Effect of aluminum metal surface on oxidation of iodide under gamma irradiation conditions

• Published in: Journal of radioanalytical and nuclear chemistry Vol. 308; no. 2; pp. 459 - 468
• Main Authors: Hong, Sue Young, Jung, Sang-Hyuk, Yeon, Jei-Won
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.05.2016; Springer
• Subjects: Aluminum; Aluminum compounds; Backup software; Chemical properties; Chemistry; Chemistry and Materials Science; Diagnostic Radiology; Hadrons; Heavy Ions; Inorganic Chemistry; Nuclear Chemistry; Nuclear Physics; Oxidation-reduction reaction; Physical Chemistry; Radiolysis; Gamma irradiation; Radiolysis products; oxidation; H; I; Aluminum surface; O
• ISSN: 0236-5731; 1588-2780
• DOI: 10.1007/s10967-015-4503-9

The effects of aluminum surface on I − oxidation under gamma irradiation were investigated. Without irradiation, only O 2 oxidized I − at pH < 2, and aluminum expedited the oxidation reaction. With irradiation, the radiolysis products from water and air oxidized I − into I 3 - . At pH < 2, O 2 generated by water radiolysis additionally oxidized I − . However, at pH > 6, the H 2 O 2 radiolysis product reduced I 3 - into I − . A smaller amount of I 3 - was observed in pH 1.9 and 3.3 solutions in contact with aluminum under irradiation because oxidants preferentially oxidize aluminum rather than I − . Moreover, for pH < 6.0, even less I 3 - was formed by aluminum exposed to air because air radiolysis products also preferentially oxidized aluminum.