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In the paper the trapping of the O2 radical by the nitrone a-(4-pyridyl1-oxide)-N-tert-butylnitrone (POBN) compound was investigated. The O2 radicals were generated by the nonFenton reaction of water solutions of KOH and H2O2 reagents. The ESR spectrum of POBN : O2 adduct can be recorded under carefully selected concentration of components. The best spectra were obtained for 6% KOH and 6% H2O2.
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