Abstract
Aqueous solutions of nitrilotriacetic acid (NTA) were irradiated with gamma-rays. In deaerated acidic solutions G (IDA, iminodiacetic acid) was found to be 3.0 and in aerated solutions 2.7. Both H and OH radicals abstracted alpha hydrogen from the NZA molecule. The dehydrogenated radical disproportionated to NTA and IDA; however in presence of air, the radical added with O2 to give peroxy intermediate which was hydrolyzed to IDA and HO2. The rate constants, for the reaction of OH-radical with NTA at pH 2.0, 6.0 and 10.0 as determined by competition kinetic methods were 0.61·108, 5.5·108 and 42·108 dm3·mol−1·s−1, respectively. These indicated that the unprotonated form of NTA is more reactive than its protonated form. This has been attributed to the deactivation of alpha-hydrogen centers by protons through inductive effect.
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