Iodinated disinfection byproducts (I-DBPs) may be emerging DBPs, which are generally more toxic than chlorinated and brominated analogues.   The formation of I-DBPs depends on iodine levels in the source water and the disinfectant.  Ferrate(VI) (FeVIO42-, Fe(VI)) is an emerging disinfectant; therefore, the kinetics of the oxidation of Iodide (I-) by Fe(VI) over an acidic to alkaline pH range was examined. The rates were first-order with respect to concentrations of both Fe(VI) and I-.   Generally, the second-order rate constant, k (M-1s-1), showed a decrease with increasing pH.  The species-specific rate constants were evaluated using the equilibrium of Fe(VI) species.  The comparison of the rates of oxidation of different precursors of DBPs by Fe(VI) will be carried out.  In the presentation, the rates and mechanism of oxidation of I- by Fe(VI) will be compared with the oxidation carried by chlorine, chlorine dioxide, and ozone.

Kinetics of the oxidation of iodide by ferrate(VI)

247th National Meeting (2014)

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