Synthetic waste chemical mechanism studies

摘要

This research involved three main tasks: Kinetic studies of gas evolution and metal complexant decomposition in simulated waste media (SWM); Product identification from metal complexant decomposition in SWM; and Determination of the pathway by which N(sub 2)O, N(sub 2), and NH(sub 3) are formed in SWM. Results are given on these 3 tasks under the following subtitles: 1. Kinetic studies--Reactions of HEDTA in SWM at different temperatures; Determination of the activation energies for gas formation in HEDTA decomposition under argon; Kinetics and mechanism of thermal degradation of glycolate in SWM; A possible explanation for the temperature dependence of gaseous product ratios for reactions of HEDTA and glycolate; Stoichiometry and kinetics of decomposition of nitrosamines; and Factors affecting the reactions of HEDTA, EDTA, and related compounds in SWM; 2. Product identification--Identification of HEDTA degradation products using (sup 13)C NMR spectroscopy; Identification of irradiated HEDTA degradation products using NMR; Degradation of model systems in SWM; and Role of Al in degradation of organic complexants; 3. Source of gases--Reactions in SY1-SIM-91B mixtures utilizing N-15 labelled reagents; Decomposition of nitrous oxide; Mechanistic pathways for formation of gases containing nitrogen from nitrite; and A redox analysis of HEDTA decomposition--How much ammonia might be formed.