[Inhibitory kinetic-synchronous fluorimetric determination of trace aniline]

A novel kinetic-synchronous fluorimetric method is reported for the determination of trace aniline. The method is based on the inhibitory effect of aniline on the oxidation of fluorescein by potassium bromate in the presence of surfactant -CTMAB in the acid medium. Fluorescein's oxidized product produces strong fluorescence. But its excitation and emission spectra overlap seriously. So this article adopted synchronous fluorimetric spectra to diminish spectra overlap and obtained very good sensitivity and selectivity. The detection limit for aniline is 0.3 microg x L(-1), and the linear range is 0-10 microg x L(-1). The proposed method has been applied to the determination of trace aniline in waste water and laboratory water with satisfactory results.