Gamma radiolysis of EDTA in a simulated, mixed nuclear waste

Abstract

The effects of 7-irradiation on EDTA degradation have been studied. A simulant of Hanford's complex concentrate was prepared by adding EDTA to an inorganic matrix which was formulated based on past analyses of the actual Hanford complex concentrate waste. For the radiolysis study, aliquots of the simulated waste were then 7-irradiated. Each waste sample was analyzed to monitor the appearance of degradation products. Based on the results of this study, an assessment of the impact of EDTA degradation on the management of mixed wastes is offered.

Alpha radiolysis of DOTA ligand in aqueous solutions with helium ion beams

“…Many organic compounds, like tert-butanol or methanol, are known to be very good scavengers of • OH, decreasing the H2O2 formation yield by water radiolysis (Wojnárovits et al, 2004;Pastina & LaVerne, 1999). Although there are no studies available on DOTA radiolysis, some works have reported the impact of ionizing radiation on polyaminocarboxylic acid molecules such as EDTA, HEDTA, DTPA or NTA (Bhattacharyya & Srisankar, 1976;Bibler, 1972;Höbel & von Sonntag, 1998;Toste, 1998;Zarzana et al, 2015). In the presence of ionizing radiation, these ligands are susceptible to be attacked in water by reactive species like • H and • OH radicals through hydrogen abstraction.…”

Radiation chemical effects on radiochemistry: A review of examples important to nuclear power

“…(47) is a carbon-centered radical which can then add O 2 to form a peroxyl radical. Decomposition of the peroxyl radical results in the formation of formaldehyde and ethylenediaminetriacetic acid (ED3A), both measured products [69][70][71]:…”

Experimental design of application of nanoscale iron–nickel under sonication and static magnetic field for mixed waste remediation

“…The degradation of EDTA and CA was carried out using irradiation such as gamma energy. The first order rate of ∼1 h −1 was followed for the same [14,17]. Biodegradation of EDTA followed at the rate of 15 mol h −1 of biomass content [44].…”

“…Although incineration can accomplish these objectives, it poses some formidable problems, including release of acid gases (NOx and SOx), formation of chlorinated dibenzodioxins and dibenzofurans, and release of radioactive fly-ash, which can be hard to control [15]. Other techniques for organic pollutants destruction include chemical oxidation/reduction technologies, electrochemical oxidation/reduction, biological processes, photolytic degradation, degradation using zerovalent iron and degradation based on Fenton reaction [16][17][18][19].…”