Hydrolyzed U

Figure 7. Soil metabolism of the products resulting from U.V.-ozonation of coumaphos and microbially hydrolyzed/U.V. ozonated coumaphos. C02 released from U-benzyl- C-coumaphos was measured in blometer flasks by trapping In potassium hydroxide and counting in a liquid scintillation counter. Controls contained soil that had been autoclaved one time but were not kept sterile.

Studies on the H-type animal ferritins to elucidate the mechanism of Fe oxidation show that the ferroxidase center catalytically converts two Fe and one dioxygen to a diferric oxo/hydroxo mineral precursor and hydrogen peroxide via a diferric peroxo intermediate.Overall these reactions can be summarized in Equations (1) and (2), where represents the apoprotein of net charge z, [Fe2-Pf " a diferrous ferroxidase complex, and [Fe20(0H)2-P] a hydrolyzed /u-oxo-bridged iron(III) complex at the same site. Thus in the ferroxidation reaction hydrogen peroxide is produced from the two-electron reduction of dioxygen at the diiron site (Equation... 

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