Reduction potentials Fe

The standard reduction potential for the CriOv VCr couple is +1.38 V, so it can oxidize any couple whose reduction potential is less than +1.38 V. Since the reduction potential for the Fe /Fe couple (+0.77 V) is less positive than Cr2O7 7Cr reduction potential, Fe" will be oxidized to Fe by dichromate. The reduction potential for the Clj/Cr couple (+1.36 V) is slightly less positive than that of the couple, so a side reaction... 

Elemental Iron (Fe(0)) is used as a reductant for remediation of namral water halocarbon contamination (reduction potential Fe(0) —0.447 V). PFOS and PFOA have been decomposed with Fe(0). To accelerate the reaction, the process can be carried out under subcritical water condition. The degradation of PFOA and PFOS has been monitored under such conditions within an argon atmosphere (T 350°C, pressure 200 atm.). In this extreme environment, PFOS degraded with a half-life of 45 min and with a fluoride yield of 55% after 6 h [53]. The hydrated electron is a very strong reductant. Compared to most other reactants (e.g., SO/") it reacts relatively fast with perfluorinated carboxylic acids (CF3COO", C3F7COO" and CyFisCOO A = 10 s" [54],)t < 2.6 x 10 M s [55]). Besides pulse... 

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