Abstract： Under the conditions of 80℃ and in sulfuric acid medium, Fe had strong inhibitory action on the colour decolorization of neutral red oxidized by potassium bromate. There was a linear relationship between the amount of Fe and the absorbance difference of the inhibitory reaction system (absorbance A) and un-inhibitory reaction system (absorbance A0) at the wavelength of 520 nm. Based on the fact, a inhibition kinetic spectrophotometry for the determination of trace Fe was established. Under optimal experimental conditions, the linear range of the method was between 0.000 4 μg/mL and 0.064 μg/mL, and the detection limit was 1.41 × 10-4 μg/mL. The kinetic parameters were determined. It was shown that the inhibitory reaction was first-order reaction, the apparent rate constant k was 4.53 × 10-4 s-1 and the apparent activation energy was 69.25 kJ/mol. The method was used for the determination of the trace iron in natural water, with the recoveries of 99.0%-99.5% and the relative standard deviation (RSD) of 3.8%-6.2%.
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