalent uranium ions are easily oxidized while U(VI) ions remain unchanged. In general, valence change of polyvalent metallic ions during chemical reprocessing of spent nuclear fuel solutions can lead to undesirable effects under the influence of the existing gamma radiations. Consequently, studies on valence stabilization of Uranium ions during chemical treatment in strong gamma irradiation fields seem to be highly interesting. It has been reported before that some organic compounds proved to be effective in stabilizing the valence of Fe(II) ions during extended gamma irradiation of their acidic solutions. In the present work, valence stabilization of Uranium ions in acidic solutions in presence of different classes of organic compounds has been studied. The results showed that in case of U(IV), methanol or formic acid are capable of providing about 80% protection while ethanol or acetaldehyde can provide about 70% protection. Propanol has the least protective effect i.e. about 54%. On using U(VI) instead of U(IV) in the irradiated solutions, the uranium ions were reduced and the formed U(IV) was protected as follows: formic acid or methanol can provide 69% or 63% protection respectively while ethanol, acetaldehyde or propanol can provide 50%, 35% and 24% respectively. In any case, protection exists as long as the organic additives were not completely consumed.

关键词： Valence Stabilization Uranium(IV) Ions radiolysis Protective Effect Competitive Reactions

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Valence Stabilization of Fe(II) Ions during Extended Gamma Irradiation of Their Aqueous Acidic Solutions Containing Phenol, Acetone, 4-Ethylpyridine or Hydrazine Hydrate

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World Journal of Nuclear Science and Technology 2015年第2期5卷 88-101页

作者： M. F. Barakat M. M. Abdel Hamid Nuclear and Radiological Control Authority Cairo Egypt Hot Labs Center Atomic Energy Authority Cairo Egypt

Valence stabilization of polyvalent ions in acidic solutions during gamma irradiation is an important issue in nuclear aqueous chemical technology. radiolysis and self irradiation problems encountered during chemical reprocessing of nuclear fuel or during chemical separation of transuranium elements or fission products are extremely important. Consequently studies on valence stabilization of polyvalent ions in strong gamma irradiation fields are very useful. In our previous publications, the valence stabilization of Fe(II) ions in acidic solutions during continuous gamma irradiation was achieved by using an inorganic compound;such as sodium sulfite, or some organic additives such as aliphatic alcohols, aldehyds or acids prior to irradiation. It was found that the efficiency of valence stabilization depends on the amount and chemical structure of the added compounds. In the present work, valence stabilization of divalent iron during gamma irradiation was studied in presence of some organic additives, belonging to some other classes of organic compounds such as Phenol (aromatic alcohol), Acetone (aliphatic ketone), 4-Aminopyridine (heterocyclic amino compound) and Hydrazine hydrate (aliphatic amino compound) to complement our previous studies. The results showed that valence stabilization of Fe(II) in presence of these compounds depends also on the amount and chemical structure of the additive used. Some interaction mechanisms have been proposed.

关键词： Water radiolysis Valence Stabilization Extended Gamma Irradiation Competitive Reactions Polyvalent Ions Protective Effects

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Selected Chemical Aspects of Nuclear Power Development

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World Journal of Nuclear Science and Technology 2012年第4期2卷 154-160页

作者： Andrzej G. Chmielewski Marcin Brykala Tomasz Smolinski Institute of Nuclear Chemistry and Technology Warsaw Poland

The Fukushima nuclear power plant (NPP) accident consequences are a new challenge for nuclear power development;however the sequence of the event has illustrated importance of radiation- and radiochemistry processes on the safe operation and shut down of nuclear reactor and decontamination of formed liquid and solid wastes. A chemistry program is essential for the safe operation of a nuclear power plant. It ensures the integrity, reliability and availability of the main plant structures, systems and components important to safety, in accordance with the assumptions and intent of the design. The proper implementation of these procedures minimizes the harmful effects of chemical impurities and corrosion on plant structures, systems and components. It supports the minimization of buildup of radioactive material and occupational radiation exposure as well as limiting of the release of chemicals and radioactive material to the en- vironment [1].

关键词： Chemistry Nuclear Safety Water radiolysis Radioactive Waste Treatment

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固相微萃取-气相色谱-质谱联用鉴别荚醚N,N,N′,N′-四丁基-3-氧-戊二酰胺辐射产物

固相微萃取-气相色谱-质谱联用鉴别荚醚N,N,N′,N′-四丁基-3-氧-...

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2004年全国有机质谱学术交流会

作者：张晓岚张东平杨燕琴金至清上海大学环境科学与工程系

N,N,N′,N′-四丁基-3-氧-戊二酰胺(TBOPDA)是一种新合成的萃取剂,它可以在高酸度情况下萃取铀等锕系元素,在高废液的萃取处理中具有良好的应用前景。曾有报道采用GC方法分析辐照后的气相产物,本文采用固相微萃取技术萃取TBOPDA部分挥... 详细信息

N,N,N′,N′-四丁基-3-氧-戊二酰胺(TBOPDA)是一种新合成的萃取剂,它可以在高酸度情况下萃取铀等锕系元素,在高废液的萃取处理中具有良好的应用前景。曾有报道采用GC方法分析辐照后的气相产物,本文采用固相微萃取技术萃取TBOPDA部分挥发性和半挥发性液相辐照产物, 结合GC-MS进行鉴定,确定了其液相辐照产物主要为二丁胺、二正丁基甲酰胺、二正丁基乙酰胺。结果表明这是一种简便、快速、可靠的分析方法,具有较高的分析灵敏度。

关键词： Solid-phase micro-extraction GC - MS analysis radiolysis

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