دورية أكاديمية
The Influence of Long-Term Gamma-Radiation and Initially Dissolved Chemicals on Aqueous Kinetics and Interfacial Processes
| العنوان: | The Influence of Long-Term Gamma-Radiation and Initially Dissolved Chemicals on Aqueous Kinetics and Interfacial Processes |
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| المؤلفون: | Yakabuskie, Pamela A |
| المصدر: | Electronic Thesis and Dissertation Repository |
| بيانات النشر: | Scholarship@Western |
| سنة النشر: | 2015 |
| المجموعة: | The University of Western Ontario: Scholarship@Western |
| مصطلحات موضوعية: | Radiation chemistry, water radiolysis, kinetics, mass transport, colloid formation, corrosion, Physical Chemistry |
| الوصف: | This thesis presents work focusing on the long-term effect of gamma-radiation on aqueous solution kinetics. Ionizing radiation drives the decomposition of water to form both oxidizing (•OH, O2, H2O2) and reducing (•eaq−, •O2−, •H, H2) chemical species. Over time, these radiolysis products can react with dissolved solutes and participate in interfacial reactions. This can lead to significant changes in the eventual solution redox condition, and gas phase composition, and in certain cases result in the formation of solid species. Understanding the long-term solution kinetics for radiolysis systems is particularly important for the improvement of chemistry control and activity transport models, such as those employed in the nuclear power industry. In order to study the chemical changes induced by exposing these aqueous systems to gamma‑radiation, species in the aqueous, gaseous and solid phases (where applicable) were monitored by a variety of techniques as a function of irradiation time. Chemical kinetics modeling was performed to both validate obtained experimental results, as well as aid in the interpretation of these results. The presence of dissolved solutes was found to impact the steady-state concentrations of the molecular water radiolysis products by competing with them for reaction with radical species. This radical scavenging lowers the rate of removal of the molecular products and allows their concentrations to reach higher levels, however the increase observed relative to pure water is dependent on pH and solute concentration. Redox active solutes that can undergo pseudo-catalytic reaction cycles with the radical species can also significantly affect the concentrations of water radiolysis products without experiencing a significant change in their net speciation. Irradiation studies with transition metal solutes were shown to generate uniform sized colloidal species in solution. The radiolytic oxidation of soluble ferrous ions to less soluble ferric species leads to the homogeneous condensation of ... |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| العلاقة: | https://ir.lib.uwo.ca/etd/2669Test; https://ir.lib.uwo.ca/context/etd/article/4107/viewcontent/PYThesis_FINAL2015_01_28.pdfTest |
| الإتاحة: | https://ir.lib.uwo.ca/etd/2669Test https://ir.lib.uwo.ca/context/etd/article/4107/viewcontent/PYThesis_FINAL2015_01_28.pdfTest |
| رقم الانضمام: | edsbas.407DB597 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |