[Study on the determination of ciprofloxacin by the terbium (Ill) ion fluorescence probe sensitized by the surfactant].

The experiments indicated that terbium(III) ion could complex ciprofloxacin, then emitted the characteristic fluorescence of terbium(III) ion. When the surfactant of SDBS was added, the fluorescence intensity of the system was greatly increased. From this, a sensitive method of determining the ciprofloxacin was developted. The fluorescence intensity was determined by a 1 cm quartz cell with the excitation wavelength of 300 nm and the emission wavelength of 545 nm. The optimal conditions are as follows: pH 8.0-8.5, the concentration of terbium(III) is 5.0 x 10(-5) mol x L(-1), the surfactant concentration of SDBS is 8.0 x 10(-4) mol x L(-1). The linear range is 2.5 x 10(-6) mol x L(-1) -2.0 x 10(-8) mol x L(-1), and the detection limit (S/N = 3) is 4.0 x 10(-9) mol x L(-1). The presented method was applied to determine the real pharmaceuticals of ciprofloxacin.