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Electron paramagnetic resonance (EPR) investigations were performed with a two-way and a three-way flow technique in order to follow the reaction of sulfhydryls and disulfides with various organic free radicals. The organic compounds were attacked with OH or NH2 radicals produced in a ${\rm Ti}^{3+}+{\rm H}_{2}{\rm O}_{2}({\rm NH}_{2}{\rm OH})$ system and subsequently reacted with RSH or RSSR compounds. Direct evidence of hydrogen transfer from RSH to both abstraction and addition radicals has been obtained. For disulfides a cation-radical mechanism has been advanced in order to explain the disappearance of free radicals when the latter react with such compounds.

EPR of Fast Repair Reactions by Sulfhydryl and Disulfide Compounds in Aqueous Solutions