Research on the Detection Method of Emulsified Oil in Condensed Water

摘要

Emulsified oil is one of the main pollutants in condensed water. At present, the difficulties in demulsification of emulsified oil and dephenolization of petroleum ether are the main challenges in quantitative determination of emulsified oil in water by UV spectrophotometry. In this paper, second derivative ultraviolet spectrophotometry and demulsification with NaCl and ultrasonic were adopted to eliminate the disturbance of petroleum ether and avoid dephenolization process. Results show that the linear range of the standard oil is from 0 to 30 mg/L, the recovery lies between 90.4%-101.6%, the relative errors are no more than 3%, the coefficient of variation are no more than 1.4%, and the repeatability standard deviation is only 0.1366. These results indicate that the emulsified oil detection method established has such advantages as high sensitivity, little interference, simple determination procedure, and accurate and reliable measuring result.