Automatic Sonic Assistance Liquid Liquid Spray Extraction Technique And Application

Liquid liquid extraction is a old and well established traditional technique in water sample pretreatment, while it has some shortcoming such as the time consuming, large consumption of organic solvent and difficult to realize automation. In particular, the technique is very tedious for large volume (over 10 L) water samples. The problems were completely resolved in this study by novel sonic assistance liquid liquid spray extraction technique with automatic process. The liquid phase water sample was continuously injected into extracting organic solvent by spray pumping. The number of micro water and micro organic solvent were produced in the mixing extractor under the liquid spray and sonic assistance conditions. It is greatly increased extraction efficiency within short extraction time due to increasing both of interaction surface area and collision probability between water and organic solvent. The major parameters affecting the extraction efficiency, such as the nozzle types, the nozzle angle, the spray rate, the position of the nozzle, the assistance sonic energy, the extraction cycle times, and the sample volume were preliminary optimized. The novel technique was applied to determine trace organic pollutants from real environmental water samples and these were evaluated by comparison results with this obtained by liquid liquid extraction. The sonic assistance liquid liquid spray extraction is a simple, time saving, less solvent consumption and automatic extraction technique with high extraction efficiency and precision, and more importantly it is suitable for extraction of large volume water sample both on site and in Lab.