Oxidation of Hydroxylamine by Periodate in a Continuous-Flow Stirred Tank Reactor: A New pH Oscillator

Article abstract of DOI:10.1021/j100359a009

The periodate oxidation of hydroxylamine exhibits a complex and variable stoichiometry at pH 5.There are two limiting cases.In excess periodate the products are nitrate and iodate, while in a large excess of hydroxylamine IO4^- is reduced to I^-, and the nitrogen-containing product is N2O.The formation of nitrite ion and iodine is important when neither of the reactants is present in large excess.The reaction shows clock type kinetics in closed conditions if no buffer is present.In a flow reactor sustained oscillations in +>, in color, and in redox potential are found experimentally in a narrow range of flow rate and input concentrations.A simple model is proposed to explain the oscillation.