The Fenton reaction, the oxidation of ferrous iron by hydrogen peroxide (H2O2), is typically assumed to be a source of hydroxyl radical (HO•) in natural systems, however, formation of HO • in this process is strongly dependent upon solution pH and the ligand environment, with HO• only formed when Fe(II) is organically complexed. In this study we examine the formation of HO • when Fe(II)-NOM complexes are oxidized by H2O 2 using phthalhydrazide as a probe for HO•. We demonstrate that HO• formation can be quantitatively described using a kinetic model that assumes HO• formation occurs solely from the reaction of Fe(II)-NOM complexes with H2O2, even though this reaction is sufficiently slow to play only a negligible role in the overall oxidation rate of total Fe(II). As such, NOM is seen to play a dual role in circumneutral natural systems in stabilizing Fe(II) toward oxidation by H2O2 while enabling the formation of HO• through this oxidation process. © 2012 American Chemical Society.
CITATION STYLE
Miller, C. J., Rose, A. L., & Waite, T. D. (2013). Hydroxyl radical production by H2O2-mediated oxidation of Fe(II) complexed by suwannee river fulvic acid under circumneutral freshwater conditions. Environmental Science and Technology, 47(2), 829–835. https://doi.org/10.1021/es303876h
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