The reduction of ferrate(VI) to ferrate(V) by ascorbate |
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Authors: | J E Cyr B H Bielski |
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Institution: | Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973. |
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Abstract: | The reduction of ferrate(VI) by ascorbate has been studied under anaerobic conditions in the pH range between 6.8 and 11.5 at 24 degrees C. A mechanism is proposed that is consistent with the observed rate constants k11 (HFeO4- + AH-) = (5.6 +/- 0.6) x 10(6) M-1 s-1, k12(FeO4(2-) + AH-) = (1.3 +/- 0.1) x 10(6) M-1 s-1 and the pK(HFeO4- in equilibrium with H(+) + FeO4(2-) = 7.9. Stoichiometric studies show that at high ratios of AH-]/FeO4(2-)], one ferrate(VI) oxidizes three molecules of ascorbate to the corresponding ascorbyl (A-) radicals. |
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