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. Author manuscript; available in PMC: 2011 Feb 9.
Published in final edited form as: Environ Sci Technol. 2008 Jul 1;42(13):5014–5019. doi: 10.1021/es8001508

FIGURE 6.

FIGURE 6

Evidence that superoxide and hydroxyl radicals are produced in the presence of cerium and hydrogen peroxide. Reaction contained 10 mM H2O2, 30 mM DEPMPO, 50 μM DTPA and 100 μM Tris buffer pH 7.0. (A) One mM cerium chloride with hydrogen peroxide (baseline corrected signal); (B) simulated hydroxyl radical adduct; (C) simulated superoxide radical adduct; (D) combined hydroxyl and superoxide radical adduct. EPR parameters were as follows: 20 mW microwave power, 20.48 ms time constant, 81.92 conversion time, 0.5 Gauss modulation amplitude, field set at 3514 with a sweep width of 200 Gauss.