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Catalytic Kinetic Spectrophotometric Determination of Trace Iron

Zhou Yong-da

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Abstract

A new catalytic kinetic method for the determination of trace iron has been developed. The method has high sensitivity and selectivity for the determining trace iron. The method is based on the discoloring reaction of neutral red by hydrogen peroxide oxidation catalyzed by trace Fe(Ⅲ) in sulphuric acid medium. The calibration curve is liner between 0～120ng/25ml for iron. The proposed method has been applied to the determination of trace iron in tea-water with the recovery of 91%～103% and the relative standard deviation (n=5) of less than 4.90%.

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What this paper is about

A new catalytic kinetic method for the determination of trace iron has been developed. The method has high sensitivity and selectivity for the determining trace iron. The method is based on the discoloring reaction of neutral red by hydrogen peroxide oxidation catalyzed by trace Fe(Ⅲ) in sulphuric acid medium. The calibration curve is liner between 0～120ng/25ml for iron. The proposed method has been applied to the determination of trace iron in tea-water with the recovery of 91%～103% and the relative standard deviation (n=5) of less than 4.90%.

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Available abstract

A new catalytic kinetic method for the determination of trace iron has been developed. The method has high sensitivity and selectivity for the determining trace iron. The method is based on the discoloring reaction of neutral red by hydrogen peroxide oxidation catalyzed by trace Fe(Ⅲ) in sulphuric acid medium. The calibration curve is liner between 0～120ng/25ml for iron. The proposed method has been applied to the determination of trace iron in tea-water with the recovery of 91%～103% and the relative standard deviation (n=5) of less than 4.90%.

Key concepts: Hydrogen peroxide, Catalysis, Calibration curve, Chemistry, TRACE (psycholinguistics), Relative standard deviation, Kinetic energy, Selectivity

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