Rate constant for the reaction of the H atom with H2O2 in aqueous solution

Ершов, Б. Г.; Gordeev, A. V.; Kelm, M.; Janata, E.

doi:10.1016/s0969-806x(03)00146-4

Cited by 16 publications

(11 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model includes 31 reactions. All rate constants of these reactions were measured experimentally [3,4] and are consistent with published experimental data on radiolysis of water and aqueous solutions of O 2 , H 2 , and H 2 O 2 . The similar reaction scheme of water radiolysis was used in [6,7].…”

supporting

confidence: 85%

“…The results of these calculations can be used to describe chemical reactions in LRW in deep reservoir beds. During storage of waste, oxygen is gradually consumed for oxidation of organic components of LRW and nitrogen oxides (N 2 O) are formed by reduction of HNO 3 . The results of our calculations show that radiation-chemical and thermal decomposition of H 2 C 2 O 4 and other carboxylic acids contained in LRW or forming during their storage will accelerate with time owing to deoxygenation of LRW by oxidation of organic compounds and formation of nitrogen oxides by reduction of HNO 3 .…”

Section: Radiolysis Of Solutions Containing Oxygen and N 2 Omentioning

confidence: 99%

“…The model of radiation-chemical transformations of aqueous solutions of H 2 C 2 O 4 was based on our previous scheme of chemical reactions occurring in pure water and aqueous solutions of O 2 , H 2 , and H 2 O 2 on exposure to radiation [1]. Recently [2], this model was supplemented with refined rate constants of some reactions measured in [3]. The model includes 31 reactions.…”

mentioning

confidence: 99%

“…These data can be used to substantiate this model and check its main parameters as well as to develop the required software. In addition, development of a model adequately describing radiolysis of aqueous solutions of a simple compound such as H 2 C 2 O 4 can be a first step in developing general approach to simulation of radiationchemical transformations of more complex compounds such as CH 3 COOH and acetate ions, HNO 3 and nitrate ions, etc. It should be noted also that H 2 C 2 O 4 is formed in the course of radiolytic oxidative decomposition of CH 3 Model of water radiolysis.…”

mentioning

confidence: 99%

“…In addition, development of a model adequately describing radiolysis of aqueous solutions of a simple compound such as H 2 C 2 O 4 can be a first step in developing general approach to simulation of radiationchemical transformations of more complex compounds such as CH 3 COOH and acetate ions, HNO 3 and nitrate ions, etc. It should be noted also that H 2 C 2 O 4 is formed in the course of radiolytic oxidative decomposition of CH 3 Model of water radiolysis. The model of radiation-chemical transformations of aqueous solutions of H 2 C 2 O 4 was based on our previous scheme of chemical reactions occurring in pure water and aqueous solutions of O 2 , H 2 , and H 2 O 2 on exposure to radiation [1].…”

mentioning

confidence: 99%

See 4 more Smart Citations

Mathematical Simulation of Radiolysis of Oxalic Acid to Gaseous Products, as Applied to Radiochemical Problems

2005

View full text Add to dashboard Cite

A diffusion kinetic model of radiation-chemical transformations of oxalic acid in aqueous solutions was developed as applied to LRW management. The model describes the experimental results on oxalic acid decomposition to gaseous products in a wide pH range, in the presence and in the absence of oxygen and in solutions saturated with nitrous oxide. Liquid single-and two-phase (liquid3gas) systems formed in disposal of LRW in deep reservoir beds can be calculated using this model. Liquid radioactive wastes (LRWs) containing various organic and inorganic compounds are formed and accumulated in the course of processing spent nuclear fuel (SNF). These wastes are stored in open surface constructions and metal tanks or are disposed of in geological formations. Radiation-chemical reactions occurring during storage of LRW change the speciation of radionuclides contained in the wastes and result in formation and accumulation of gaseous products. To ensure the safety of LRW management, these processes should be comprehensively studied.The aim of this study was to develop a mathematical model of decomposition of oxalic acid and oxalate ions in acidic, neutral, and weakly basic aqueous solutions. Since oxalic acid is widely used in processing of SNF, large volumes of LRW containing oxalic acid are accumulated. The choice of this acid was determined by the fact that the mathematical model of its radiolysis can be used to describe real radiochemical and thermal transformations involving this acid. A great body of experimental data on radiolysis of solutions of H 2 C 2 O 4 and oxalate solutions favors successful development of this model. These data can be used to substantiate this model and check its main parameters as well as to develop the required software. In addition, development of a model adequately describing radiolysis of aqueous solutions of a simple compound such as H 2 C 2 O 4 can be a first step in developing general approach to simulation of radiationchemical transformations of more complex compounds such as CH 3 COOH and acetate ions, HNO 3 and nitrate ions, etc. It should be noted also that H 2 C 2 O 4 is formed in the course of radiolytic oxidative decomposition of CH 3 COOH. Hence, the main parts of the model under development can be used to create a new model of radiation-chemical transformations of LRW containing CH 3 COOH and HNO 3 . This general model can predict changes in the chemical compositions of LRW and gas evolution in formations and hence can determine safe operation conditions of underground disposal sites. DEVELOPMENT OF THE MODEL, COMPARISON OF EXPERIMENTAL DATA, AND DISCUSSIONFirst, we developed a model of radiolysis of pure water and checked how this model describes available experimental data. The next step was to develop a model of radiolysis of aqueous solutions of H 2 C 2 O 4 . Finally, to assess practical applicability of the model, we checked how it describes the available experimental data.Model of water radiolysis. The model of radiation-chemical transformations of aqueous solutions o...

show abstract

supporting

confidence: 85%

Section: Radiolysis Of Solutions Containing Oxygen and N 2 Omentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Mathematical Simulation of Radiolysis of Oxalic Acid to Gaseous Products, as Applied to Radiochemical Problems

2005

View full text Add to dashboard Cite

show abstract

The Reaction of Muonium with Hydrogen Peroxide in Aqueous Solution

Percival,

Brodovitch

2023

ChemPhysChem

View full text Add to dashboard Cite

Rate constants for the reactions of muonium (Mu) (the ultralight isotope of the hydrogen atom) with H2O2 in H2O and D2O2 in D2O have been determined at various temperatures and pH (pD) values. The data are consistent with the three reactions: Mu + H2O2 ‐‐> products Mu + HO2‐ ‐‐> products Mu + OH‐ ‐‐> products and the equivalent for the deuterated entities. A significant positive H/D isotope effect was found for the undissociated peroxide, while for the anions the effect was negligible or slightly in the opposite direction. In addition, for concentrated solutions of peroxide a study of the muon spin polarization as a function of applied transverse magnetic field yielded results consistent with the rate constants determined from the direct decay measurements, and indicated that the reaction products are diamagnetic, most likely MuH and MuOH, i.e. no muoniated radical products are formed. These results are potentially relevant for management of radiolysis products in the nuclear industry.

show abstract