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This article in SSSAJ

  1. Vol. 47 No. 5, p. 922-927
    Received: Aug 3, 1982
    Accepted: Mar 25, 1983

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Peroxy Radical Interactions with Soil Constituents1

  1. A. A. Pohlman and
  2. T. Mill2



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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