Effect of gamma-ray irradiation on the deoxygenation of salt-containing water using hydrazine

Motooka, Takafumi; Sato, Tomonori; Yamamoto, Masahiro

doi:10.1080/00223131.2013.773159

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…•+ , • N 2 H 3 , and NH 3 are formed after the reactions shown in Equations ( 13) and (14). Among these products, N 2 H 4…”

Section: Radiolysis Of Hydrazine In Acidic Solutionmentioning

confidence: 99%

“…They concluded that N 2 H 4 exists mainly as N 2 H 5 + or N 2 H 6 2+ in the acidic solution, both of which cause rapid consumption of NO 3 ● radicals. Motooka et al also reported that the deoxygenation reaction with radiolysis of N 2 H 4 can be suppressed by salt in the water in the γ-radiation field [ 14 ]. In this way, the molecular structure of N 2 H 4 after radiolysis and the decomposition mechanism of the N 2 H 4 depend on the composition of the solution.…”

Section: Introductionmentioning

confidence: 99%

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Hydrazine Radiolysis by Gamma-Ray in the N2H4–Cu+–HNO3 System

Chang

Won

Park

et al. 2021

IJMS

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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.

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“…•+ , • N 2 H 3 , and NH 3 are formed after the reactions shown in Equations ( 13) and (14). Among these products, N 2 H 4…”

Section: Radiolysis Of Hydrazine In Acidic Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrazine Radiolysis by Gamma-Ray in the N2H4–Cu+–HNO3 System

Chang

Won

Park

et al. 2021

IJMS

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“…In our previous study, we detected H 2 O 2 in artificial seawater irradiated by gammaray (8). To evaluate the oxidation power of H 2 O 2 , we obtained cathodic polarization curves of platinum in the artificial seawater with and without H 2 O 2 at room temperature.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Pitting Potential of Zircaloy-2 in Artificial Seawater under Gamma-Ray Irradiation

et al. 2013

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Pitting potentials of zircaloy-2 in artificial seawater were measured as a function of chloride concentration or solution temperature with and without gamma-ray irradiation. The corrosion potentials of zircaloy-2 were also measured over 720 h. The pitting potential with gamma-ray irradiation was slightly greater than that without the irradiation. In both cases with and without the irradiation, the corrosion potentials of zircaloy-2 did not exceed the pitting potential. The pitting potential under irradiation was decreased with increasing chloride concentration and/or solution temperature.

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“…In our previous study, H 2 O 2 at a level of a few ppm was detected in the ASW after gamma-ray irradiation for 1 h [11]. In order to evaluate the oxidation power of H 2 O 2 , cathodic polarization curves of platinum in the ASW with and without H 2 O 2 at room temperature were measured and analyzed.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Effect of gamma radiolysis on pit initiation of zircaloy-2 in water containing sea salt

Motooka

Komatsu

Tsukada

et al. 2014

Journal of Nuclear Science and Technology

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In spent fuel pools at the Fukushima Daiichi Nuclear Power Station (1F), seawater was injected for cooling purposes after the tsunami disaster in March 2011. It is well known that the chloride in the seawater has the potential to cause localized corrosion (e.g., pitting corrosion) in metals. In this study, we evaluated the pitting potentials of zircaloy-2, the material used in the fuel cladding tubes in 1F, as a function of chloride concentration. To accomplish this, we used artificial seawater under gamma-ray irradiation and investigated the effect of radiolysis on pit initiation of zircaloy-2 in water containing sea salt. Changes in the composition of water containing sea salt were analyzed as well, both before and after gamma-ray irradiation. The characteristics of the resultant oxide films formed on zircaloy-2 were evaluated by X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy. The experimental results showed that the pitting potential under irradiation was slightly higher than that under conditions in which no radiation was present, and that the pitting potential decreased with increasing chloride concentration in the presence as well as the absence of radiation. Solution analyses for water containing sea salt showed that hydrogen peroxide was generated by irradiation. The oxide film was composed of zirconium oxide and was made thicker during the irradiation. The higher pitting potential could thus be explained by the capacity of hydrogen peroxide to oxidize the surface and enhance oxide film formation. Under gamma-ray irradiation, the zircaloy-2 surface with an oxide film formed by radiolysis products was found to be resistant to pitting in the presence of chloride.

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Effect of gamma-ray irradiation on the deoxygenation of salt-containing water using hydrazine

Cited by 9 publications

References 12 publications

Hydrazine Radiolysis by Gamma-Ray in the N2H4–Cu+–HNO3 System

Hydrazine Radiolysis by Gamma-Ray in the N2H4–Cu+–HNO3 System

Pitting Potential of Zircaloy-2 in Artificial Seawater under Gamma-Ray Irradiation

Effect of gamma radiolysis on pit initiation of zircaloy-2 in water containing sea salt

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