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Esr Spin Trapping Evidence for So3- and .Oh Radicals in Sulfite Oxidation

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Electron spin resonance (ESR) spin trapping experiments have been carried out to investigate the mechanism of sulfite oxidation employing 5,5-dimethyl-1-pyrroline-1-oxide (DMPO) as a spin trap. The results show that sulfite autoxidation, catalyzed by Mn(II), involves not only the SO3 radicals but also the .OH radicals. An addition of H2 O2 to the sulfite aqueous medium significantly increases the .OH radical formation. This result provides new clues to the chemical mechanism of the sulfite oxidation and the sulfite toxicity.

Affiliations: 1: Department of Chemistry West Virginia University Morgantown, WV 26506, USA


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