Improvement of detection method for anionic synthetic detergents in drinking water / 公共卫生与预防医学

ABSTRACT

Objective To detect anionic synthetic detergents in drinking water with dichloromethane as the extracting agent using an automatic anionic detergent online extraction analysis system. Methods Anionic synthetic detergent in water reacted with methylene blue dye to produce blue compounds. Dichloromethane was used instead of chloroform for extraction. The automatic anionic detergent on-line extraction and analysis system was used for color comparison and quantification. Results The linear relationship of the anionic synthetic detergents was good in the range of 0 mg /L～0.50 mg /L with a correlation coefficient being greater than 0.9990. The relative standard deviation was 1.08%～4.63%, the recovery was 93.76%～106.64%, and the method detection limit was 0.004 mg /L. Conclusion This method used dichloromethane as an extractant to determine anionic synthetic detergents in drinking water, and obtained satisfactory results. At the same time, full automation kept the detection environmental conditions of different samples consistent, saved labor and further improved the safety of operators.