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The oxidation of iodide by synthetic birnessite (δ-MnO 2 ) was studied in perchlorate media in the pH range 4–8. Iodine (I 2 ) was detected as an oxidation product that was subsequently further oxidized to iodate (IO 3− ). The third order rate constants, second order on iodide and first order on manganese oxide, determined by extraction of iodine in benzene decreased with...
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