Study on the α-ray radiolysis product of hydroxysemicarbazide

Shuming Yang ◽  
Jiang Nie ◽  
Mingming Li ◽  
Yaya Yang ◽  
Xiaojuan Liu ◽  
2001 ◽  
Vol 79 (3) ◽  
pp. 304-311 ◽  
J M Ball ◽  
J B Hnatiw

The reduction of I2 by hydrogen peroxide, a primary water radiolysis product, has been identified as a key reaction that would influence iodine volatility in nuclear reactor accident conditions (1–3). Although there have been a number of studies of the reduction of I2, there exists a great degree of controversy regarding the intermediates involved, the effect of buffers, and the general rate law (1–9). Because the rates and the mechanism of this reaction are important in predicting the pH dependence of iodine behaviour in reactor containment building after a postulated reactor accident, we have undertaken a kinetic study of I2 reduction by H2O2 in aqueous solution over a pH range of 6–9. The experiments were performed using stopped-flow instrumentation and monitoring the decay of I–3 spectrophotometrically. The effects of buffer catalysis have been examined by comparison of kinetic data obtained in sodium barbital (5,5-diethylbarbituric acid), disodium citrate, and disodium hydrogen phosphate buffers. The effect of buffers, combined with the complex acid dependence of the rate law, explains many of the discrepancies reported in earlier literature.Key words: hydrogen peroxide, molecular iodine, kinetics, iodine volatility.

2010 ◽  
Vol 26 (04) ◽  
pp. 988-992
YU Chu-Hong ◽  
ZHANG Jia-Wei ◽  
DAI Jing ◽  

2002 ◽  
Vol 90 (7) ◽  
M. Amme

SummaryRadiolysis of water is a phenomenon which alters the prevailing conditions in the nearfield of a final geological repository for high-level nuclear waste (HLW), because the nominally anoxic conditions in the repository may change due to the production of oxidants close to the solid-liquid interface of the fuel, caused by the alpha radiolysis of water.The influence of water chemistry and oxidant concentration in the liquid phase was tested by experiments which simulate chemical radiolysis effects. Leaching experiments with solutions of de-ionized water (DI) and natural groundwater (GW) containing the water radiolysis product H

Biochemistry ◽  
1994 ◽  
Vol 33 (25) ◽  
pp. 7842-7847 ◽  
Hiroshi Ide ◽  
Kei Tedzuka ◽  
Hironori Shimzu ◽  
Yoshiharu Kimura ◽  
Andrei A. Purmal ◽  

2021 ◽  
Vol 22 (14) ◽  
pp. 7376
Naon Chang ◽  
Huijun Won ◽  
Sangyoon Park ◽  
Heechul Eun ◽  
Seonbyeong Kim ◽  

Radiolysis of chemical agents occurs during the decontamination of nuclear power plants. The γ-ray irradiation tests of the N2H4–Cu+–HNO3 solution, a decontamination agent, were performed to investigate the effect of Cu+ ion and HNO3 on N2H4 decomposition using a Co-60 high-dose irradiator. After the irradiation, the residues of N2H4 decomposition were analyzed by Ultraviolet-visible (UV) spectroscopy. NH4+ ions generated from N2H4 radiolysis were analyzed by ion chromatography. Based on the results, the decomposition mechanism of N2H4 in the N2H4–Cu+–HNO3 solution under γ-ray irradiation condition was derived. Cu+ ions form Cu+N2H4 complexes with N2H4, and then N2H4 is decomposed into intermediates. H+ ions and H● radicals generated from the reaction between H+ ion and eaq− increased the N2H4 decomposition reaction. NO3− ions promoted the N2H4 decomposition by providing additional reaction paths: (1) the reaction between NO3− ions and N2H4●+, and (2) the reaction between NO● radical, which is the radiolysis product of NO3− ion, and N2H5+. Finally, the radiolytic decomposition mechanism of N2H4 obtained in the N2H4–Cu+–HNO3 was schematically suggested.

V. Subramanian ◽  
J. M. Joseph ◽  
H. Subramanian ◽  
J. J. Noël ◽  
D. A. Guzonas ◽  

Chemical kinetic models are being developed for the γ-radiolysis of subcritical and supercritical water (SCW) to estimate the concentrations of radiolytically produced oxidants. Many of the physical properties of water change sharply at the critical point. These properties control the chemical stability and transport behavior of the ions and radicals generated by the radiolysis of SCW. The effects of changes in the solvent properties of water on primary radiolytic processes and the subsequent aqueous reaction kinetics can be quite complicated and are not yet well understood. The approach used in this paper was to adapt an existing liquid water radiolysis model (LRM) that has already been validated for lower temperatures and a water vapor radiolysis model (VRM) validated for higher temperatures, but for lower pressures, to calculate radiolysis product speciation under conditions approaching the supercritical state. The results were then extrapolated to the supercritical regime by doing critical analysis of the input parameters. This exercise found that the vapor-like and liquid-like models make similar predictions under some conditions. This paper presents and discusses the LRM and VRM predictions for the concentrations of molecular radiolysis products, H2, O2, and H2O2 at two different irradiation times, 1 s and 1 hr, as a function of temperature ranging from 25°C to 400°C. The model simulation results are then compared with the concentrations of H2, O2, and H2O2 measured as a function of γ-irradiation time at 250°C. Model predictions on the effect of H2 addition on the radiolysis product concentrations at 400°C are presented and compared with the experimental results from the Beloyarsk Nuclear Power Plant (NPP).

2009 ◽  
Vol 78 (12) ◽  
pp. 1145-1147 ◽  
Wang Jinhua ◽  
Li Chun ◽  
Bao Borong ◽  
Wu Minghong ◽  
Zheng Weifang ◽  

Biochemistry ◽  
1989 ◽  
Vol 28 (10) ◽  
pp. 4382-4387 ◽  
Karen Hubbard ◽  
Hiroshi Ide ◽  
Bernard F. Erlanger ◽  
Susan S. Wallace

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