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Trace amount of iron(Ea) and zirconium(IV) can be determined by using their catalytic effects on the hydrogen peroxide-iodide reaction in the acidic environment. The reaction rate was followed by measuring the concentration of iodide ion by means of an iodide ionselective electrode. The most suitable concentrations of hydrogen peroxide, potassium iodide, and hydrochloric acid for the determination of iron(EU) and zirconium(IV) were found to be 0.02 M and 4 mM, 0.1 mM and 1.0 mM, 0.55 M and 4 mM, respectively. The calibration curves with good proportionality were obtained in the range of 5 to 160 μM for iron(Ea) and 1.0 to 12.0 μM for zirconium(IV)

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Catalymetric determination of iron(III) and zirconium(IV) by their effects on the hydrogen peroxide-iodide reaction with the aid of iodide ion-selective electrode.