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Peroxy Radical Interactions with Soil Constituents¹

ABSTRACT

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.

¹ Contribution from the Physical Organic Chemistry Dep., SRI International, Menlo Park, CA 94025. The work was supported by NSF Grant PFR 78-2740.

² Former Research Associate and Department Director, respectively. Senior Author is now Postgraduate Research Soil Scientist, Dep. of Plant and Soil Biology, 108 Hilgard Hall, Univ. of California, Berkeley, CA 94720.

Received for publication August 3, 1982. Accepted for publication March 25, 1983.