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GUPTA, B. L., BHAT, R. M., GOMATHY, K. R., AND SUSHEELA, B. Radiation Chemistry of the Ferrous Sulfate-Benzoic Acid-Xylenol Orange System. Radiat. Res. 75, 269-277 (1978). In the dosimetric system containing 0.20 mM ferrous ammonium sulfate, 5.0 mM benzoic acid, and 0.20 mM xylenol orange in 0.05 N sulfuric acid (FBX system), benzoic acid increases the G(Fe3+) value and ferric ions form a complex with xylenol orange. This paper presents the investigations carried out regarding the reactions of H202, OH, and H in the FBX system. The OH radicals were generated by the reaction of ferrous ions with H202. In the FBX system, each H202, OH, and H leads to the oxidation of 8, 7, and 11 ferrous ions, respectively. In the absence of xylenol orange, the above values respectively are 12, 11, and 13. The rate constant of the reaction of OH radical with xylenol orange in 0.05 N H2SO4 has been measured by competition kinetics using benzoic acid and its value has been found to be 7.9 X 109 M-' sec-L. In the absence of oxygen there is no radiolytic oxidation of ferrous ions in FBX system. |
