Catalytic-Kinetic Fluorescent Spectrometry for Detection of Iron(Ⅲ)in Celery
In this paper,catalytic kinetics and fluorescence spectrophotometry were combined.Based on the catalytic effect of iron(Ⅲ)on the oxidation of dichlorofluorescein by potassium bromate in acid solution,a new catalytic-kinetic fluorometry method for determination of trace iron was proposed with potassium bromate-di-chlorofluorescein as the reaction system.The optimum conditions affecting the catalytic reaction have been inves-tigated.Under the optimal conditions,the iron(Ⅲ)concentration within a range of1 × 107～7 × 10-6 mg/mL has a good linear relation,and the detection limit is 6 × 10-8 mg/mL.The relative standard deviation(RSD)is 1.2％for 5 × 10-7 mg/mL iron(Ⅲ)solution(n=11).The method has the advantages of simplicity and rapid-ity,and has been applied for the detection of iron(Ⅲ)in vegetables.The recoveries between 90％～107.1％are obtained with satisfied results.
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