On simultaneous determination of phenol aniline and benzoic acid by ultraviolet absorption spectrometry

The present paper introduces the authors' analysis and study of the simultaneous determination of the content of phenol, aniline and benzoic acid in the mixed solution by following the additive character's principle of the Ultraviolet Absorption Spectrometry's absorbance. By adjusting the pH value of the solution, the absorption peak of Ultraviolet Absorption Spectrometry may appear from the red shift(or blue shift), which is useful to choose the optimal absorption wavelength. The experimental results show that the absorbance additive feature of phenol, aniline and benzoic acid could be used to determine the content simultaneously in the alkaline medium with satisfactory results while the relative error is 10%15%. When the linear ranges of calibration curves were 070 mg/L for phenol, aniline and benzoic acid, the recoveries of standard would be 95.8%107.8%, 97.6%117% and 93.7%108.5%, respec- tively, and also the relative standard deviations would be 1.84%, 3.20%, 2.71%,1.06% and 2.61%,5.10% for the two groups of wastewater respectively.