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Pirogova, G. N.; Zhestkova, T. P.; Voronin, Yu. V.; Panich, N. M.; Korosteleva, R. I.; Popova, N. N.; Byvsheva, I. I.; Пикaeв, A.К.

doi:10.1023/a:1020282230303

Cited by 4 publications

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“…(7), k = 8.5 0 10 6 ; (9), k = 1.5 0 10 9 ; Decomposition of H 2 C 2 O 4 in aqueous solutions exposed to radiation in a closed system is incomplete, since this acid is regenerated by reaction (3). As a result, an equilibrium observed in [11] is attained. This equilibrium is, in fact, a steady state, since slow reactions of higher-molecular-weight radiolysis products, like tartaric acid etc., occur in the system.…”

Section: Radiation-chemical Reactions In Co 2 Solutionsmentioning

confidence: 89%

“…This follows from the change in the ratio [H] : [Ox] of hydrogen atoms released in decomposition of H 2 C 2 O 4 to form CO 2 and unchanged oxalic acid. At the above 592 ERSHOV et al [11], and curve is our calculation. doses, this ratio is 0.67, 1.66, and 2.3, respectively.…”

Section: Radiolysis Products Of Oxalic Acidmentioning

confidence: 89%

“…Based on the results of studies [11,12] on exhaustive decomposition of H 2 C 2 O 4 in closed systems, we suggest the following scheme of reactions occurring in these systems.…”

Section: Exhaustive Decomposition Of H 2 C 2 O 4 Whenmentioning

confidence: 99%

“…Simulation of radiation-chemical processes in these systems is of great interest. Pirogova et al [11] studied H 2 C 2 O 4 decomposition in 600-ml closed vessels. The volume of the gas phase was 150 ml.…”

Section: Simulation Of Reactions In a Closedmentioning

confidence: 99%

“…Although the concentrations of the organic radiolysis products in the solution are not reported in [11], the approximate composition of these products and their amount can be determined from the mass balance of carbon, oxygen and hydrogen. The amount of carbon incorporated in the organic products can be expressed as follows: C pr, Ox = C 0, Ox 3 C t, Ox 3 (C gas, CO 2 + K CO 2 C gas, CO 2 )/2, where C pr, Ox is the concentration of H 2 C 2 O 4 spent for formation of organic radiolysis products; C 0, Ox and C t, Ox are the initial and current H 2 C 2 O 4 concentrations, respectively; C gas, CO 2 is the CO 2 concentration in the gas phase, recalculated for the volume of the liquid phase; and K CO 2 is the distribution coefficient of CO 2 between the gas and liquid phases taking their volumes into account.…”

Section: Radiolysis Products Of Oxalic Acidmentioning

confidence: 99%

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

2005

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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...

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Section: Radiation-chemical Reactions In Co 2 Solutionsmentioning

confidence: 89%

Section: Radiolysis Products Of Oxalic Acidmentioning

confidence: 89%

“…Based on the results of studies [11,12] on exhaustive decomposition of H 2 C 2 O 4 in closed systems, we suggest the following scheme of reactions occurring in these systems.…”

Section: Exhaustive Decomposition Of H 2 C 2 O 4 Whenmentioning

confidence: 99%

Section: Simulation Of Reactions In a Closedmentioning

confidence: 99%

Section: Radiolysis Products Of Oxalic Acidmentioning

confidence: 99%

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

2005

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A Diffusion-Kinetic Model for Radiation-Chemical Transformations of Oxalic Acid and Oxalate Ions in Aqueous Solutions

2005

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2023

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XülasəMəqalədə Qarabağda olan tarixi-dini abidələrimizin erməni işğalı dövründə terrora məruz qalması, işğaldan azad olunan ərazilərimizdə bərpa-quruculuq işlərinin aparılması, abidələrimizin bərpa olunaraq yenidən həyata qaytarılmasından bəhs edilmişdir.Məqalədə işğal dövründə ermənilərin mənfur məqsədlərinin işğal altında saxladıqları ərazilərdən Azərbaycan tarixini silməklə özlərini güya bu torpaqların qanuni sahibləri kimi təqdim etmək istəmələri vurğulanmışdır. Qeyd olunmuşdur ki, iki əsrdən çox Azərbaycan xalqına qarşı davam edən erməni təcavüzünün qurbanları təkcə minlərlə günahsız soydaşlarımız deyil, həm də yaşı min illərlə ölçülən tarixi-dini abidələrimiz, müqəddəs ocaqlarımız-məscidlər, dini ibadət yerləri, ziyarətgahlar, tarixən xalqımıza məxsus olan kilsələr, sinaqoqlar, pirlər, azərbaycanlılara məxsus yüzlərlə qəbristanlıqlar və digər tarixi mədəni abidələrimiz bihudə yerə erməni vandalizminə məruz qalmış və məhv edilərək yer üzündən silinmişdir.

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Cited by 4 publications

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

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

A Diffusion-Kinetic Model for Radiation-Chemical Transformations of Oxalic Acid and Oxalate Ions in Aqueous Solutions

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