A new spectrophotometric method for the determination of aniline in environmental water samples

A new spectrophotometric method has been established to determine trace ani line in water samples. A mixture solution of N-chlorosuccinimide and 8-hydr oxyquinaldine in N,N-dimethylformamide (DMF) was used to react with the ani line in water at room temperature (20 degreesC). When the solution was adju sted to pH 10-11 by adding 3 mol/L NaOH, a clear and blue-colored dye forme d immediately with the maximum absorption wavelength at 615 nm. Molar absor ptivity and detection limit were found to be 1.0x10(4) L-. mol(-1.) cm (-1) and 30 mug/L, respectively. Linearity was excellent in the concentration r ange of 0.2 to 15 mg/L aniline in water sample. The proposed method has bee n used to analyze aniline in surface and sewage water samples with the reco veries 96-103% and relative standard deviation less than 3%. It's a promisi ng method to be applied for routine analysis of aniline in water.