Determination of Phenol and Aniline in Refinery Wastewater by Double-Wavelength Coefficient Compensate Ultraviolet Spectrophotometry

In this paper,the method of determination of phenol and aniline in refinery wastewater by double-wavelength coefficient compensate ultraviolet spectrophotometry was proposed. Using this method , disturbance matter was dispelled by double-wavelength principle and sensitivity was as high as single-wavelength method. At pH=11.4,the phenol and aniline are determined respectively at 224 nm/234 nm and 240 nm/228 nm. In this method,the pretreatment steps such as extraction,distillation,color develop are not needed,the sample is directly determined,the operation is simple,convenient,sensitive,accurate and fast. This method is compared with double-wavelength method without using coefficient compensate,the sensitivity of phenol increased 4.0 times and sensitivity of aniline increased 11.1 times.The synthetic samples were determined by the method,the relative error of phenol is less than ±3.5%,the relative standard deviation of phenol is less than 2.8%,the relative error of aniline is less than ±4.0%,the relative standard deviation of aniline is less than 3.3%. The wastewater samples in refinery were determined by the method, the rates of recovery of phenol and aniline are 96.0%～104.0% and 97.3%～103.5% respectively,the results are satisfactory.