Abstract：The potassium periodate could oxidize the hydrazine yellow in sulfuric acid medium, leading to the decrease of absorbance. The addition of iron (III) could obviously catalyze this reaction. Moreover, the catalytic extent was related to the concentration of added iron (III). Based on this, the determination method of trace iron (III) by hydrazine yellow fading catalytic kinetic spectrophotometry was established. The effect of different testing conditions on sensitivity of catalytic reaction was investigated. The optimal experimental conditions were obtained: 4.0 mL of sulfuric acid; 0.9 mL of potassium periodate solution; 1.5 mL of hydrazine yellow solution; the reaction temperature of 100 ℃; the reaction time of 9 min. In addition, the influence of several common metal and nonmetal ions on the reaction was investigated, including Na+, K+, Cl- and SO42-. It was found that most common ions had no or little interference with the determination. Under the optimal determination conditions, the maximum absorption peak of system was 427 nm, the catalytic reaction rate constant was 9.8×10-4/s, and the apparent activation energy was 23.63 kJ/mol. The calibration curve was linear when the mass concentration of iron was in range of 2.4-40 μg/L, and the correlation coefficient was r=0.998 7. The detection limit of method was 2.4×10-7 g/L. The proposed method was applied to the determination of iron in natural water. The relative standard deviations (RSD, n=6) were between 1.7% and 2.4%. The found results were consistent with those obtained by flame atomic absorption method.
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LIU Bin, CHANG Wei, DU Yan-ping, YU Cui-hua, LI Wei. Determination of iron by catalytic kinetic spectrophotometry based on the oxidization fading reaction of hydrazine yellow with potassium periodate. , 2016, 36(8): 52-55.
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