Abstract
Aqueous solutions of ferric ethylenediamine tetraacetate (F) at pH 1 were irradiated with X-rays both in the presence and in the absence of dissolved oxygen. Radiolytic yields of decomposition of F were determined. Formaldehyde and ferrous ion were also detected amongst the radiolysis products. It has been concluded that the radiolysis is initiated by attack both at the ligand and at the central metal ion of the metal chelate by the free radicals derived from water. A reaction mechanism for the radiolytic degradation of F in aqueous solution has been described. Effects of ferrous ion and methanol on the course of radiolysis were also investigated. From such competition kinetic studies the ratios of the rate constants k OH+Fe 2+ k OH+F and k OH+F k OH+CH 3 OH were found to be 0·48 and 1·7 respectively.
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