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2001•Journal of Instrumental AnalysisRequires access

Fe(III)-H_2O_2-Malachite Green System for Catalytic Spectrophotometric Determination of Trace Iron

Wang Xiao

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Abstract

A kinetic spectrophotometric method for the determination of trace Fe(Ⅲ) has been deve_loped. It is based on the discoloring oxidation reaction between malachite green and hydrogen peroxide catalyzed by Fe(Ⅲ) in the medium of HCl solution. The linear determination range is between 0 and 48μg/L of Fe(Ⅲ). A detection limit of 0.61 μg/L is achieved. The apparent activation energy of the catalytic reaction is 37.94 kJ·mol-1. The method has been applied to the determination of iron in water samples with satisfactory results.

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What this paper is about

A kinetic spectrophotometric method for the determination of trace Fe(Ⅲ) has been deve_loped. It is based on the discoloring oxidation reaction between malachite green and hydrogen peroxide catalyzed by Fe(Ⅲ) in the medium of HCl solution. The linear determination range is between 0 and 48μg/L of Fe(Ⅲ). A detection limit of 0.61 μg/L is achieved. The apparent activation energy of the catalytic reaction is 37.94 kJ·mol-1. The method has been applied to the determination of iron in water samples with satisfactory results.

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Available abstract

A kinetic spectrophotometric method for the determination of trace Fe(Ⅲ) has been deve_loped. It is based on the discoloring oxidation reaction between malachite green and hydrogen peroxide catalyzed by Fe(Ⅲ) in the medium of HCl solution. The linear determination range is between 0 and 48μg/L of Fe(Ⅲ). A detection limit of 0.61 μg/L is achieved. The apparent activation energy of the catalytic reaction is 37.94 kJ·mol-1. The method has been applied to the determination of iron in water samples with satisfactory results.

Key concepts: Malachite green, Chemistry, Detection limit, Hydrogen peroxide, Catalysis, Linear range, Spectrophotometry, Kinetic energy

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