The formation of hydrogen peroxide in bidistilled water under the influence of UV-C radiation from a low-pressure mercury lamp DKB-9 was studied. The yield of hydrogen peroxide was (1 ± 0.2) · 10−7 mol (ls) −1. The wavelengths of radiation are estimated, under the influence of which the formation of H2O2 is possible. It was assumed that the intermediate product of the reaction formed directly under the action of radiation is the radical HO2•/O2•−. Oxidation-reduction reactions in aqueous solutions containing F e2+, F e3+ and I− ions at pH values from 0.8 to 8.1 were studied for its identification. The quantum yield of the HO2• radicals in an acidic medium under the action of mercury lamp radiation is 0.015 ± 0.005
$^1$Skobeltsyn Institute of Nuclear Physics, Moscow State University,\
$^2$Nizhny Novgorod State Medical Academy
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