Abstract
A complementary study of hydroxyl radical formation in the depleted uranium (DU)-hydrogen peroxide (H2O2) system and the effect of biosubstances on the system were examined using the spin-trapping method. Hydroxyl radical was formed in the uranyl ion (UO22+), 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), and hydrogen peroxide (H2O2) mixture solution. The pseudo first order rate constants of DMPO-OH formation were estimated to be 0.033 s−1 for UO22+-H2O2-DMPO solution and 0.153 s−1 for UO2+-H2O2-DMPO solution. The obtained results indicated that the hydroxyl radical formation in the UO22+-H2O2 solution could be described as a stepwise reaction process including the reduction of UO22+ to UO22+ by H2O2 and the Fenton-type reaction of UO2+ with H2O2. Biosubstances, such as proteins, amino acids and saccharides, decreased the DMPO-OH formation, which was caused by the direct hydroxyl radical scavenging and the suppression of hydroxyl radical formation by coupling with uranyl ion.
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