Mechanism Of Radiolytic Degradation Research Articles

Studies on the radiolytic degradation of cellulose acetate membranes

AbstractThe effect of γ‐irradiation on the performance of wet cellulose acetate membranes in the dose range of 2.5–10 Mrads was investigated using a 60Co source. Changes in transport properties and inherent viscosity of the membranes suggested continued degradation as a result of irradiation. Solubility and specific gravity changes accompanying irradiation indicated some sort of structural aggregation occuring at higher doses. Consumption of dissolved oxygen during irradiation and the extent of deacetylation of the membrane polymer were determined to study the kinetics of the degradative process. Analysis of the end products of irradiation was attempted by UV spectroscopy. ESR spectra of membrane polymer after irradiation were analyzed to identify the free radicals generated. A tentative mechanism of radiolytic degradation causing the observed performance failure is proposed.

Chelation and radiolytic determination of lanthanides with 2,2′-oxybis-[ethyliminodi/acetic/ acid

A quantitative study of the interaction of some lanthanide ions with 2,2′-oxybis-[ethyliminodi /acetic/ acid] or 2,2′-bis [aminoethyl]ether-tetraacetic acid /BAETA/ was carried out. Stability constants of the lanthanide chelates containing 1∶1 ratio of metal to ligand were determined. A discussion of the variation of the metal chelates stability constants in the lanthanide series is given. Radiolysis of the formed chelates has also been investigated both in presence and in absence of oxygen. A radiolytic degradation mechanism is proposed and discussed.

Radiolysis of aqueous solutions of ethylenediaminetetraaceta tocobalt(II) and (III)

The radiolysis of ethylenediaminetetraacetatocobalt (II) and (III) has been studied, both in the presence and absence of oxygen, Radiolytic degradation of the metal chelate was observed. Based on the experimental data, a radiolytic degradation mechanism of the chelates is proposed and discussed.