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Kinetics of Nonenzymatic Decomposition of Hydrogen Peroxide by Torrifluvents

^a Dep. of Soils and Agricultural Chemistry, Alexandria Univ., Alexandria, Egypt
^b Dep. of Soils and Waters, Tanta Univ.,Egypt

View larger version (10K): [in this window] [in a new window]   Fig. 1. Log of the pseudo-first-order rate coefficient (k*) vs. the concentration of MnO2(s) in the reaction cell for the decomposition of H2O2(aq) by Torrifluvent soil samples (T) and three synthetic Mn oxides: birnessite (B), cryptomelane (C), and pyrolusite (P); initial H2O2(aq) concentration and pH equal to 60 mmol m–3 and 7.6, respectively, at 30 ± 0.2°C.

View larger version (13K): [in this window] [in a new window]   Fig. 2. Effect of pH on H2O2(aq) decomposition by the Etay Elbaroud soil sample (40 kg m–3) for an initial H2O2 concentration of 60 mmol L–1 at 30.0 ± 0.2°C: (a) ln(Vf – V)/Vf vs. time, where Vf is the total volume of O2(g) evolved during the whole reaction and V is the volume evolved up to time t, and (b) log pseudo-first-order rate coefficient (k*) vs. pH.

View larger version (11K): [in this window] [in a new window]   Fig. 3. Log of the pseudo-first-order-rate coefficient (k*) vs. the negative log of the concentration (pL) of (a) EDTA and (b) DTPA for the decomposition of H2O2(aq) by Etay Elbaroud soil.