Zhang Hua-shan
2013
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Journal
Journal of Analytical Science
Abstract
The addition of fluoride to the fluorescence system of Al(Ⅲ)-8-hydroxyquinoline-5-sulphonic acid complex(Al(Ⅲ)-HQS)(λex=365 nm,λem=494.4 nm) in HAc-NaAc buffer(pH 4.90) solution leads to immediate fluorescence inhibition,which is proportional to the amount of fluoride.Based on this finding,a novel spectrofluorimetic method for the determination of fluoride has been developed.The linear calibration range was from 0.2 to 3.5 μg·mL-1 and the detection limit was 10 ng·mL-1.Ascorbic acid and 1,10-phenanthroline were used to eliminate the interferences of Fe(Ⅲ),Cu(Ⅱ) and Ni(Ⅱ).The proposed method has the advantages of high selectivity,simplicity and rapidity and has been applied to the determination of fluoride in water and toothpaste with recoveries of 96.2%-104.0%.The results obtained from the certified reference material by the present method agreed with the certified values.