Peroxy Radical Interactions with Soil Constituents
1983
Pohlman, A. A. | Mill, T.
Interaction of peroxy (RO₂·) radicals with soil constituents in dilute aqueous solutions and suspensions at 50°C was examined using p-isopropylphenol (PIP) as a probe. Dissolved and suspended humic substances as well as suspended silicate surfaces were found to trap RO₂· radicals. Competitive trapping of RO₂· radicals occurs with 10 mg·L⁻¹ of solid suspended humic acid polymers and by 1.0% silicate suspensions containing 3–74 mg·kg⁻¹ of total organic C. Electron and H-atom transfer between RO₂· radicals and solid surfaces is attributed to the availability of electron-donating or phenolic functional groups and not to total organic C content.
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