[Highly sensitive fluorescent reaction of acridine red with chromium (VI) and its application].

A simple and highly sensitive fluorimetric method for the determination of Cr(VI) was developed in the present paper. The method is based on the fluorescence enhancement of acridine red with Cr(VI) in the sulfuric acid medium. The effects of some experimental conditions on the determination of Cr(VI) were investigated in detail. The detection limit for Cr(VI) is 0.6 microg x L(-1), and the linear range of the determination is 2.0-32 microg x L(-1). The relative standard deviation of 11 replicate measurements is less than 2.0%. The proposed method has been successfully used to determine Cr(VI) in electroplating solution, waste chromic acid mixture, and alloy steel samples. The results obtained were compared with the certified values of Cr(VI) in standard samples and those provided by 1, 5-diphenylcarbazide method with satisfaction.