Determination of Iron(Ⅲ)by Fiber Optic Kinetic Method with Flow Injection Analysis and Fluorescent Probe

Abstract

Abstract: The properties of anmnonaphthalene-8-sulfonic acid(ANS)as the fluorescentprobe of surface active agent have been studied.The micellar assemblies of ANS-Brij35 hasfirst been used as kinetic indicator of fluorescence.Anew method using flow injection analysis(FIA) and fiber optic to determine iron(Ⅲ)has been developed based upon the fluorescence quenching of ANS-Brij35 by the oxidation of hydrogen peroxide, in which the iron(Ⅲ)is an effective catalyst.The linear calibration curve of iron(Ⅲ)is obtained in the range of 5～300 ng/mL.The limit of detection is 2 ng/mLand the absolute detection limit is 0.2ng.The relative standard deviation is 0.27%(n=11)at the level of 20 ng/mLiron(Ⅲ).Thismethod has been applied to the determination of iron in human hair, aluminum and aluminumalloy without pre-separation.

Key words: Iron, Fluorescent probe, Catalytic kinetics, Flow injection analysis, Fiber opticspectrometry

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ZHANG Zhu-Jun, WANG Jun-Feng. Determination of Iron(Ⅲ)by Fiber Optic Kinetic Method with Flow Injection Analysis and Fluorescent Probe[J]. Chem. J. Chinese Universities, 1996, 17(4): 535.

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Determination of Iron(Ⅲ)by Fiber Optic Kinetic Method with Flow Injection Analysis and Fluorescent Probe

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