[Study of filter-paper-substrate delay fluorescence of three quinolones].

Paper-substrate delay fluorimetry (PS-DF) for three quinolones, i.e. Pefloxacin, Norfloxacin and Pepemidic acid, were given. Various factors affecting the PS-DF intensity of quinolones, including pH condition, drying time of sample etc., were studied in detail. The experiments showed that the PS-DF intensities of three quinolones in acidic solution were stronger than those in other conditions. The proper pH was 1.6. These quinolones have wide dynamic ranges, low limit of detection and relatively small standard deviations. The method was fast with, a small amount of sample and low cost. The recovery was 98.5%-104%. The determination results of the samples were satisfactory.